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  • 2010-2014
  • 2000-2004  (572)
  • Chemistry  (481)
  • Children  (91)
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  • 1
    ISSN: 1432-2277
    Keywords: Key words Liver transplantation ; Posttransplant lymphoproliferative disease ; Epstein-Barr virus ; Humans ; Children
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Epstein-Barr virus (EBV) infection can induce uncontrolled lymphocyte B proliferation in immunosuppressed transplant patients. Monitoring circulating EBV-infected lymphocytes can help in identifying patients at risk of posttransplant lymphoproliferative disease (PTLD). Circulating EBV genome levels were determined in 54 liver transplant pediatric recipients. Ten patients had more than 500 EBV genome/105 peripheral blood lymphocytes (PBL) and exhibited clinical manifestations of EBV infection; three developed PTLD. To treat EBV infection, the level of immunosuppression was reduced and acute rejection developed in 4 patients. Three were treated with steroid and one had to be switched from cyclosporine to tacrolimus. Treatment of acute rejection was associated with increases in circulating EBV genome. None of the patients with less than 500 EBV genome/105 PBL developed PTLD or EBV infection. Monitoring of EBV DNA is useful in the management of EBV infection and PTLD following pediatric liver transplantation. EBV infection should be treated in ways which do not expose patients to the risk of rejection.
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  • 2
    ISSN: 1432-2161
    Keywords: Key words Bone mineral density ; Dual energy X-ray absorptiometry ; Children ; Rickets ; X-linked hypophosphatemia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Objective. To evaluate the bone mineral status of children being treated for X-linked hypophosphatemia, including potential differences between cortical bone in the radial diaphysis and combined cortical and trabecular bone in the lumbar spine. Design and patients. Forty-four bone mineral evaluations were performed in 11 children and adolescents with X-linked hypophosphatemia. Bone mineral density (BMD) of the lumbar spine and the radial diaphysis were measured by dual X-ray absorptiometry (DXA), second metacarpal cortical thickness was measured on hand radiographs, and these results were expressed as Z-scores (standard deviations from the mean). Results. For the 11 initial examinations, Z-scores (mean±SD) were: radial BMD, –2.73±1.15, lumbar BMD, +1.28±1.53; and cortical thickness, –2.21±0.95. Lumbar BMD Z-scores were significantly greater than those for radial BMD and cortical thickness. On follow-up examinations there was a mild increase in radial BMD and decrease in lumbar BMD. Although these changes were statistically significant, they were quite small and the discordance between radial and lumbar BMD was not corrected. Conclusions. Children and adolescents who are being treated for X-linked hypophosphatemia manifest a bone mineral disorder characterized by decreased BMD in the appendicular skeleton and increased BMD in the lumbar spine. Although current therapy is successful in its anti-rachitic effects, it does not correct this bone mineral disorder and additional therapeutic trials should be considered.
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  • 3
    ISSN: 1432-2129
    Keywords: Schlüsselwörter ; Kopfschmerz ; Kinder ; Akuttherapie ; Flupirtin ; Paracetamol ; Keywords ; Children ; Acute treatment ; Tension-type headache ; Flupirtine ; Paracetamol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract Background: About 10% of all schoolchil- dren are suffering from migraine and 50% from tension-type headache. Headache of acute onset usually will be treated with analgesic substances like paracetamol, acetylsalicylic acid or ibuprofen, the first one being the reference drug for tension-type headache in childhood. In case of lacking improvement or side-effects there is demand for an alternative safe substance for the acute analgesic therapy. Methods: In a double-blind randomised investigation flupirtine and paracetamol were given in two consecutive attacks of episodic tension-type headache. 30 children, 6–12 years old, were included. Dosage was determined according to age and weight. The children documented the acute headache intensity and duration in a special diary. Results: Headache intensity was reduced during 2 h after intake in 89% of the 19 children treated. The reduction was 6,5 to 3,1 for flupirtine and 6,9 to 3,3/10 for paracetamol. There was no statistically significant difference between the two substances. Relevant side-effects could not be observed. Conclusion: Flupirtine has shown a convincing clinical effect treating acute episodic tension-type headache for children. The substance was well tolerated by the patients. In addition, flupirtine provides a high degree of safety.
    Notes: Zusammenfassung Hintergrund: Etwa 10% aller Schulkinder leiden nach neueren deutschen epidemiologischen Untersuchungen zumindest gelegentlich an Migräne und etwa 50% an Kopfschmerzen vom Spannungstyp. Häufig nehmen sie bei Spannungskopfschmerzen analgetische Monosubstanzen wie Paracetamol, Azetylsalizylsäure oder Ibuprofen ein. Bei nicht ausreichender Wirkung bzw. Unverträglichkeit besteht Bedarf nach weiteren Substanzen für die Akutanwendung. Methode: In einer doppelblindrandomisierten und gekreuzten Anordnung wurden Paracetamol bzw. das analgetisch und muskelrelaxierend wirksame Flupirtin 30 6- bis 12jährigen Kindern für 2 episodische Spannungskopfschmerzattacken angeboten. 10 Kinder benötigten nach dem Erstkontakt keine Medikation mehr, 1 Kind lehnte die Einnahme grundsätzlich ab. Ergebnisse: Die Kopfschmerzstärke verringerte sich laut Kopfschmerztagebuch innerhalb von 2 h nach der Einnahme auf einer numerischen Schmerzskala (0–10) von 6,5 auf 3,1 unter Flupirtin und von 6,9 auf 3,3 unter Paracetamol bei 89% der verbliebenen 19 Kinder. Statistisch signifikante Unterschiede zwischen beiden Substanzen bestanden nicht. Als Nebenwirkung trat 1-mal Erbrechen unter Paracetamol auf. Schlussfolgerung: Flupirtin hat sich in der Akutphase von episodischen Spannungskopfschmerzen beim Kind bewährt. Es verfügt über eine gute Verträglichkeit. Im Vergleich zu Paracetamol scheint v.a. bei akzidenteller Überdosierung eine größere Sicherheit zu bestehen.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Der Schmerz 14 (2000), S. 302-308 
    ISSN: 1432-2129
    Keywords: Schlüsselwörter Schmerzmessung ; Diagnostik ; Instrumente ; Neugeborene ; Kinder ; Keywords Pain ; Measurement ; Assessment ; Instruments ; Neonates ; Children
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract Background. The assessment and measurement of pain is essential in the implementation and control of pain relieving strategies. The measurement of pain in infants and children should be based on the consideration of age, cognitive level, psychological status, intercurrent diseases and the social context in order to register the child's individual situation and to avoid misinterpretation. Diagnosis. In the preverbal infant, behavioral and physiological cues have to be interpreted by the caregivers. For the assessment of pain in children of four and older who have at least a basic understanding of the pain concept self assessment methods (as rating scales, specific pain interviews, diaries and questionnaires) can be used. In any case the instruments used should be age appropriate. The instruments used for the different age groups are presented with comments on quality and clinical applicability.
    Notes: Zusammenfassung Hintergrund. Voraussetzung zur Durchführung und Kontrolle einer adäquaten und effektiven Schmerztherapie sind die Erfassung und Quantifizierung des Schmerzes in seinen verschiedenen Dimensionen. Bei der Diagnostik des Schmerzes im Kindesalter müssen Alter, kognitiver Entwicklungsstand, psychologischer Status, interkurrierende Erkrankungen und der soziale Kontext berücksichtigt werden, um das Kind in seiner individuellen Situation erfassen zu können und Fehleinschätzungen zu vermeiden. Schmerzdiagnostik im Kindesalter. Im präverbalen Alter werden die physiologischen und verhaltensbezogenen Schmerzäußerungen von Neugeborenen, Säuglingen und Kleinkindern durch eine Fremdbeurteilung erfasst. Bei Kindern ab etwa 4 Jahren, die über ein einfaches Verständnis von Schmerz verfügen, sind Verfahren der Selbsteinschätzung wie einfache Ratingskalen, spezifische Schmerzinterviews, Tagebücher und Fragebögen die primär einzusetzenden Instrumente. In jedem Fall sollten die Instrumente altersgerecht gestaltet sein. Für die verschiedenen Altersgruppen werden Instrumente der Schmerzerfassung mit qualitativen Hinweisen auf deren Güte und klinische Anwendbarkeit vorgestellt.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Der Schmerz 14 (2000), S. 319-323 
    ISSN: 1432-2129
    Keywords: Schlüsselwörter Schmerz ; Kinder ; Impfung ; Verbrennung ; Injektion ; Keywords Pain ; Children ; Vaccination ; Burn ; Injection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract Phenomenon pain. While pain is one of the main reasons for an unscheduled visit to the paediatrician, pain due to painful procedures is of major importance in scheduled visits. Actual pain therapy is illustrated in the treatment of burns. Incomplete analgesia may have an unfavourable impact on morbidity and mortality. The pain score does not correlate with the extent of the burned area, and is regularly underestimated. General anaesthesia or analgo-sedation are warranted during the care of the burned patient. Unsufficient analgesia. Consequence of insufficient analgesia during primary care is an increased need of analgesics, and an increased pain treatment failure rate during subsequent procedures. Pain is interfering with anxiety, sleep disturbancies and post-tramatic psychologic alterations. All those symptoms must be treated adequately. Acute illness and injections. This article covers pain from otitis media, pharyngitis, Guillain-Barré syndrome, purpura fulminans, Toxic Epidermal Nekrolysis, as well as the usage of local anaesthesia during injections, not to forget the application of non-pharmacologic methods for pain therapy and prophylaxis.
    Notes: Zusammenfassung Phänomen Schmerz. Das Phänomen “Schmerz” begleitet fast alltäglich den Kontakt zwischen Arzt und krankem Kind. Auf der einen Seite sind Schmerzen der häufigste Grund für eine ungeplante Kinderarztkonsultation, auf der anderen Seite sind bei geplanten Kinderarztbesuchen häufig schmerzhafte Prozeduren durchzuführen. Anhand der starken Schmerzen bei den im Kleinkindalter häufigen Verbrennungen werden schmerztherapeutische Prinzipien konkretisiert: Schmerztherapeutische Prinzipien. Unzureichende Analgesie kann Morbidität und Mortalität ungünstig beeinflussen. Das Schmerzmaß korreliert nicht mit der Ausdehnung der Verbrennung und wird vom Behandler regelmäßig unterschätzt. In vielen Fällen der Erstversorgung sind Allgemeinanästhesie oder Analgosedierung gerechtfertigt, ähnliches gilt für den Verbandwechsel. Ungenügende Analgesie bei der Erstversorgung führt zu erhöhtem Analgetikaverbrauch und schmerztherapeutischen Misserfolgen bei Folgeeingriffen. Wechselwirkungen zwischen Schmerzen und anderen Symptomen wie Angst, Schlafstörungen oder postraumatischen psychischen Veränderungen sind zu beachten und adäquat zu therapieren. Akute Erkrankungen + Injektionen. Weiter wird auf Schmerzen bei Otitis media, Pharyngitis, Guillain-Barré-Syndrom, Purpura Fulminans und Toxischer Epidermaler Nekrolyse sowie den Einsatz von Lokalanästhetika bei Injektionen eingegangen. Schließlich haben auch nicht pharmakologische Methoden ihren Platz in Schmerztherapie und Prophylaxe.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Der Schmerz 14 (2000), S. 333-339 
    ISSN: 1432-2129
    Keywords: Schlüsselwörter Postoperative Schmerztherapie ; Schmerz ; Kinder ; Jugendliche ; Analgetika ; Keywords Postoperative pain therapy ; Pain ; Children ; Adolescents ; Analgesics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract Treatment of pain. Undertreatment of postoperative pain in children is a problem in clinical practice. This is due to a lack of both knowledge about age-specific aspects of physiology and pharmacology, and routine pain assessment. For example, the fear of side-effects prevents the adequate usage of opioids. It is of major importance to select a route of drug administration where the child feels comfortable with (avoid intramuscular injections). Non-opioid analgesics. Non-opioid analgesics are recommended for basic pain treatment after minor surgical procedures. Instead of using the whole multitude of drugs available, the doctor should stick to those drugs he is familiar with (acetaminophen, ibuprofen, diclofenac, dipyrone). Opioids. Opioid usage requires individual dose titration and careful monitoring of side-effects (respiratory monitoring, sedation score). The strong opioids piritramide and morphine may advantageously be administered as either continuous, or patient-controlled iv- infusion (PCA). Forms of therapy. In addition to infiltration anesthesia, intraoperatively applied nerve blocks provide excellent pain relief. Epidural analgesia with local anesthetics and/or opioids via a thoracic or lumbar epidural catheter is a therapeutic option after thoracic or abdominal surgery, or after extensive orthopedic or urological interventions. Adjuvant analgesics and nonpharmacologic interventions, i. e. transcutaneous electrical nerve stimulation (TENS), are primarily indicated in patients suffering from neuropathic pain. Conclusion. The establishment of pain services and the comprehensive education of both the nursing and the medical staff should help to improve postoperative pediatric pain therapy.
    Notes: Zusammenfassung Schmerztherapie bei Kindern. Postoperative Schmerzen bei Kindern werden häufig wegen mangelnder physiologischer und pharmakologischer Kenntnisse und des Fehlens einer regelmäßigen standardisierten Schmerzmessung noch immer unzureichend behandelt. Die Angst vor Nebenwirkungen verhindert eine adäquate Opioidtherapie. Bei der Verwendung von Analgetika ist auf eine kindgerechte Applikationsweise (keine i.-m.-Injektionen!) zu achten. Nichtopioidhaltige Analgetika. Nichtopioidhaltige Analgetika (Parazetamol, Ibuprofen, Diclofenac, Metamizol) sind zur Basisschmerztherapie bei kleineren schmerzhaften Eingriffen geeignet. Opioide. Opioide müssen nach Wirkung titriert werden; Nebenwirkungen können nur bei sorgfältigem Monitoring von Atmung und Sedierungsgrad frühzeitig erkannt werden. Opioide (Tramadol, Piritramid, Morphin) können entweder kontinuierlich i. v. oder mittels PCA-Pumpe verabreicht werden. Therapieformen. Neben der Oberflächenanästhesie sind intraoperativ angelegte Nervenblockaden effektive therapeutische Möglichkeiten. Eine lumbale und thorakale Periduralanästhesie mittels Lokalanästhetika und/oder Opioiden bietet sich bei thorakoabdominalen Eingriffen an. Koanalgetika werden vornehmlich bei Nervenschmerzen verwendet und richten sich gegen die schmerzverursachende Pathophysiologie. Optimierung der Schmerztherapie. Die postoperative Schmerztherapie bei Kindern kann durch Einrichtung eines Akutschmerzdiensts und kontinuierliche Weiterbildung von Pflegepersonal und Ärzten optimiert werden.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Pediatric nephrology 14 (2000), S. 1016-1021 
    ISSN: 1432-198X
    Keywords: Key words Nephrocalcinosis ; Sonography ; Renal function ; Body growth ; Children
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  We carried out a retrospective survey on 152 children and adolescents with nephrocalcinosis (NC) in 22 German centers of pediatric nephrology. Etiology, clinical manifestations, growth and development, sonographic appearance of NC and renal function were analyzed. The median age at the time of diagnosis was 3.3 (range 0.1–21) years and the median duration of follow-up was 4.1 years. In 34% of children NC was associated with idiopathic hypercalciuria (IHC) and in 32% with various hereditary tubular disorders. In 9% NC was observed subsequent to prophylactic bolus administration of vitamin D in infancy. A positive family history was found in 36%. Clinical manifestations were mainly failure to thrive during the 1st year of life (46%), psychomotor/mental retardation (28%) and urinary tract infection (34%). In 14% nephrolithiasis was associated. During the follow-up the proportion of patients with the most severe degree of NC (stages 2b or 3) increased from 40% to 55% and that of hypercalciuria decreased from 79% to 52%. Body height was 〈2 standard deviation scores (SDS) of normal in 41% at the time of diagnosis and in 32% at the last observation; the increase in relative height was significant only for IHC. Glomerular filtration rate (GFR) and urinary concentration capacity changed only slightly with time. At the last investigation GFR was 〈50 ml/min/1.73 m2 in 6% and concentration capacity 〈800 mosmol/kg in 48% of patients. The degree of NC was negatively correlated with GFR and concentration capacity.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Pediatric nephrology 15 (2000), S. 302-316 
    ISSN: 1432-198X
    Keywords: Key words Calcium channel blockers ; Children ; Pharmacokinetics ; Hypertension
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  The calcium channel blockers (CCBs) are a diverse group of antihypertensive medications with variable pharmacokinetics and clinical effects. Although CCBs have been widely applied to the treatment of hypertensive children, data regarding the pharmacokinetics, efficacy and safety of these agents in children are extremely limited. In this review we briefly summarize the mechanism of action of CCBs and then summarize pertinent pharmacokinetic information on each of the CCBs commonly used in children, including amlodipine, diltiazem, felodipine, isradipine, intravenous nicardipine, nifedipine and verapamil. Clinically important drug interactions and adverse effects are discussed, as well as the potential role of CCBs in renal protection. Available pediatric efficacy and safety data are summarized, and recommendations made regarding the rational use of CCBs in the management of pediatric hypertension.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Pediatric nephrology 15 (2000), S. 57-59 
    ISSN: 1432-198X
    Keywords: Keywords X-linked hypophosphatemia ; Dipyridamole ; Children
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  X-linked hypophosphatemia (XLH) is characterized clinically by rickets, hypophosphatemia and hyperphosphaturia. Conventional treatment of XLH with oral phosphate and vitamin D is associated with hypercalcuria and nephrocalcinosis. Recently, intravenous and oral dipyridamole has been reported to decrease fractional excretion of phosphate in adults with idiopathic hyperphosphaturia. Our objective was to determine whether oral dipyridamole therapy reduces urinary phosphate excretion and increases serum phosphate concentration in children with XLH. A prospective study was performed in six children with XLH. The average age of the patients at the start of the study was 12.5±1.0 years. The effects of 12 weeks of oral dipyridamole therapy, at 4.4±0.4 mg/kg body weight per day, on serum phosphorous, parathyroid hormone (PTH), 1,25 (OH)2 vitamin D, osteocalcin, tubular maximum for phosphate reabsorption (TmP/GFR), urinary calcium excretion, and cyclic adenosine 3’,5’-monophosphate (cAMP) excretion, were compared to baseline levels. Our results show that there was no change in serum phosphorous concentration or TmP/GFR after 12 weeks of dipyridamole therapy. Dipyridamole therapy also had no effect on serum PTH, serum 1,25 (OH)2 vitamin D, alkaline phosphatase, osteocalcin levels, urinary calcium or cAMP excretion. We therefore concluded that in children with XLH, a 12-week course of dipyridamole had no effect on serum phosphorous or its urinary excretion. Dipyridamole therapy is unlikely to improve the bone disease in children with XLH.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Pediatric nephrology 15 (2000), S. 248-251 
    ISSN: 1432-198X
    Keywords: Key words Nephrotic syndrome ; Acute renal failure ; Children ; Peritonitis ; Ischemic tubular necrosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Idiopathic acute renal failure (IARF) is an uncommon but severe complication in children with relapsing nephrotic syndrome and may require long-term dialytic support until recovery of renal function takes place. Due to limited understanding of the pathophysiology of IARF, specific guidelines for its prevention and therapy have not been developed. Among triggering factors, peritonitis was present in half of all pediatric patients with this complication described in the English literature over the past 15 years. We report an additional nephrotic child who developed IARF following spontaneous bacterial peritonitis. The renal biopsy showed tubular epithelial changes consistent with acute tubular necrosis. A discussion of related literature and possible pathogenesis of this association is presented.
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  • 11
    ISSN: 1433-0350
    Keywords: Key words Child abuse ; Shaken baby syndrome ; Brain injury ; Infants ; Children ; Neuroimaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Acute CT/MRI findings were examined in a prospective, longitudinal study of 60 children 0–6 years of age hospitalized for moderate to severe traumatic brain injury (TBI). TBI was categorized as either inflicted (n=31) or noninflicted (n=29). Glasgow Coma Scale scores and perinatal history were comparable in both groups. Acute CT/MRI studies were visually inspected by a radiologist blind to group membership. Compared with the noninflicted TBI group, the inflicted TBI group had significantly elevated rates of subdural interhemispheric and convexity hemorrhages as well as signs of pre-existing brain abnormality, including cerebral atrophy, subdural hygroma, and ex vacuo ventriculomegaly. Intraparenchymal hemorrhage, shear injury, and skull fractures were more frequent after noninflicted TBI. Subarachnoid hemorrhage and infarct/edema occurred with comparable frequency in both groups. Characteristic acute neuroimaging findings of inflicted TBI included multiple extraaxial hemorrhages in addition to the mild atrophy, subdural hygromas, and ventriculomegaly that suggest prior brain abnormality.
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  • 12
    ISSN: 1433-0350
    Keywords: Key words Brain death ; Children ; Electroencephalogram ; Etiology ; Evoked potentials ; Radioisotopic angiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  The objective of this study was to determine the main clinical, neurophysiological and angiographic findings in brain death (BD) in children seen at the Instituto Nacional de Pediatría, a third-level facility in Mexico City, between 1991 and 1996. The following variables were retrospectively analyzed: sex, age, etiology, associated morbidity, duration of stay in hospital, and the results of two of three confirmatory studies (electroencephalogram, evoked potentials, radioisotopic angiography). In all, 125 patients were studied [78 male; median age 2 years (range: 18 days to 17 years)]. The most frequent etiology was infection (34%); 57% of the children developed associated morbidity. In 111 of 122 patients electrocerebral silence was observed; 100 of 107 had brain stem and somatosensory evoked potentials affording conclusive evidence of BD; and 83 of 90 patients had a positive radioisotopic angiography indicating BD. In 76 patients all three confirmatory studies were performed: for 15 there was at least one false-negative test result. Our age cohort showed a predominance of children less than 2 years old. BD etiologies in developing countries differ from those reported in developed countries.
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  • 13
    Electronic Resource
    Electronic Resource
    Springer
    Child's nervous system 16 (2000), S. 755-759 
    ISSN: 1433-0350
    Keywords: Keywords Head trauma ; Children ; CT scan ; MRI scan ; Follow-up
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  CT scanning is the current first imaging technique to be used after head injury, in those settings where a CT scan is available. The first scan is usually done without contrast enhancement. The value of CT is the demonstration of scalp, bone, extra-axial hematomas and parenchymal injury. It is rapid and easily done in the presence of the multiple monitors that many trauma patients have in place. It can be used to demonstrate the bony anatomy of the spine and is good for evaluation of abdominal and chest trauma also. MRI is more sensitive for all post-traumatic lesions other than skull fracture and subarachnoid hemorrhage, and can demonstrate parenchymal spinal cord injury. The cons are a longer scanning time, interference of the imaging by certain ICP monitors and problems with the positions of the monitoring equipment and ventilators outside the MRI magnetic field. MRI will be used increasingly to study early head injury because of its ability to measure cerebral blood flow, cerebral blood volume and the location and extent of cerebral edema. If the CT does not demonstrate pathology adequate to account for the clinical state, MRI is warranted. Follow up is best done with MRI as it is more sensitive to parenchymal change than is CT.
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  • 14
    ISSN: 1433-044X
    Keywords: Schlüsselwörter Thoraxtrauma ; Atelektasen ; Pädiatrie ; Bauchlage ; Keywords Thoracic trauma ; Atelectasis ; Children ; Prone position
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract We report on the ventilation in prone position in a 5-year-old traumatized child with severe thoracic and abdominal injuries (lung contusion, rib fractures, rupture of liver and spleen). Under continuous analgosedation, the young patient was ventilated in prone position for 6 h, since acute lung injury and atelectasis persisted despite various therapeutic measures (artifical ventilation in the pressure controlled mode, fiberoptic bronchoscopy, reexpansion maneuver). After initiation of the prone position, we observed a rapid increase i narterial oxygenation, which persisted in the following period. The hemodynamic situation remained stable. The complete disappearance of atelectasis was demonstrated radiologically after supine repositioning. After cessation of analgosedation, the extubation was performed 2 days later. Furthermore, we found no side effects of the prone position on the injured abdomen, and the liver function improved rapidly. Although there is a lack of experience with ventilation in prone position in pediatric intensive care, our report might be a recommendation for the indication of this technique in children.
    Notes: Zusammenfassung In dieser Kasuistik wird über die erfolgreiche Anwendung der Beatmung in Bauchlage bei einem 5-jährigen Mädchen berichtet, welches von einem Pkw überrollt worden war und sich Thorax- und Abdominalverletzungen (Rippenserienfraktur, Lungenkontusion, Leber- und Milzeinrisse) zugezogen hatte. Wegen des akuten Lungenversagens mit persistierenden Atelektasen, die durch wiederholte fiberoptische Bronchiallavagen und durch Reexpansionsmanöver nicht zu beheben waren, wurde der Entschluss zur 6-stündigen Lagerung auf den Bauch gefasst, obwohl über den Effekt dieser Lagerungsmaßnahme bei traumatisierten Kindern wenig bekannt ist und zu möglichen negativen Auswirkungen auf das schwerverletzte Abdomen eine Informationen vorliegen. Die Beatmung in Bauchlage führte zur raschen Verbesserung des pulmonalen Gesaustausches, die hämodynamische Situation wurde nicht beeinflusst. Die radiologische Kontrolle nach Rücklagerung zeigte eine vollständigen Rückgang der Atelektasen; die kleine Patientin konnte bald darauf extubiert werden. Weder laborchemisch noch klinisch wurde ein schädigender Einfluss auf das verletzte Abdomen gefunden. Die Beatmung in Bauchlage hat sich als Routineverfahren bei der Behandlung des Lungenversagens des Erwachsenen etabliert; nach der hier beschriebenen Erfahrung ist diese Maßnahme auch bei traumatisierten Kindern in Betracht zu ziehen, insbesondere wenn andere Maßnahmen nicht ausreichend sind.
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  • 15
    ISSN: 1433-0458
    Keywords: Schlüsselwörter Cochlear Implant ; Ambulante Rehabilitation ; Kinder ; Erwachsene ; Ergebnisse ; Keywords Cochlear implant ; Outpatient rehabilitation ; Cost effectiveness ; Results ; Children ; Adults
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract Background and objective. This study compares the results of the outpatient-based program of the Cochlear Implant Center Ruhr with inpatient-based rehabilitation, which is almost exclusively performed in Germany. Patients/methods. The Department of Otorhinolaryngology at the University of Essen in Germany provided 52 patients with either 22- or 24-channel Nucleus cochlear implants from March 1996 to July 1999. Almost all patients (n=49) were rehabilitated on an outpatient basis, which is the standard in many cochlear implant centers outside Germany. Results. The longest follow-up period at the University of Essen Department of Otorhinolaryngology was 36 months. Minor complications occurred in 10% of the patients. After 24 months, the first three implanted patients were able to discriminate 100% of numbers and over 60% of syllables in the Freiburg speech discrimination test. The patients who developed an understanding of open speech were able to discriminate 31 words per minute with cochlear implant and without lipreading after 24 months. Children were seen to double their Schmid-Giovannini scores at 6 months postimplantation. Conclusions. The Essen outpatient-based cochlear implant program demonstrates results in speech development and speech understanding equal to those of centers providing inpatient rehabilitation. A special advantage is continuous rehabilitation with professionals known to the child for several years. In children especially, exhaustive commuting reduces school attendance and is a burden on the accompanying guardians. As an inpatient, however, the child is torn from his familiar environment. Parents with several children have particular difficulties in accompanying their child and indeed this may not always be possible.
    Notes: Zusammenfassung Hintergrund und Fragestellung. In dieser Arbeit werden die Ergebnisse der ambulanten Rehabilitation nach Cochlear-Implant-Versorgung mit denen der stationären Rehabilitation verglichen, die bisher in Deutschland fast ausschließlich durchgeführt wird. Von März 1996 bis Juli 1999 wurden an der Universitäts-Hals-Nasen-Ohren-Klinik Essen 52 taube oder an Taubheit grenzende Patienten mit einem 22-kanaligen bzw. 24-kanaligen Nucleuscochlear-Implant versorgt. Fast alle Patienten (n=49) konnten wohnortnah ambulant rehabilitiert werden, wie dies dem internationalen Standard entspricht. Ergebnisse. Der längste bisherige Nachbeobachtungszeitraum an der Universitäts-Hals-Nasen-Ohren-Klinik Essen sind 36 Monate. Nach 2 Jahren wurden von den 3 am längsten nachbeobachteten Patienten 100% der Zahlen und über 60% der Einsilber im Freiburger Sprachtest verstanden. Im “speech tracking” erreichten Patienten mit CI und ohne Lippenabsehen nach 24 Monaten 31 Wörter/min. Die Kinder zeigten 6 Monate nach Implantation eine Verdopplung des Scores im Test nach Schmid-Giovannini. Schlussfolgerungen. Das Essener Modell zeigt, dass eine ambulante Rehabilitation nach CI zu vergleichbaren Ergebnissen in der Sprachentwicklung und im Sprachverstehen führt, wie sie von anderen Zentren vorgelegt wurden, in denen fast ausschließlich stationär rehabilitiert wird. Besonders bei Kindern bedeuten lange Anfahrtswege mit einwöchigem stätionärem Aufenthalt Schulausfälle und eine Belastung für die begleitenden Eltern und Familienangehörigen zu Hause, sowie erhebliche Fahrtkosten. Stationäre Aufenthalte zur Rehabilitation reißen zudem das Kind aus seiner gewohnten Umgebung und sind für Eltern mit mehreren Kindern oft unmöglich.
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  • 16
    ISSN: 1433-0458
    Keywords: Schlüsselwörter Hörstörung ; Prävalenz ; Konnatale Hörstörungen ; Erworbene Hörstörungen ; Progredienz ; Infektionen ; Kinder ; Keywords Hearing loss ; Prevalence ; Connatal hearing loss ; Acquired hearing loss ; Progressive hearing loss ; Infections ; Children
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract The results of international investigations on connatally acquired hearing loss are compared with the data of the German Registry on Childhood Hearing Loss (4058 cases). The connatal hearing disorders have shown a notable change in the last years regarding to aetiology and prevalence. In contrast to countries of the third world in developed nations the prevalence of permanent childhood hearing loss has been reduced down to 1 in 1.000 births. The results let assume a prevalence of approximately 1:1.200 births in Germany. For instance the number of rubella embryopathia decreased effectively. In contrast CMV infections and alcohol fetopathia are playing an increasing role. In the patients of the German Registry on Childhood Hearing Loss the percentage of certainly progressive hearing loss is 10.3 within the 4058 children with permanent hearing impairment. Diagnostic procedures first of all for the early diagnosis of CMV but also of toxoplasmosis are considerable because these infections may result in treatable hearing loss. Also consequent hearing tests are demanded in children with alcohol fetopathia.
    Notes: Zusammenfassung Im vorliegenden Beitrag werden die Daten internationaler Studien zu angeborenen erworbenen Hörstörungen mit den Ergebnissen aus 4058 Fällen im Deutschen Zentralregister für kindliche Hörstörungen (DZH) verglichen und ausgewertet. Die angeborenen Erkrankungen des Hörvermögens haben innerhalb der letzten Jahre bezüglich Ätiologie und Prävalenz einen deutlichen Wandel erlebt. Im Gegensatz zu Ländern der 3. Welt ist die Prävalenz permanenter kindlicher Hörstörungen in den westlichen Industrienationen auf ca. 1:1.000 gesunken. In Deutschland liegt die Prävalenz nach ersten Ergebnissen des DZH bei ca. 1,2:1.000. So ist beispielsweise der Anteil der Rötelnembryopathien stark zurückgegangen. Dagegen spielen heute die Zytomegalievirus-(CMV)-Infektion und die Alkoholfetopathie eine größere Rolle. Im Patientenkollektiv des DZH mit 4058 permanent hörgestörten Kindern beträgt der Anteil gesichert progredienter Verläufe 10,3%. Diagnostische Verfahren, vor allem zur Früherkennung von CMV und Toxoplasmose, gewinnen zunehmend an Bedeutung. Ebenso ist eine konsequente Hördiagnostik auch bei Kindern mit Alkoholfetopathie zu fordern.
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  • 17
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    Der Anaesthesist 49 (2000), S. 275-278 
    ISSN: 1432-055X
    Keywords: Schlüsselwörter Tropisetron ; postoperatives Erbrechen ; Adenotonsillektomie ; Antiemetika ; Kinder ; Key words Tropisetron ; PONV ; Adenotonsillectomy ; Antiemetics ; Children
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract Background: Postoperative nausea and vomiting (PONV) after tonsillectomy is a common problem in children. Tropisetron is a new 5HT3 receptor antagonist and is successfully used in paediatric patients receiving cancer therapy. The aim of the study was to assess efficacy and safety of a single intravenous dose of tropisetron for prevention of PONV in paediatric patients at risk for postoperative vomiting. Methods: In a randomised, double-blind, placebo-controlled trial, we studied 98 children aged 2–12 years undergoing tonsillectomy or adenotonsillectomy. Patients received placebo or tropisetron 0.1 mg (=0.1 ml)/kg body weight immediately after induction of anesthesia. A standard general anesthetic technique (Sevoflurane/N2O/O2 without neuromuscular blockers or opioids) was used. Perioperative vital signs, grade of sedation and episodes of postoperative nausea and vomiting were recorded. Results: No vomiting episodes occurred in 65.3% of the tropisetron treated patients compared to 34.7% of the placebo group (p=0.0024). Only 10.2% of the tropisetron treated patients vomited more than 3 times compared to 22.4% of the control patients (p=0.0004). The need for antiemetic rescue medication was significantly lower in the study group (10.4%) compared to 28.6% (p=0.025). No significant adverse effects of the study medication were shown. Conclusion: A single intravenous prophylactic dose of tropisetron effectively reduces the incidence of PONV during the first 24 postoperative hours after tonsillectomy and/or adenoidectomy. Because of the low incidence of adverse effects, the prophylactic use of tropisetron seems to be safe and justified in paediatric surgical patients at high risk for postoperative vomiting.
    Notes: Zusammenfassung Fragestellung: Erbrechen und Übelkeit nach Tonsillektomien bei Kindern sind ein häufiges Problem. Aufgrund der positiven Erfahrungen mit Tropisetron, einem neueren 5HT3 Rezeptor-Antagonisten bei Chemotherapien in der pädiatrischen Onkologie und mit anderen 5HT3 Rezeptor-Antagonisten in der Kinderchirurgie, prüften wir die Wirksamkeit und Sicherheit einer Einzeldosis Tropisetron zur Prävention von postoperativem Erbrechen bei chirurgischen Kindern mit erhöhtem Risiko für postoperatives Erbrechen. Methodik: Bei 98 Kindern im Alter von 2– 12 Jahren, die eine Tonsillektomie oder Adenotonsillektomie benötigten, führten wir eine randomisierte, doppelblinde, plazebokontrollierte Studie durch. Die Patienten erhielten Tropisetron oder Plazebo in einer Dosis von 0,1 mg (=0,1 ml)/kg KG i.v. unmittelbar nach der Narkoseeinleitung. Die Narkose erfolgte standardisiert mit Sevofluran/N2O/O2 ohne Einsatz von Opioiden und Muskelrelaxanzien. Vitalparameter, Sedationstiefe, das Auftreten von postoperativem Erbrechen und unerwünschte Wirkungen wurden aufgezeichnet. Ergebnisse: In der Tropisetrongruppe zeigten 65,3% der Kinder kein postoperatives Erbrechen, im Gegensatz zu nur 34,7% der Kinder in der Plazebogruppe (P=0,0024). Mehr als 3 Episoden von postoperativem Erbrechen zeigten nur 10,2% der Patienten in der Tropisetrongruppe im Vergleich zu 22,4% der Patienten der Kontrollgruppe (P=0,0004). Auch der Bedarf an antiemetischer Zusatzmedikation war in der Tropisetrongruppe mit 10,4% signifikant niedriger als in der Kontrollgruppe mit 28,6% (P=0,025). Bedeutsame Nebenwirkungen der Studienmedikation konnten nicht dokumentiert werden. Schlussfolgerungen: Eine prophylaktische intravenöse Einzelgabe von Tropisetron reduziert bei Kindern wirksam das Auftreten von postoperativem Erbrechen während der ersten 24 h nach einer Tonsillektomie oder Adenotonsillektomie. Die geringe Inzidenz von Nebenwirkungen rechtfertigt unserer Ansicht nach die prophylaktische Anwendung von Tropisetron bei Kindern nach Tonsillektomien.
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  • 18
    ISSN: 1432-1076
    Keywords: Key words Coeliac disease ; Children ; Iron deficiency anaemia ; Occult blood ; AbbreviationsCD coeliac disease ; ID iron deficiency ; GFD gluten-free diet
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract It has recently been suggested that in adults with coeliac disease, faecal blood loss may play a role in the development of iron deficiency. A group of 45 children diagnosed with coeliac disease during 1996 and 1997 were therefore prospectively evaluated for the presence of gluten in their diet, iron deficiency anaemia, and faecal occult blood. Sixty children admitted for elective surgery or asthma served as controls. Faecal occult blood was found in four iron deficient children on normal diet, of whom three were newly diagnosed. Occult blood loss disappeared in three of the four children when gluten was removed from their diet. Faecal occult blood was found in 26.7% of children on gluten-containing diet, but not in children on gluten-free diet (P=0.01), or in control children (P=0.001). Conclusion Our data suggest that the incidence of occult blood loss in coeliac disease occurs mainly in newly diagnosed cases and responds to a gluten-free diet. Occult blood testing may not be warranted in the absence of iron deficiency anaemia nor in children with iron deficiency anaemia who are on a gluten-free diet.
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  • 19
    ISSN: 1432-1076
    Keywords: Key words Gentamicin ; Once daily ; Children ; Saliva
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Gentamicin is widely used in paediatric medicine and therapeutic monitoring is mandatory due to the narrow margin of safety. Saliva sampling may be of potential interest, especially in children in whom blood sampling is often difficult. Experience with once daily intravenous administration of aminoglycosides has grown in recent years. Gentamicin levels were measured in serum and saliva of 55 children treated with the drug (5 mg/kg per day), administered intravenously in three different regimens: thrice (n=19), twice (n=18), and once daily (n=18). No correlation was found between serum gentamicin concentrations and saliva levels when the drug was administered twice or thrice daily, however, there was good correlation when the drug was administered once daily (r 2=0.96, P 〈 0.0001). Conclusion In children with uncomplicated infections treated with once daily gentamicin, trough concentrations of the drug can be monitored in saliva.
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  • 20
    ISSN: 1432-1076
    Keywords: Key words Sodium cromoglycate ; Children ; Exercise-induced asthma ; Urinary eosinophil protein X excretion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract This double-blind, randomised and cross-over study was designed to compare the preventive effect against exercise-induced bronchoconstriction (EIB), defined as the percentage decrease in FEV1≥15% after 6 min of exercise, of 2 mg and 10 mg of sodium cromoglycate (SCG), administered through a metered dose inhaler via spacer, in asthmatic children. Each of the 30 subject (age 11.6 ± 3.2 years) was tested on five occasions. For inclusion, EIB in test1 was required. In tests 2 to 5, all subjects inhaled 2 mg or 10 mg of SCG 20 min and 120 min before exercise in a randomised order. In order to assess excretion of eosinophil protein X (EPX) accompanying EIB, urine samples were collected before and after exercise. The mean percentage fall in FEV1 (±SD) in test 1 was 26.8 ± 9.8%. Inhalation of 2 mg and 10 mg of SCG 20 min before exercise provided a significant preventive effect in 83% and 77% and inhalation 120 min before exercise provided a preventive effect in 63% and 70%, respectively (n=30). Variance analysis did not reveal a statistically different absolute fall in FEV1 after exercise when both doses (120 min before exercise) were compared (P=0.356). In an unselected subgroup of 12 children, urinary EPX increased after the challenge without SCG premedication (test 1) (mean change: +48.7 μg/mmol creatinine, P=0.034), whereas no significant increase was found in case of SCG premedication (mean change in μg/mmol creatinine): 2 mg/20 min: +12.1; 2 mg/120 min: +8.5; 10 mg/20 min: −10.4 and 10 mg/120 min: −23.5; P 〉 0.1). Conclusion Administration of 10 mg of sodium cromoglycate is no more effective in preventing exercise-induced bronchoconstriction than 2 mg regardless of whether the medication is given 20 or 120 min before exercise. The preventive effect of sodium cromoglycate on exercise-induced bronchoconstriction in asthmatic children is associated with the inhibition of urinary eosinophil protein X excretion.
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  • 21
    ISSN: 1432-1076
    Keywords: Key words Health-related quality of life ; Health status ; Cross-cultural adaptation ; Children ; Health Utilities Index
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Steady progress in developing effective treatments for childhood cancer and other severe pediatric diseases has established the need to consider the nature and frequency of late physical and psychological effects. The Health Utilities Index Mark 2 and Mark 3 (HUI2/3) systems were developed by Feeny, Furlong, Torrance et al. in Canada. These systems are generic multi-attribute measures of a person's health status and health-related quality of life. The first German version of the Canadian HUI2/3 questionnaire was created in our clinic, following recommended guidelines for cross-cultural adaptation of health-related quality of life measures. The usefulness of the resultant version was investigated using a sample of 142 patients who presented to our oncological outpatients' department for a routine health care visit after completion of treatment. The 15 items of the HUI2/3-questionnaire were answered independently by three groups of assessors – nurses, physicians, and parents or patients. Two additional questions covered ratings of the severity of treatment effects and the specification of these effects. The questionnaire was both easy to use and acceptable to the assessors. Percentage agreement between observers about levels for individual attributes ranged from 56% to 100%, with the lowest agreement on the subjective attributes of emotion, pain and cognition. These results are in accordance with previous studies using the original instrument. HUI2 global utility scores were significantly related to ratings of treatment sequelae, giving support to the discriminant validity of the measure. Conclusion The German version of HUI2/3 is a useful instrument with generally high inter-observer agreement and good suitability for outcome measurement in childhood cancer patients. Further research is needed to assess the usefulness of the instrument in other clinical populations and its sensitivity in longitudinal studies.
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  • 22
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    European journal of pediatrics 159 (2000), S. 515-519 
    ISSN: 1432-1076
    Keywords: Key words Osteogenesis imperfecta ; Hearing loss ; Children
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Osteogenesis imperfecta (OI) is a genetic disorder of connective tissue. Progressive hearing loss is one of the principal symptoms of OI, affecting about 50% of adult patients. Hearing loss may also occur in childhood and results in additional disability in education and psychosocial adaptation and aggravates the physical handicap. This can be avoided by appropriate otological and audiological treatment. In a nationwide search, 254 Finnish patients with OI were identified indicating a prevalence of 4.9/100 000. Of the 60 children, 45 aged between 4 and 16 years accepting to participate the study on hearing, were evaluated by a questionnaire and clinical audiometry. Hearing loss was defined as pure tone average (PTA0.5–2 kHz) more than 20 dB hearing level (HL). A clinical geneticist determined the type of OI among the 45 patients. Two sporadic OI cases with conductive hearing loss were ascertained (4.4%): An 11-year-old girl with type IV OI with a PTA0.5–2 kHz of 35/40 dB HL and a 15-year-old boy with type IV OI with a PTA0.5–2 kHz of 27/18 dB HL. In addition, a 6-year-old girl with familial OI type I had either a congenital sensorineural deafness or early progressive deafness with PTA0.5–2 kHz of 97/103 dB HL, probably of unrelated aetiology. Conclusion Hearing loss in children with osteogenesis imperfecta is less frequent than generally suspected. Nevertheless, it is recommended that audiometry is performed in children with osteogenesis imperfecta even without symptoms of hearing loss at the age of 10 years, and repeated every 3 years thereafter.
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  • 23
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    European journal of pediatrics 159 (2000), S. 430-433 
    ISSN: 1432-1076
    Keywords: Key words Alport syndrome ; Angiotensin-converting enzyme inhibitors ; Proteinuria ; Children ; AbbreviationACEi angiotensin-converting enzyme inhibitor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Enalapril, a long-acting inhibitor of angiotensin-converting enzyme, was given for 2 years to seven children with Alport syndrome. Five patients had a classical X-linked form of the disease; two siblings had the autosomal recessive variant. Their age was between 5.15 and 13.75 years when enalapril was started. All patients had haematuria and proteinuria, creatinine clearance was 〉80 ml/min per 1.73 m2 in all, and only one patient was hypertensive. The starting dose of enalapril (0.1 mg/kg body weight per day) was increased progressively according to individual clinical tolerance. The median doses were 0.13, 0.12, 0.21 and 0.29 mg/kg at 6, 12, 18 and 24 months, respectively. Median values of mean blood pressure were 95 mmHg at the start and 84 mmHg after 24 months. Median daily proteinuria decreased from 52 mg/kg to 18 mg/kg at 6 months, 21 mg/kg at 12 months, 12 mg/kg at 18 months and 30 mg/kg at 24 months. Serum creatinine increased over time from a median of 0.64 mg/dl at baseline to 0.77 mg/dl at 24 months. Concomitantly, there was a decrease in GFR from 104 to 83 ml/min per 1.73 m2 at 18 months and an increase again to 95 ml/min per 1.73 m2 at 24 months. Analysis of the individual data showed three patterns: no response (n=2), temporary response (n=2) and sustained response (n=3). Conclusion When given enalapril at the dosages mentioned, Alport patients as a group display a marked reduction in urinary protein excretion with a nadir of 23% of the baseline figure at 18 months, a decrease that cannot be accounted for by the slight decrease in glomerular filtration rate. Although these are preliminary data, it is recommended to try an angiotensin-converting enzyme inhibitor in every paediatric Alport patient with proteinuria.
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  • 24
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    European journal of pediatrics 159 (2000), S. 575-578 
    ISSN: 1432-1076
    Keywords: Key words Haemophilia ; HIV-negative patients ; Children ; Growth ; Body mass index
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract It has been shown that HIV-positive haemophilic children develop growth retardation. As not only the HIV infection but also other disease-related factors might compromise growth in these children, growth data were analysed in a longitudinal cross-sectional manner in 84 HIV-negative haemophilic patients from two university clinics. A total of 2–24 height and weight measurements (median 6) were recorded in each patient resulting in 683 single values collected between 1977–1995. Height SDS of all haemophilic boys was −0.31 ± 2.13 (mean ± SD, NS versus 0) and body mass index SDS was 0.21 ± 3.49 (mean SD, NS versus 0) at first measurement and remained unchanged throughout the observation period. Neither height nor body mass index differed with respect to the severity of haemophilia (mild/moderate/severe) or the study centre (Vienna/Prague). Conclusion Growth in HIV-negative patients with haemophilia is not affected in spite of the immunological abnormalities attributed to the substitution therapy or the bleeding episodes in the joints with the potential effect on the growth plate.
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  • 25
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    European journal of pediatrics 159 (2000), S. 649-656 
    ISSN: 1432-1076
    Keywords: Key words Antiretroviral therapy ; Children ; AIDS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The introduction of combination antiretroviral therapy has been associated with a dramatic clinical improvement in children with human immunodeficiency virus infection. However, the uptake of antiretroviral therapy has been variable across Europe. The Paediatric European Network for the Treatment of AIDS Steering Committee has performed a systematic literature review of paediatric antiretroviral therapy trials. An analysis of the evidence base for the commencement and maintenance of antiretroviral therapy was produced. Suggestions for when to commence antiretroviral therapy, which drugs to start with and how to monitor and sequence drug regimens are given. Conclusion The aim of these guidelines is to help in obtaining equity of access to a uniformly high standard of care for children with human immunodeficiency virus infection in all European countries.
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  • 26
    ISSN: 1432-1076
    Keywords: Key words Insulin aspart ; Insulin analogue ; Type 1 diabetes ; Pharmacokinetics ; Children
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The pharmacokinetics of the novel, rapid-acting insulin aspart were compared with those of soluble human insulin following subcutaneous administration in nine children (aged 6–12 years) and nine adolescents (aged 13–17 years) with stable type 1 diabetes. The study had a randomised, double-blind, two-period crossover design. Each patient received a single subcutaneous dose of insulin aspart or human insulin (0.15 IU/kg body weight) 5 min before breakfast and the plasma insulin and glucose concentrations were measured at intervals during the following 5 h. The pharmacokinetic profile of insulin aspart differed significantly from that of human insulin with a higher mean maximum serum insulin (Cmax ins), 881 ± 321 (SD) pmol/l versus 422 ± 193 pmol/l for human insulin (P 〈 0.001); and with a shorter median serum insulin t max ins, 40.0 min (interquartile range: 40–50 min) versus 75.0 min (interquartile range: 60–120 min) for human insulin, (P 〈 0.001). An age-related effect on Cmax ins and area under the curve (AUC0–5h ins) was observed with higher values in adolescents than in children for both insulin aspart and human insulin. Postprandial glycaemic control was improved with insulin aspart; the baseline-adjusted ΔCmax glu being lower for insulin aspart compared with human insulin (increase of 7.6 ± 5.1 versus 9.4 ± 4.4 mmol/l respectively, P 〈 0.05). The incidence of adverse events was similar for the two insulin types. Conclusion The more rapid onset of action of insulin aspart versus human insulin, previously observed in adults, is confirmed in a paediatric population with type 1 diabetes.
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  • 27
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    European journal of pediatrics 159 (2000), S. 507-508 
    ISSN: 1432-1076
    Keywords: Key words Behçet disease ; Children ; Myositis ; Pustulosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A 12-year-old boy presented with a limp and findings suggesting localised myositis of his right calf and a working diagnosis of Behçet disease was made. During 3 years of follow-up, he had another three episodes of calf myositis, all responsive to corticosteroids within days. Conclusion A case of recurrent localised myositis as a main manifestation of Behçet disease is reported. The evolution of incomplete Behçet disease, which is common in children, to the full blown form, with the emphasis on muscle involvement and the importance of early diagnosis of Behçet disease, is discussed.
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  • 28
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    European journal of pediatrics 159 (2000), S. 530-534 
    ISSN: 1432-1076
    Keywords: Key words Schistosomiasis ; Children ; Travellers ; Ultrasonography ; Immunodiagnosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Reports on schistosomiasis in children growing up in Europe are rare despite increased travel activity. We report on eight male and three female German children aged 50 months to 15 years with schistosomiasis. Six children were asymptomatic, whereas two presented with typical signs of Katayama fever. Persisting haematuria, headache with eosinophilia and pyelonephritis were observed in one child each. An exposure was reported for six of the children. Two were examined solely because schistosomiasis was diagnosed in a family member. All had antibodies against schistosomal antigens in at least two of three screening tests. However, schistosomal ova (Schistosoma haematobium) were detected in urine and faecal specimens from only three children. A tumour-like lesion of the bladder was found by ultrasound in only one of the children who also exhibited haematuria. Neither eosinophilia nor elevated IgE levels were constant findings. Six to 12 months after praziquantel treatment, parasitological and ultrasound checks were negative and levels of specific antibodies decreased. However, 2 years later, elevated antibody levels were detected in one girl without evidence of any new exposure. She became antibody-negative 1 year after a second course of treatment. Conclusion In contrast to residents of endemic areas, parasitological and ultrasound examinations seem to be inferior to immunodiagnostics in children from non-endemic areas at temporary risk for schistosomiasis.
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  • 29
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    Der Hautarzt 51 (2000), S. 95-100 
    ISSN: 1432-1173
    Keywords: Schlüsselwörter Dubowitz-Syndrom ; Atopisches Ekzem ; Monozygote Zwillinge ; Kinder ; Keywords Dubowitz syndrome ; Atopic eczema ; Monozygotic twins ; Children
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract Autosomal recessive inheritance, intrauterine growth retardation, short stature, microcephaly, distinct facial dysmorphism, psychomotoric retardation, and often uncharacterized eczematous skin lesions distinguish the rare Dubowitz syndrome. Here a pair of monozygotic twins with Dubowitz syndrome and clear-cut atopic eczema is presented.
    Notes: Zusammenfassung Autosomal rezessiver Erbgang, intrauterine Wachstumsretardierung, Kleinwüchsigkeit, Mikrozephalie, charakteristische Gesichtsdysmorphie, psychomotorischer Entwicklungsrückstand sowie häufig nicht näher charakterisierte ekzematöse Hautveränderungen kennzeichnen das seltene Dubowitz-Syndrom. Wir berichten über monozygote Zwillinge mit Dubowitz-Syndrom und eindeutigem atopischen Ekzem.
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  • 30
    ISSN: 1432-1173
    Keywords: Schlüsselwörter Atopisches Ekzem ; Kinder ; Elternschulung ; Video ; Mütter ; Key words Atopic eczema ; Parental education ; Video ; Children ; Mothers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract Background and Objective. Psychological problems in children and parents related to children's atopic eczema (AE) may impede the success of treatment. We studied the question, if behavior-based parental education in groups (DPE) or standardized video-education (VPE) could enhance dermatological treatment effects and reduce skin-damaging behaviors in children and stress in their mothers. Patients/Methods. 47 mothers attending the university outpatient-clinic for dermatology and their AE-children (mean age 4 years) participated in the study. 18 mothers underwent the DPE (10 sessions), 15 mothers worked with VPE at home. Dermatological standard treatment (CG; N=14) served as control for a 16-weeks-evaluation-period. Results. AE-symptoms improved overall, but the effectiveness of the treatments differed significantly, improval with parent education and was best with VPE. Psychological problems of mothers were equally reduced with DPE and VPE. Conclusions. It is suggested that VPE is a cost effective and less time consuming method for supporting dermatological therapy of AE in children.
    Notes: Zusammenfassung Hintergrund und Fragestellung. Das atopische Ekzem (AE) im Kindesalter kann psychologische Probleme bei Kind und Eltern zur Folge haben, die den Behandlungserfolg erschweren. Die Effektivität direkter verhaltensorientierter Elterngruppenschulungen (DES) bzw. standardisierter Videoschulungen (VES) gegenüber der dermatologischen Standardbehandlung (KG) zur Besserung des AE, des Kratzverhaltens der Kinder und krankheitsbedingter Belastungen der Mütter wurde überprüft. Patienten/Methodik. An der Studie nahmen 47 Mütter und deren AE-Kinder (Durchschnittsalter 4 Jahre) aus der Neurodermitisambulanz der Universitätshautklinik teil, 18 Mütter besuchten die DES (10 Gruppensitzungen), 15 Mütter arbeiteten mit der VES zu Hause. Die Behandlung der KG (n=14) erfolgte im vergleichbaren 4-Monats-Zeitraum. Ergebnisse. Das AE war über alle Behandlungsbedingungen gebessert, ihre Effekstärken unterschieden sich jedoch signifikant: Elternschulungen waren effektiver als Standardbehandlung, den stärksten Effekt hatte die VES. Belastungen der Mütter reduzierten sich nach beiden Schulungsformen. Schlussfolgerungen. Die Ergebnisse verweisen auf eine Zeit und Kosten sparende Möglichkeit, Videoschulungen für die Unterstützung der Therapie des AE im Kindesalter zu nutzen.
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  • 31
    ISSN: 1432-1173
    Keywords: Schlüsselwörter Dermatologie ; Primary Health Care ; Langzeitergebnisse ; Kinder ; Kenia ; Keywords Dermatology ; Primary health care ; Long-term effects ; Children ; Kenya
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract Background and Objective. In spite of the importance of skin diseases in Africa south of the Sahara, dermatology is insufficiently represented within the established primary health care systems. Aim of this study was to find out whether an integrated dermatology project could reduce the prevalence of dermatoses. Patients/Methods. Since 1994 trained community health workers have carried out regular weekly visits to schools and nurseries in 10 communities in rural western Kenya. Epidemiological studies were done in 13 schools in 4 communities involving 5780 and 4961 pupils one year before (1993) and 5 years (1999) following the introduction of the dermatology project. Results. Within this period the prevalence of bacterial skin infections fell from 12.7% to 11.3% (n.s.). Mycoses rose from 10.1% to 13.9% (p〈0.05), while arthropod infections (mainly scabies) remained unchanged with a prevalence of 8.3% in 1993 and 8.0% in 1999 (n.s.). Dermatitis also showed no changes (1.7% in both years). Conclusions. The prevalence of infective dermatoses depends not only on medical treatment but also far more on socio-economic factors.
    Notes: Zusammenfassung Hintergrund und Fragestellung. Trotz der großen Bedeutung der Dermatosen in Schwarzafrika ist die Dermatologie in den dort etablierten Basisgesundheitsdiensten völlig unzureichend repräsentiert. Untersucht werden sollten die Langzeitauswirkungen eines in das Primary Health Care-System integrierten Dermatologieprojekts in Bezug auf die Prävalenz von Hauterkrankungen. Patienten/Methodik. Seit 1994 besuchen ausgebildete Community Health Workers einmal wöchentlich Schulen und Vorschulkindergärten in 10 Gemeinden im ländlichen Westkenia. In 13 Schulen von 4 Gemeinden wurden 1 Jahr vor (1993) und 5 Jahre nach (1999) Projektinitiierung Reihenuntersuchungen an 5780 bzw. 4961 Kindern durchgeführt. Ergebnisse. Innerhalb dieses Zeitraums sank die Prävalenz bakteriell bedingter Dermatosen von 12,7% auf 11,3% (n.s.). Bei den Mykosen fand sich ein Anstieg von 10,1 auf 13,9% (p〈0,05). Arthropodenbedingte Infektionen (vorwiegend Skabies) blieben mit 8,3% 1993 und 8,0% 1999 (n.s.) im Wesentlichen gleich. Ekzeme wiesen zu beiden Zeitpunkten eine Prävalenz von 1,7% auf. Schlussfolgerungen. Die Prävalenz infektiöser Dermatosen hängt nur zu einem geringen Teil von der medizinischen Versorgung, sondern überwiegend von sozioökonomischen Faktoren ab.
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  • 32
    ISSN: 1129-2377
    Keywords: Key words Coeliac disease ; Headache ; Children ; HLA antigens
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The linkage between HLA antigens and disease susceptibility has been investigated in several diseases. Two different mechanisms are known to act in the relation between the HLA system and headache: linkage and association of alleles. Among neurological disorders associated with coeliac disease (CD) we focused on headache in 1997. From a group of 70 coeliac children, we studied 10 children with headache (3 boys and 7 girls). For each subject we evaluated clinical history and HLA antigens. The incidence of headache was not different with respect to the prevalence of headache in the general population. The HLA setting is not different between the 2 groups examined. However, we highlight 2 cases for the particular HLA setting.
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  • 33
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    Accreditation and quality assurance 5 (2000), S. 409-413 
    ISSN: 1432-0517
    Keywords: Key words Metrology ; Comparisons ; Chemistry ; Standards
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract  After stressing the importance in the modern world of accurate and reproducible measurements, the actions taken by the Bureau International des Poids et Mesures to set up, together with the regional metrology organizations, a series of key comparisons are described. They are the technical foundation of a mutual recognition of national measurement standards arrangement prepared in conjunction with the National Metrology Institutes (NMIs). This arrangement also includes the recognition of calibration and measurement certificates issued by these institutes. Then, the consequences of this arrangement for trade are described. The case of chemical analysis is illustrated by the application of the Kyoto protocol on the reduction of greenhouse gases. But the global workload to be taken up by the International Committee of Weights and Measures, its Consultative Committee for Amount of Substance and the NMIs is huge.
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  • 34
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    The journal of headache and pain 1 (2000), S. 169-172 
    ISSN: 1129-2377
    Keywords: Key words Migraine ; Sleep ; Sleep apnea ; Children
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In our previous study we found a high prevalence of disordered sleep breathing in migraine children vs. controls. Since no quantitative studies about sleep respiratory disorders have been carried out in migraine children, we performed a polysomnographic (PSG) study in 10 migraine patients (7 boys, 3 girls; mean age 8.11 years, range, 5.8–14.5) attending the Headache Center of our department, to evaluate the presence of sleep apnea. Mothers completed a headache diary and a sleep diary for at least 1 month and filled out a sleep questionnaire. PSG data showed a normal sleep architecture in 3 cases, an insomnia pattern in 2, a reduction of slow wave sleep in 3 and a reduction of REM sleep in 2. Respiratory analysis revealed that 2 of 10 patients had obstructive sleep apnea. These 2 patients presented habitual snoring and associated sleep disturbances such as restless sleep and hypnic jerks. Sleep apnea may be a subtle and often undiagnosed symptom in several migraine patients. The report of habitual snoring associated with other sleep disturbances such as restless sleep and other parasomnias may be a sign of sleep apnea in migraine children.
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  • 35
    ISSN: 1468-2869
    Keywords: Asthma ; Children ; Chronic illnesses ; Diabetes ; Self-help ; Training
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Abstract A randomized field trial of a child-centered model of training for self-management of chronic illnesses was conducted of 355 Spanish-speaking school-aged children, between 6 and 15 years old, with moderate to severe asthma and epilepsy, in Buenos Aires, Argentina. The model, based on play techniques, consists of five weekly meetings of 8–10 families, with children's and parents' groups held simultaneously, coordinated by specially trained teachers and outside the hospital environment. Children are trained to assume a leading role in the management of their health; parents learn to be facilitators; and physicians provide guidance, acting as counselors. Group activities include games, drawings, stories, videos, and role-playing. Children and parents were interviewed at home before the program and 6 and 12 months after the program, and medical and school records were monitored for emergency and routine visits, hospitalizations, and school absenteeism. In asthma and epilepsy, children in the experiment showed significant improvements in knowledge, beliefs, attitudes, and behaviors compared to controls (probability of experimental gain over controls=.69 for epilepsy and .56 for asthma, with σ2= .007 and .016, respectively). Parent participants in the experiment had improved knowledge of asthma (39% before vs. 58% after) and epilepsy (22% before vs. 56% after), with a probability of gain=.62 (σ2=.0026) with respect to the control group. Similar positive outcomes were found in fears of child death (experimental 39% before vs. 4% after for asthma, 69% before vs. 30% after for epilepsy), as well as in disruption of family life and patient-physician relationship, while controls showed no change. Regarding clinical variables, for both asthma and epilepsy, children in the experimental group had significantly fewer crises than the controls after the groups (P=.036 andP=.026). Visits to physicians showed a significant decrease for those with asthma (P=.048), and emergency visits decreased for those with epilepsy (P=.046). An 18-item Children Health Locus of Control Scale (CHLCS) showed a significant increase in internality in experimental group children with asthma and epilepsy (P〈.01), while controls did not change or performed worse 12 months after the program. School absenteeism was reduced significantly for those with asthma and epilepsy (for the group with asthma, fall/winterP=.006, and springP=.029; for the group with epilepsy,P=.011). Conclusion The program was successful in improving the health, activity, and quality of life of children with asthma and epilepsy. The data suggested that an autonomous (Piagetian) model of training is a key to this success, reinforcing children's autonomous decision making.
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  • 36
    ISSN: 1436-3771
    Keywords: Key words Age ; Children ; Dental fluorosis ; Severity ; Tooth eruption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  The purpose of this study was to investigate the influence of age on the severity of dental fluorosis in children exposed to drinking water with either low or high fluoride concentrations. The children selected for this study were aged 10–14 years, with 28 permanent teeth and at least 1 tooth pair with fluorosis. The children were permanent residents of districts in western Uganda with either 0.5 mg (n=33) or 2.5 mg fluoride/l in drinking water (n=186). All vestibular tooth surfaces were examined for fluorosis using the modified Thylstrup and Fejerskov (TF) index. In the high fluoride community, the proportion of teeth per child with TF scores ≥4, and ≥5 was significantly higher among children aged 13–14 years compared to those aged 10–12 years. Children’s chronological age correlated positively and significantly with the median TF scores for all teeth, including early erupting (first molars and incisors) and late erupting teeth (canines, premolars and second molars). In linear regression analyses, the median TF score for all teeth, as well as for early erupting and late erupting teeth, increased significantly with age. On the other hand, in the low fluoride community there was no significant association between age and the severity of fluorosis. This study showed a significant increase in the severity of fluorosis with increasing age in a high fluoride community, whereas no change in severity with age was observed in a low fluoride community.
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  • 37
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    Trauma und Berufskrankheit 2 (2000), S. S138 
    ISSN: 1436-6274
    Keywords: Schlüsselwörter ; Vorderes Kreuzband ; Kind ; Wachstumsfuge ; Fehlwachstum ; Key words ; Anterior cruciate ligament ; Children ; Growth plate ; Growth disturbance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract Lesions of the anterior and posterior cruciate ligaments are relatively rare in childhood and adolescence; in this age group they need even more consistent and aggressive treatment than in adults as far as conservation of the menisci and definitive stabilization are concerned. Virtually no cases in which serious growth disturbance has arisen following transepiphyseal drilling are known from the literature. Thus, cruciate ligament suturing should also not be done in children, because the long-term efficacy has not been confirmed. The operative procedure is presented in detail and is related to bone age. Early transepiphyseal drilling is permissible.
    Notes: Zusammenfassung Ligamentäre Kreuzbandverletzung beim Kind und im Adoleszentenalter sind relativ selten, sie bedürfen im Vergleich zum Erwachsenen ¶einer noch konsequenteren und aggressiven Behandlung bezüglich Meniskuserhalt und definitiver Stabilisierung. In der Literatur sind praktisch keine Fälle bekannt, bei denen es tatsächlich zu einem gravierenden Fehlwachstum nach transepiphysärer Bohrung gekommen ist. Insofern sollte auch die Kreuzbandnaht beim Kind wegen der nicht bewiesenen Langzeiteffizienz unterlassen werden. Das Vorgehen im Einzelnen in Bezug zum Skelettalter wird dargestellt. Frühzeitige transepiphysäre Bohrungen sind erlaubt.
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  • 38
    ISSN: 1432-2277
    Keywords: Key words Liver transplantation ; Children ; Risk factors for survival ; Primary non-function ; Hepatic artery thrombosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Several recipient, donor and operation factors as well as postoperative complications related to patient survival after liver transplantation (LT) in children were studied by univariate and multivariate analyses . In a 13-year period, 103 patients under 15 years of age underwent 120 LT; the mean age was 63 months and 36 % were under 2 years of age. Indications for LT were cholestatic disease in 68 (56 %), metabolic diseases in 18 (14 %), fulminant hepatic failure in 8 (7.5 %), cirrhosis in 7 (5.8 %), and retransplants in 17 (14 %). Whole liver was transplanted in 79 % of cases and partial liver in 21 %. Actuarial survival at 1, 5, and 10 years was 70 %, 61 %, and 57 %, respectively. United Network of Organ Sharing (UNOS) I recipients (RR = 2.7), primary non-function (PNF) (RR = 13.9), and hepatic artery thombosis (HAT) (RR = 3.8) were independent factors for lower patient survival in multivariate analysis. Thus, in our experience, postoperative mortality as a consequence of the patient's condition before transplantation, or complications such as PNF or HAT, are the major causes of decreased survival in pediatric LT.
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  • 39
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    Intensive care medicine 26 (2000), S. 942-949 
    ISSN: 1432-1238
    Keywords: Key words Ventilator-associated pneumonia ; Cardiac surgery ; Children ; Pediatric intensive care ; Complications ; Extubation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Objective: This study was undertaken to determine the delay of extubation attributable to ventilator-associated pneumonia (VAP) in comparison to other complications and complexity of surgery after repair of congenital heart lesions in neonates and children.¶Methods: Cohort study in a pediatric intensive care unit of a tertiary referral center. All patients who had cardiac operations during a 22-month period and who survived surgery were eligible (n = 272, median age 1.3 years). Primary outcome was time to successful extubation. Primary variable of interest was VAP. Surgical procedures were classified according to complexity. Cox proportional hazards models were calculated to adjust for confounding. Potential confounders comprised other known risk factors for delayed extubation.¶Results: Median time to extubation was 3 days. VAP occurred in 26 patients (9.6 %). The rate of VAP was not associated with complexity of surgery (P = 0.22), or cardiopulmonary bypass (P = 0.23). The adjusted analysis revealed as further factors associated with delayed extubation: other respiratory complications (n = 28, chylothorax, airway stenosis, diaphragm paresis), prolonged inotropic support (n = 48, 17.6 %), and the need for secondary surgery (n = 51, 18.8 %; e. g., re-operation, secondary closure of thorax). Older age promoted early extubation. The median delay of extubation attributable to VAP was 3.7 days (hazards ratio HR = 0.29, 95 % CI 0.18–0.49), exceeding the effect size of secondary surgery (HR = 0.48) and other respiratory complications (HR = 0.50).¶Conclusion: VAP accounts for a major delay of extubation in pediatric cardiac surgery.
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  • 40
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    Trauma und Berufskrankheit 2 (2000), S. S136 
    ISSN: 1436-6274
    Keywords: Schlüsselwörter ; Vordere Kreuzbandverletzung ; Kinder ; Rekonstruktion ; Indikation ; Key words ; ACL lesion ; Children ; Reconstruction ; Indications
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract For ACL lesions in children near to the end of the growth phase the treatment can be treated identical to that in adults. For younger children (8–12 years) the treatment must be conservative, combined with controls at short intervals. Behaviour during sport should be modified. If instability is experienced in activities of daily life or during sport a reconstruction of the ACL should be done using a central tibial transepiphyseal hamstring reconstruction with a femoral over-the-top position to avoid possible growth disturbances.
    Notes: Zusammenfassung Kreuzbandverletzungen bei Kindern, die nahe ihres Wachstumsabschlusses sind (14. bis 17. Lebensjahr) können wie Kreuzbandverletzungen von Erwachsenen behandelt werden. Kreuzbandverletzungen bei Kindern, die 13 Jahre und jünger sind, sollten zunächst abwartend behandelt werden (Kniebandage, Koordinationstraining, Belastungsreduzierung). Stellt sich im täglichen Leben oder bei sportlicher Belastung eine Instabilität im Sinne eines Giving way heraus, so sollte das Kreuzband rekonstruiert werden. Dabei ist es nach allen vorliegenden Daten unbedenklich, die Tibia zentral mit einem 8-mm-Bohrloch zu durchbohren und ein ligamentäres Transplantat durchzuziehen. Femoral ist es aus Sicherheitsgründen eher sinnvoll, statt einer transossären Bohrung die Over-the-top-Position zu wählen. Auch andere, rein epiphysäre Verankerungsmethoden (Semitendinosusplastik mit transossärer Drahtfixation) sind möglich.
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  • 41
    ISSN: 1439-0973
    Keywords: Key Words Ritonavir ; Nelfinavir ; Children ; Antiretroviral agents ; HIV-1
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Background: Knowledge concerning the long-term antiretriviral and immunological efficacy of protease inhibitors in children is limited. Patients and Methods: An open-label, prospective, multicenter clinical trial was conducted over a period of 72 weeks in Switzerland. 60 HIV-1 infected children (aged 0.3–16.9 years) naive to protease inhibitors were enrolled. Ritonavir or nelfinavir and at least one new nucleoside reverse transcriptase inhibitor were introduced into the durrent treatment regimen. HIV-1 RNA levels and CD4 cell counts were monitored after introducing the protease inhibitor, and the tolerability and safety of the drugs were assessed. Results: Dictated by chronological availability, 37 children received ritonavir and 23 nelfinavir. At baseline, children given ritonavir had higher mean plasma HIV-1 RNA levels (5.03 vs 4.63 log10 copies/ml; p = 0.001) and lower mean CD4 cell counts (277 vs 555 cells/μl; p = 0.009) than children given nelfinavir. Antiretroviral treatment (ART) naive children showed higher mean plasma HIV-1 RNA levels than non-naive (5.18 vs 4.64 log10 copies/ml; p = 0.02). The decline in plasma HIV-1 RNA levels 72 weeks after treatment with ritonavir and nelfinavir was −2.17 and −1.30 log10 copies/ml, respectively (p = 0.006) and in ART-naive vs non-naive patietns −2.70 vs − 1.39 log10 copies/ml (p ≤ 0.01). 69% of ART-naive patients and 32% of non-naive patients achieved sustained plasma HIV-1 RNA levels 〈 400 copies/ml. Increases in CD4 cells were higher in ART naive compared to non-naive patients (p 〈 0.04). Conclusion: The antiretroviral and immunologic benefits of protease inhibitors are more profound in ART-naive than in non-naive children.
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  • 42
    ISSN: 1439-0973
    Keywords: Key words Tick-borne encephalitis ; Children ; Adults
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The aim of this prospective study was to compare epidemiological data and clinical features in children and adults with tick-borne encephalitis (TBE). Patients with aseptic meningitis diagnosed at the University Medical Centre, Department of Infectious Diseases, Ljubljana, Slovenia, from June to August 1997, in whom the diagnosis of TBE was ascertained by the presence of serum IgM antibodies against TBE virus, who were serologically negative for Borrelia burgdorferi sensu lato and had a negative PCR CSF result on enteroviral infection, were included in the study. Out of 213 patients with aseptic meningitis, 80 (37–56%) fulfilled inclusion criteria. There were 20 children and 60 adults. In both groups males predominated. Virtually all patients had headache and fever, and more than 50% suffered from vomiting. The majority of patients in both groups recalled a tick bite, had a biphasic course of the illness, and was found to have obviously expressed meningeal signs. In both groups the median CSF leukocyte count was somewhat lower than 100 × 106/l with a predominance of lymphocytes. Children were more often given antibiotics during the initial phase of TBE than adults (p = 0.0095). Several other statistically significant distinctions (p 〈 0.05) were found including the frequency of fatigue, malaise, vertigo, photophobia, myalgias, arthralgias, as well as elevated CSF albumin and protein concentration, elevated albumin quotient and IgG quotients; all these findings were more often present in adults. In addition a longer duration of fever, more frequent need for anti-edematous treatment and longer hospitalization were found in adults. Direct comparison of clinical and epidemiological characteristics of TBE in children and adults revealed differences in several clinical and laboratory features and corroborates the previous conclusion that TBE in childhood is a milder illness than TBE in adults.
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  • 43
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    Journal of urban health 77 (2000), S. 723-734 
    ISSN: 1468-2869
    Keywords: Child welfare ; Children ; Disclosure ; HIV ; Mothers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The purpose of this investigation was to ascertain the reasons given by mothers diagnosed with AIDS (acquired immunodeficiency syndrome) for disclosing or not disclosing their HIV (human immunodeficiency virus) status to their children, a dilemma faced by most HIV-infected parents and those who counsel them. We interviewed 29 mothers residing in one of two New York City facilities that provide housing and medical treatment for adults with AIDS. The majority of these mothers do not live with their children, but all had recent face-to-face contact with them. The two reasons most frequently considered important for disclosing to children were that disclosure was the “right thing to do” and the need to make arrangements for children's future in case of maternal death or incapacity. The reason most frequently considered important for not disclosing was maternal concern about discussing death and dying with children. These findings have significant implications for counseling of HIV-positive parents.
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  • 44
    ISSN: 1439-0973
    Keywords: Key words Pertussis ; Bordetella pertussis ; Hospitalization ; Complications ; Vaccine ; Children
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We prospectively followed 725 children under 2 years of age with laboratory-diagnosed Bordetella pertussis infection to investigate the hospitalization rate and complications. Diagnosis was made by culture and polymerase chain reaction (PCR) from nasopharyngeal swabs in 11,016 children who presented with ≥ 7 days of cough at 63 pediatric practices in Germany. Of these children, 33 (4.5%) were hospitalized at a mean age of 4.8 months (range, 17 days to 19.5 months). Complications occurred in 16 (48%) of the 33 patients. Pneumonia developed in two (6%) children and a convulsion was observed in one (3%). Intensive care monitoring was required for 23 (70%) children. Further complications were bradycardia (21%), apnea (12%), conjunctivitis (12%), loss of weight (12%), otitis media (6%), atelectasis (3%) and dehydration (3%). Children aged 6–24 months who had not received any dose of pertussis vaccine had a ten-fold increased risk of hospitalization compared to those who had been partially or fully immunized (p 〈 0.05). Pertussis immunization should be given at an early point in time and completely in order to prevent severe courses of pertussis and hospitalization in young children.
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  • 45
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    Infection 28 (2000), S. 282-286 
    ISSN: 1439-0973
    Keywords: Key Words Chronic ; Osteomyelitis ; Therapy ; Children ; Ewing's sarcoma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Background: Presently, most children with chronic osteomyelitis undergo surgery with the inherent risk of damage to their growth plate. We demonstrate a treatment regimen based on imaging procedures focussing on antibiotics in order to reduce the rate of surgical interventions. Patients and Methods: We retrospectively evaluated all 11 patients with clinically suspected chronic osteomyelitis who were treated at our institution from 1989 to 1995. Patients underwent open biopsy and surgical treatment only if imaging procedures showed signs indistinguishable from malignancy, or if they were highly suggestive for the presence of pus, joint infection or osteonecrosis. The patients were followed up for a minimum of 3 years. Results: All five patients treated solely with antibiotics recovered completely. Three patients were subjected to open biopsy and surgical treatment since they showed radiological signs indistinguishable from malignancy, and two patients due to pus or osteonecrosis. In follow-up, there was one relapse of chronic osteomyelitis 11 months after the first treatment course with surgery and antibiotics. One patient suffering from Ewing's sarcoma as detected by open biopsy was excluded. Conclusion: Our diagnostic procedure was useful to reduce the rate of surgery. Surgical treatment of chronic osteomyelitis is not always neccessary especially in cases of missing necrosis, joint infection and abscess as demonstrated by the complete recovery of our patients treated solely with antibiotics.
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  • 46
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    Earth, moon and planets 88 (2000), S. 35-58 
    ISSN: 1573-0794
    Keywords: Chemistry ; interplanetary dust particles (IDPs) ; Leonids ; meteor trails ; meteoroids ; meteors ; structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The cometary Leonid meteoroids represent a size range in between largest carbon-richIDPs and the smallest CI meteorites. Their dustball structure and chemistry offer anopportunity to constrain hierarchical dust accretion inferred from petrologic studies ofaggregate and cluster IDPs. The Leonid shower meteoroids of known ``comet ejection''ages provide an opportunity to study space weathering of cometary dust over periodsof up to several hundred years. The meteors and aggregate and cluster IDPs displaycontinuous thermal modification of organics and volatile element (Na, K-bearing phases), that occur as discrete minerals and amorphous solids each different response during kinetically controlled ablation. Leonid meteoroids are not excessively Na-rich. The occurrences of Leonid meteors can now be accurate predicted and combined withknowledge better models for the settling rates, collections of surviving dust becomea comet nucleus-sampling mission.
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  • 47
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    Reading and writing 12 (2000), S. 191-218 
    ISSN: 1573-0905
    Keywords: Morphological awareness ; Sensitivity to word relations ; Reading ; Children
    Source: Springer Online Journal Archives 1860-2000
    Topics: Education
    Notes: Abstract The morpho-phonological nature of English orthography is examined in this study of the relation between morphological sensitivity and decoding ability in the latter elementary grades. Children in grades three to six were required to distinguish derivationally-related word pairs (e.g., nature-natural) from foil pairs that are related in spelling but not in morphology (e.g., ear-earth). The materials included both transparently-related (i.e., the second word incorporated the pronunciation of the first, as in person-personal) and complexly-related word pairs (i.e., the second word involved some change in pronunciation, as in atom-atomic). Across two experiments, these items were presented in either oral or written form along with various tests of reading ability, intelligence and phonological awareness. The results indicate that children's recognition of derivational relationships improved with grade-level. As anticipated, there was also a significant association between sensitivity to derivational relatedness and decoding ability which remains significant even when the word pairs were orally presented and even when phonological awareness in taken into account. Both phonological awareness and sensitivity to morphological structure emerge as important factors in decoding skill in the later elementary grades.
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  • 48
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    Archives of orthopaedic and trauma surgery 120 (2000), S. 336-337 
    ISSN: 1434-3916
    Keywords: Key words Pulled elbow ; Children ; Trauma ; Immobilization ; Nursemaid’s elbow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract To evaluate the effectiveness in decreasing recurrence of cast application after manual reduction of pulled elbow. Sixty-four children with pulled elbow were randomized into two treatment groups: Group A underwent manipulative reduction followed by splinting the elbow in a flexed and supinated position for 2 days; group B underwent manipulative reduction only. Both groups were examined 2, 5, and 10 days later. None of the 33 patients in group A had a pulled elbow at follow-up. Four (13%) of 31 patients in group B had a pulled elbow 2–5 days later. Immobilizing the elbow for 2 days after manipulative reduction improves the success of treatment of a pulled elbow.
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  • 49
    ISSN: 1433-0350
    Keywords: Keywords Syringomyelia ; Chiari I malformation ; Foramen magnum decompression ; Children ; Scoliosis ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  The authors studied the role of the sole posterior fossa bony decompression in the management of symptomatic children affected by Chiari type I anomalies. The series in the pediatric literature on this subject were reviewed and compared with that presented in this article. From May 1994 to December 1998, 53 patients (3 months to 26 years) were observed. They were divided into: asymptomatic patients (27), who received no surgical treatment and were only subject to clinical observation; symptomatic patients (brain stem compression 16, syringomyelia 10, including 7 with holocord). All the symptomatic patients were treated with the same surgical approach: bony decompression of posterior fossa with removal of the posterior arch of C-1 and the outer layer of the dura without dural opening. In all 16 (100%) of the 16 patients with brain stem compression the symptoms resolved or improved; in patients with syringomyelia the symptoms were resolved or improved in 94.4% of cases. Two children required further surgery after 13 and 24 months, respectively.This series seems to demonstrate that even a simple extradural surgical approach, with a lower rate of postoperative complications and short stay in hospital, is sufficient to arrest the disease and to improve the symptomatology in a high percentage of cases (97.2%), which is comparable to that achieved with other, more aggressive, procedures.
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  • 50
    ISSN: 1433-0350
    Keywords: Key words Botulism ; Electrophysiology ; Blink reflex ; Children
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Electrophysiological studies of a child with presumed botulism showed that the amplitude of the serially and electrically elicited blink reflexes Rl, R2 and R2’ was reduced during recovery. These findings suggest a conduction block of the facial nerves. Other nerve conduction studies and an incremental response to repetitive stimulation demonstrated a block of the presynaptic neuromuscular transmission. Results of the biological tests were negative, but those of electrodiagnosis and clinical examination favored a diagnosis of botulism. A combination of electrically elicited blink reflexes and rapid repetitive stimulation of the peripheral nerves was found to be a sensitive method of assessing the integrity of neuromuscular junctions and the subclinical impairment of muscle nerves.
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  • 51
    ISSN: 1433-0350
    Keywords: Key words Hydrocephalus ; Endoscopic III ventriculostomy ; Outcome ; MRI ; Cine-MRI ; Children
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  In order to analyze the surgical outcome according to clinical characteristics and to evaluate the correlation between clinical improvement and neuroimaging changes, we retrospectively reviewed 32 children who had undergone endoscopic III ventriculostomy (ETV) from February 1994 to May 1998. There were 15 boys and 17 girls, with a mean age of 5.2 years (range: 1 month to 13 years). The etiology of the hydrocephalus was primary aqueductal stenosis in 18 patients, secondary aqueductal stenosis caused by tumors in 5, IV ventricle outlet obstruction in 5, and hydrocephalus associated with meningomyelocele in 4. The mean duration of follow-up was 19.4 months (range 1–50 months). Overall, surgical outcome was regarded as good in 21 of 29 patients. Surgical outcome was poor in patients younger than 1 year (P〈0.05). Neuroimaging 1 month after ETV showed a decrease in ventricular size in 11 of the 16 patients with good surgical outcomes. Five showed minimal changes only. In patients with good outcomes, ventricular size tended to decrease as time passed. Resolution of periventricular edema, flow void in the III ventricle on T2-weighted axial images, and cine-MR imaging were sensitive indicators of good outcome. We suggest that ETV be considered as a primary treatment option in patients older than 1 year of age with noncommunicating hydrocephalus. In addition, time factors should be taken into consideration when surgical outcome is judged. Changes in ventricular size could not predict surgical outcome completely in themselves. Therefore, a comprehensive postoperative assessment should be made with the help of T2-weighted MRI and cine-MRI.
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  • 52
    ISSN: 1573-2649
    Keywords: Children ; Population sample ; Quality of life
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract This study aimed to assess the quality of life of a population sample of schoolchildren. The Generic Children's Quality of Life Measure (GCQ) has been developed to allow comparison between chronically ill children and the general child population. The measure assesses how the child views his or her life and also how they would like it to be. Quality of life is measured as the discrepancy between the two viewpoints. This large community-based survey aimed to establish GCQ norm values for children aged 6–14 years. The children were from a sample of schools stratified by geographical location and social need: rural affluent, rural low affluence, urban affluent and urban low affluence. 720 completed questionnaires were analysed. The scores were normally distributed with a wide range. The GCQ showed an acceptable reliability with a Cronbach's α of 0.75. The quality of life score was not correlated with age (r = −0.02, p = 0.64) nor with the deprivation score of the area in which the children lived (r = −0.026, p = 0.49). There were no significant differences between the scores by gender (p = 0.22) nor by rural/urban location (p = 0.60). Normative values were established. The GCQ is suitable for using with children over a large age range (6–14 years) without the scores being confounded by the age, gender, affluence or geographical location.
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  • 53
    ISSN: 1573-2584
    Keywords: Bladder injury ; Bowel injury ; Children ; Pelvic trauma ; Renal injury ; Urogenital trauma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We analysed the inter-relationships of the cause and the type of trauma, the presence of pelvic fracture, the associated intraabdominal organ injuries,and the morbidity and mortality rates in 154 patients presenting and being treated for UGT between 1983 and 1997.The cause of injury was blunt in 77% of cases and penetrating in 13%. The most frequently injured organs were kidney followed by urethra and bladder. Bowels, liver and spleen were the most frequently associated injured organs. Moreover, bladder injuries were strongly associated with bowel injuries (p 〈 0.0001). Hemodynamically normal 49 children with minor or major kidney injuries were managed conservatively. Hemodynamically non-stable 11 patients were explored.The majority of urogenital injuries can be managed conservatively evenwhen associated with intraabdominal organ injuries. Solid genitourinary organ injuries may accompany more frequently to intraperitoneal solidorgan injury. Whereas, non-solid genitourinary organ injuries may more frequently associated with injuries of intraperitoneal hollow viscus.
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  • 54
    ISSN: 1573-2649
    Keywords: Asthma ; Children ; Health-related quality of life
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract This study compared the health-related quality of life (HRQL) of 236 children with mild or moderate/severe asthma with that of a large representative sample of children in the general community. The study also examined the relationship between the HRQL of children with asthma and their demographic characteristics, asthma severity and family functioning. Children with asthma had a significantly poorer HRQL than other children in the community. Amongst the children with asthma, parents reported that children living in single-parent families had poorer physical health, mental health and social functioning than children in two-parent families. There was a significant relationship between the mental health of children with asthma and family functioning but no significant relationship between their physical health and family functioning. These findings suggest that the domains comprising the HRQL of children with asthma are related to both disease and non-disease factors. A better understanding of these relationships will facilitate the development of new interventions to help children with asthma.
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  • 55
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    Child & adolescent social work journal 17 (2000), S. 327-340 
    ISSN: 1573-2797
    Keywords: Death ; Children ; Cope
    Source: Springer Online Journal Archives 1860-2000
    Topics: Sociology
    Notes: Abstract Child welfare workers are in a unique position to help children and youth in out-of-home care who have experienced the death of a significant person. This article discusses the response of children to death from a developmental perspective and offers suggestions on how child welfare workers can use an ecological perspective to help youngsters cope with their grief.
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  • 56
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    Child & adolescent social work journal 17 (2000), S. 341-360 
    ISSN: 1573-2797
    Keywords: Community Violence ; Children ; Parents ; PTSD ; Cognitive- Behavioral Treatment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Sociology
    Notes: Abstract Community violence is increasingly recognized as a risk factor for serious psychological problems with children particularly vulnerable to its effects. This article summarizes the existing knowledge on the effects of chronic exposure to community violence, highlights essential issues in assessing children for both exposure and resulting trauma from community violence, and provides treatment guidelines for those affected children.
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  • 57
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    Child & adolescent social work journal 17 (2000), S. 431-442 
    ISSN: 1573-2797
    Keywords: Groups ; Solution-Focused ; Mutual Aid ; Children ; Incarcerated
    Source: Springer Online Journal Archives 1860-2000
    Topics: Sociology
    Notes: Abstract Children of incarcerated parents are five to six times more likely to go to prison than their peers (Johnston, 1995). Yet, there is a lacuna in the literature that examines the effectiveness of interventions for children with an incarcerated family member. The purpose of the present study is to describe a solution-focused, mutual aid group intervention and to examine the effects of the group on the self-esteem of elementary-age Hispanic children of incarcerated parents when compared to a no-treatment comparison group. Implications for social work practice and research with this vulnerable population are addressed.
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  • 58
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    Reading and writing 13 (2000), S. 81-103 
    ISSN: 1573-0905
    Keywords: Children ; Reading comprehension ; Working memory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Education
    Notes: Abstract Working memory capacity is described as a pool of limited resources that carry out processing and storage functions. Its role has been emphasised in adults' reading comprehension. The present study had two aims: First, to study the relationship between working memory capacity and reading comprehension in fourth-grade children. Second, to study the nature of the working memory resources involved in reading comprehension, i.e., are they specific or general?To test the first point, the predictive power of working memory capacity was compared with two reading-related basic skills, vocabulary and decoding skills. To test the second point, different working memory tasks were devised using verbal, numerical and spatial materials. All the tasks were administered to 48 fourth-grade children. The results showed that working memory capacity was a direct predictor of reading comprehension when contrasted with vocabulary and decoding skills. Moreover, it seemed that working memory would be better described as a system specialised for the processing of symbolic information in that only the verbal and in a lesser extent the numerical working memory tasks were significant predictors of reading comprehension. The spatial task did not correlate with reading comprehension. The reasons accounting for the predictive power of working memory tasks were discussed.
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  • 59
    ISSN: 1590-3478
    Keywords: Key words Human immunodeficiency virus ; Central nervous system ; Children
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Although the neurologic complications of HIV-1 infection during the first two years of life have been defined, the neurologic features in older children are not so well described. The present report is focused on the age-dependent neurologic presentation of HIV-1 infection. Sixty-two vertically HIV-1 infected children underwent detailed serial evaluations: neurologic assessment, neuropsychological tests, neuroimaging studies, and cerebrospinal fluid analysis. Neurologic involvement was found in 30 patients (48.3%). This population was divided into two groups, exhibiting progressive (83.3%) or nonprogressive (16.6%) neurologic signs and symptoms. In the first group of patients, progressive encephalopathy was distinguished from spastic paraparesis, possibly due to spinal cord involvement. The second group, represented by long-term survivors, requires clinical monitoring due to the possible prognostic value of acquired but presently nonprogressive signs of brain involvement. In contrast with the stereotyped features of the early form of progressive encephalopathy, the late form showed a polymorphic picture, with age-dependent neurologic manifestations. Multifocal white matter alterations and cerebral calcifications (sometimes with delayed onset and progression) were the prominent imaging findings. A correlation between cerebrospinal fluid HIV RNA levels, suggestive of viral replication within the central nervous system, and progressive neurological disease were also found.
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  • 60
    ISSN: 1434-193X
    Keywords: Triplet recombination ; Electron transfer ; Radical ions ; Photochemistry ; Terpenes ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---The triphenypyrylium tetrafluoroborate (TPT)-sensitized reactions of several terpene donor molecules, including sabinene (1), α-phellandrene (4), α-terpinene (5) and γ-terpinene (6) give rise to significantly different products than reactions induced by other electron-transfer sensitizers, such as 1,4-dicyanobenzene (DCB). The divergent reactions require decidedly different key intermediates; the products obtained with TPT can be explained by dissociative recombination of the intermediate radical-radical cation pair in the triplet state, generating donor-derived biradicals.
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  • 61
    ISSN: 1434-193X
    Keywords: Azides ; Cleavage reactions ; Cycloadditions ; Nitrogen heterocycles ; Polycycles ; Ring expansion ; Synthetic methods ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---2-Alkyl-1-methylquinazolinium hexafluorophosphates 9 are deprotonated by sodium or potassium hydride to afford solutions of 2-alkylidenedihydroquinazolines 10, which were investigated by NMR spectroscopy. Trapping with methanesulfonyl azide (5a) of 10 in situ or subsequent treatment with trifluoromethanesulfonyl azide (5b) gives mixtures of colourless (15) and intensely yellow N-sulfonylimino-1,4-benzodiazepines 16 along with products due to cleavage of the exocyclic double bond of 10, viz. 11 and 13. The ethylidene compound 10b yields the bicyclic products 18 and 19, apparently by complex sequences of reactions that are triggered by removal of the acidic proton at C-2 of 16b and 16f. The structures of the products are based on spectroscopic evidence and X-ray diffraction analyses performed on 15b, 16d, 16e, and 19.
    Additional Material: 6 Ill.
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  • 62
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    Liebigs Annalen 2000 (2000), S. 1589-1593 
    ISSN: 1434-193X
    Keywords: Azaallenium ions ; Azaallylium ions ; Iminium ion ; Kinetics ; Linear Free Energy Relationships ; Ab initio calculations ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---The rate constants for the reactions of the 2-azaallenium ion 1b+, the 2-azaallylium ion 2a+ and the iminium ion 3+ with different nucleophiles were determined by 1H NMR spectroscopy. By correlation with the Linear Free Enthalpy Relationship (LFER) lg k20°C = s (E + N), developed by Mayr and Patz, the electrophilicity parameters E(1b+) = -3.7, E(2a+) ≍ -16 and E(3+) = -10.43 were obtained. They show that the relative reactivities of these ions are approximately 1012:1:106. Quantum chemical calculations (ab initio, DFT) of the methyl anion affinities for the ions 1b+,2a+ and3+ are in agreement with the experimental E values. The X-ray structure of 3+·CF3SO3- is reported for the first time; it shows no strong interaction between the cation and the anion.
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  • 63
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    Liebigs Annalen 2000 (2000), S. 1595-1601 
    ISSN: 1434-193X
    Keywords: Oxazoline N-oxide ; Cycloadditions ; Cycloadditions ; Lactams ; Thienamycin ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---[3+2] Cycloaddition between a camphor-derived oxazoline N-oxide 9 and the γ,δ-unsaturated enamino ester 11 afforded the single adduct 6. A stereoselective reduction of the enamino ester side chain allowed the control of the absolute configuration of the two additional asymmetric centres. Nitrogen protection and oxidative hydrolysis of the resulting product 13, followed by further functional group manipulations, led to the β-lactam derivative 1, a known precursor of the β-methylthienamycin derivative2a.
    Additional Material: 1 Ill.
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  • 64
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    Liebigs Annalen 2000 (2000), S. 1603-1607 
    ISSN: 1434-193X
    Keywords: Boron ; Cyclotrimerizations ; Nitrogen heterocycles ; Macrocycles ; Subphthalocyanines ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---The regioselective preparation of ortho-substituted subphthalocyanides was achieved employing 3-substituted phthalonitrile derivatives as starting materials. A mechanistic proposal has been outlined.Supporting information for this article is available on the WWW under //http://www.wiley-vch.de/contents/jc_2046/2000/99525_s.pdf or from the author.
    Additional Material: 2 Ill.
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  • 65
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    Liebigs Annalen 2000 (2000), S. 1609-1615 
    ISSN: 1434-193X
    Keywords: Terpenoids ; Natural products ; Total synthesis ; Cyclizations ; Rearrangements ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---A new route for the synthesis of 2,7- and 7-functionalized labdanes starts from (R)-carvone (1). 11-Nordrim-7-en-9-one (15) is an appropriate starting material for the total synthesis of hispanone (21), a biologically active furolabdane isolated from the Mediterranean medicinal plant Ballota saxatilis.
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  • 66
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    Liebigs Annalen 2000 (2000), S. 1623-1626 
    ISSN: 1434-193X
    Keywords: Iridoid glucoside ; (8S)-Kingiside ; (8S)-Loganin ; (8S)-7-Ketologanin ; Asymmetric synthesis ; Natural products ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---The tetraacetyl derivative 8 of the naturally occurring kingiside (8a) was prepared from aucubin (1). Intermediates in the synthesis were (8S)-tetraacetyl loganin (6) and (8S)-tetraacetyl-7-ketologanin (7), whose free (8R)-epimers occur in many different plants (Caprifoliaceae, Loganiaceae). The 13C NMR spectrum allows the structure to be unequivocally identified.
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  • 67
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    Liebigs Annalen 2000 (2000), S. 1677-1683 
    ISSN: 1434-193X
    Keywords: Radicals ; Cyclizations ; Pyridinethione ; Tetrahydrofurans ; Asymmetric synthesis ; Thiazolethione ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---The trisubstituted functionalized tetrahydrofurans 10, 11, 16, 18, and 19 were photochemically prepared from 2,3-syn- and 2,3-anti-configuredN-(3-benzoyloxy-5-hexen-2-oxy)thiazole-2(3H)-thione anti-6, pyridinethiones 7, anti-8, and BrCCl3. The formation of tetrahydrofurans was achieved by an efficient and highly regioselective alkoxyl radical cyclization (5-exo-trig). The 2,3-anti substituted intermediates 9 and 12 cyclize stereoselectively whereas a 2,3-syn-configured O-radical affords both possible diastereomeric addition products in equal amounts. The cyclized tetrahydrofuryl methyl radicals were trapped with the bromine atom donor BrCCl3 to afford the bromomethyl-substituted cyclic ethers 10, 11, 18, and 19 in excellent yields. The utility of this reaction was stressed by conversion of one of the newly prepared tetrahydrofurans in a two-step synthesis into (+)-allo-muscarine (+)-20.Supporting information for this article is available on the WWW under //http://www.wiley-vch.de/contents/jc_2046/2000/99590_s.pdf or from the author.
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  • 68
    ISSN: 1434-193X
    Keywords: Thioketones ; Thiocarbonyl ylides ; Cycloadditions ; Cycloreversions ; Sulfur heterocycles ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---Reactions of diaryl thioketones with diazomethane at room temperature afford 4,4,5,5-tetraaryl-1,3-dithiolanes; the scope of this surprising 2:1 interaction has been studied for decades (Schönberg Reaction). The clue to the mechanism was our observation that the stoichiometry is 1:1 at -78 °C, and 2,5-dihydro-2,2-diaryl-1,3,4-thiadiazoles are formed as primary [2+3] cycloadducts. They lose N2 at -45 °C in first-order reactions generating diaryl thioketone S-methylides which can be intercepted by thioketones (→1,3-dithiolanes), multiple CC bonds, or acids HX. In the absence of trapping reagents, the elusive intermediates either dimerize furnishing 2,2,3,3-tetraaryl-1,4-dithianes or give rise to 2,2-diarylthiiranes by electrocyclization. Beyond thiobenzophenone and diazomethane, our main model reaction, the studies involve fluorene-9-thione, 4,4-dimethoxy- and 4,4-dichlorothiobenzophenone. The ring of 2,5-dihydro-2,2-diphenyl-1,3,4-thiadiazole (8) is opened by LDA at -78 °C and derivatives of anion 12 are obtained. - In summa: The Schönberg reaction consists of two 1,3-dipolar cycloadditions, linked by a 1,3-dipolar cycloreversion.
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  • 69
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    Liebigs Annalen 2000 (2000), S. 1695-1702 
    ISSN: 1434-193X
    Keywords: Thiocarbonyl ylides ; Cycloadditions ; Dithiolanes ; Sulfur heterocycles ; Thioketones ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---2,5-Dihydro-2,2-diphenyl-1,3,4-thiadiazole (4) eliminates N2 at -45 °C and generates thiobenzophenone S-methylide (5), which is intercepted by dipolarophiles. The 1,3-cycloadditions of 5 with thiones (aromatic and aliphatic thioketones, dithioesters, trithiocarbonate) furnish 1,3-dithiolanes 7, in which the substituents, even voluminous ones, appear in the proximal 4- and 5-positions. The reaction of 5 with adamantanethione furnishes 7h and 4,4,5,5-tetraphenyl-1,3-dithiolane (7a) in a ratio of 4:1; a methylene transfer is involved, and the mechanistic pathways are discussed. The cycloadduct 7f originating from 5 and diphenyl trithiocarbonate undergoes an isomerization which consists of ionization and ring-opening leading to a ketene dithioacetal structure.
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  • 70
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    Liebigs Annalen 2000 (2000), S. 1759-1765 
    ISSN: 1434-193X
    Keywords: Cyclitols ; Aminocyclitols ; Glycosidase inhibitors ; α-Mannosidase inhibitors ; Deoxygenation ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---Three deoxy derivatives 2-4 of the α-mannosidase inhibitor mannostatin A (1) were synthesized, and their inhibition of Jack bean α-mannosidase was evaluated in order to elucidate the roles of each of the three hydroxyl groups of the inhibitor. The 1- and 2-deoxy derivatives 2 and 3 retained some inhibitory activity, although reduced by a factor of about 100 relative to the parent, whereas it was completely lost with the 3-deoxy derivative 4. Structure and activity relationships are discussed in the light of these findings.
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  • 71
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    Liebigs Annalen 2000 (2000), S. 1767-1772 
    ISSN: 1434-193X
    Keywords: Circular dichroism ; Conformation analysis ; s-Triazines ; Chiral auxiliaries ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---CD data of the optically pure 2-[(R)-1-(9-anthryl)ethylamino]-4-chloro-6-[(R)-1-(1-naphthyl)ethylamino]-1,3,5-triazine, 2[(R)-1-(9-anthryl)ethylamino]-4,6-bis[(R)-1-(1-naphthyl)ethylamino]-1,3,5-triazine, 2,4-bis[(R)-1-(9-anthryl)ethylamino]-6-chloro-1,3,5-triazine are presented. The analysis of the CD spectra by means of the nonempirical DeVoe approach has afforded the complete conformational characterisation of the three s-triazine derivatives, allowing us to establish how the conformation of these derivatives depends on the nature of the substituent 1-arylethylamino groups.
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  • 72
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    Liebigs Annalen 2000 (2000), S. 1905-1911 
    ISSN: 1434-193X
    Keywords: α,β-Epoxy ketones ; Rearrangements ; Zeolites ; Clays ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---Various cyclic α,β-epoxy ketones rearranged to α-formyl ketones and/or vic-diones in the presence of catalytic amounts of zeolites and montmorillonite K10. This provides an excellent alternative to conventional homogeneous systems with respect to yields and workup. Differences in product distribution and type of products in the rearrangement of pulegone oxide could be reasonably explained by invoking different pathways for homogeneous and heterogeneous catalysts.
    Additional Material: 4 Tab.
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  • 73
    ISSN: 1434-193X
    Keywords: Amidines ; Chiral bases ; Enantioselective catalysis ; Enantioselective synthesis ; N-acyliminium ions ; Oxazaborolidines ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---The synthesis and X-ray crystal structures of three enantiopure hydroxy-substituted amidines of the DBN-type are described. The key starting material, a 5-(phenylsulfonyl)pyrrolidin-2-one, was obtained by an oxazaborolidine-catalysed reductive desymmetrization of a meso-imide and was functionalized through N-acyliminium ion chemistry. The hydroxy groups were introduced by ozonolysis or reduction. Preliminary results on the use of the hydroxyamidines as chiral, bifunctional catalysts in selected Michael reactions are described.
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  • 74
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    Liebigs Annalen 2000 (2000), S. 199-204 
    ISSN: 1434-193X
    Keywords: Hexafluoroacetone ; N-Methylaspartic acid ; N-Methylglutamic acid ; N-Methyl-α-aminoadipic acid ; N-Methylthiazol-4-yl-α-amino acids ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: N-Methylaspartic acid derivatives and its homologues are obtained by a stereoconservative one-pot procedure from hexafluoroacetone-protected aspartic and glutamic acid, 2a and 2b, respectively. α-Aminoadipic acid (5c) and its derivative 6c are accessible from the corresponding glutamic acid derivative 9b by a Wolff rearrangement. A variety of homochiral N-methylamino acids, 5 and 12, and their derivatives, 6 and 8-11, become readily available by the new synthetic concept.
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  • 75
    ISSN: 1434-193X
    Keywords: Fullerenes ; Cycloadditions ; Donor-acceptor systems ; Cyclic voltammetry ; Photoinduced electron transfer ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---The new C60 and C70 adducts 1b, 1d-1k, 1m, 6d, 7d, and 8d have been synthesized by [2+3] cycloadditions of the appropriate nitrile oxides. Variations in the distance and geometry of the donor and acceptor substituents are seen to have an influence on the redox behavior of the fullerene adducts in cyclic voltammetry experiments. The isoxazolo-fullerenes 1c, 1d, and 1i show shifts of about 30 mV or 40 mV to more negative values compared with the reference compound 1a. On the other hand, strong acceptor properties are detected in the case of compound 1e, which shows a positive shift of 30 mV relative to 1a. Moreover, time-resolved fluorescence spectroscopy has shown that upon excitation of the fullerene moiety in the polar solvent benzonitrile, an electron is transferred from the donor substituent to the first excited singlet state of the fullerene, thereby reducing the excited-state lifetime. Our data demonstrate that the electron-transfer rate in donor-substituted fullerenes can be controlled by the electron-donating property of the substituent as well as the electronic structure and/or length of the spacer used. The C70 regioisomers 6d, 7d, and 8d exhibit differences in their spectroscopic characteristics.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 76
    ISSN: 1434-193X
    Keywords: Aminooxy group ; Phosphorylations ; Nucleotides ; Fluorescent labelling ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---Preparation of the uridine and adenosine triphosphates 1 and 2 bearing a linker with a terminal aminooxy group is described. Both 1 and 2 react readily with the aldehydic fluorescein derivative 15. They could each be incorporated into a 330-mer fragment with T7 RNA polymerase.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 77
    ISSN: 1434-193X
    Keywords: “Proton sponge” analogues ; Orientation dependence of hydrogen bonds ; Crystal structures ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---1,2,4,5-Tetrakis(dimethylamino)benzene (4) and 2,3,6,7-tetrakis(dimethylamino)naphthalene (5) were prepared and structurally determined. Electron-donor functions, protonation, and the geometry of intramolecular hydrogen bonds are discussed. By oxidation of 4 to its dication the benzenoid aromaticity is cancelled in favour of two independent cyanine-type units as determined by X-ray structure analysis.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 78
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 365-380 
    ISSN: 1434-193X
    Keywords: Fluorescent dyes ; Perylenes ; Heterocycles ; NIR dyes ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---Core-extended perylenetetracarboxylic bisimides were prepared by Diels-Alder reaction followed by reduction, or by nitration followed by cyclisation. Highly fluorescent dyes were obtained with absorption regions from the visible to the NIR. Applications for solar energy harvesting, and quantum counters were suggested.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 79
    ISSN: 1434-193X
    Keywords: Radicals ; Photochemistry ; Aliphatic ethers ; Hydrogen abstraction ; Urazolyl radical ; α-Alkoxy-alkyl radical ; Diones ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---The photoaddition of 4-methyl-1,2,4-triazoline-3,5-dione (4-MTAD) with a wide variety of acyclic, cyclic and crown aliphatic ethers has been investigated. Monochromatic (λ = 514.5 nm) or polychromatic (λ ≥ 310 nm) irradiations give identical mono-urazolyl ethers as reaction products. Unsymmetrical acyclic ethers afford a mixture of the two α and α′ mono-urazolyl ethers. In the case of 12-crown-4, mono and di-substituted products are obtained. ESR experiments and quantum calculations at the AM1 and 6-31G* levels were performed and a possible reaction mechanism is proposed in which the most probable photochemical process is the H-abstraction leading to a urazolyl radical.Supporting information for this article is available on the WWW under //http://www.wiley-vch.de/contents/jc_2046/2000/099269_s.pdf or from the author.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 80
    ISSN: 1434-193X
    Keywords: Photoinduced electron transfer ; Enantioselective syntheses ; Amino acids ; α-Hydroxy acids ; (S)-Prolinol ; Recyclable chiral auxiliary ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---PET activation of 1-(N-benzyl-N-methylglycyl)-(S)-prolinol (1) in dry acetonitrile, utilizing 1,4-dicyanonaphthalene (DCN) as a light-harvesting electron-acceptor and methyl viologen (MV++) as an electron-transfer mediator, leads to the formation of 3-[benzyl(methyl)amino]perhydropyrrolo[2,1-c][1,4]oxazin-4-one (3). When this photolysis is carried out in aqueous acetonitrile, exclusively 3-hydroxyperhydropyrrolo[2,1-c][1,4]oxazin-4-one (4) is produced. The formation of 3 can be rationalized in terms of intramolecular cyclization of the in situ generated iminium cation intermediate (2) by the OH moiety of (S)-prolinol, while 4 is generated by hydrolysis of 2 followed by acetalization. Nucleophilic alkylation of 3 and 4, using Grignard reagents and allyltrimethylsilane/TiCl4, provides 12a-d & 15 and 17a-c & 21, respectively, in a highly stereoselective manner. Hydrolysis of the resultant amides (12, 15, 17, and 21) provides α-amino acid derivatives (14) and α-hydroxy acids, respectively, in optically active form, along with the recovered (S)-prolinol chiral auxiliary in its recyclable form.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 81
    ISSN: 1434-193X
    Keywords: Tetrathiafulvalenes ; Charge transfer ; UV/Vis spectroscopy ; Cyclic voltammetry ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---4-[2-tetrathiafulvalenyl-ethenyl]pyridine (1) has been prepared from a Wittig reaction between formyltetrathiafulvalene and 4-picolyltriphenylphosphonium chloride hydrochloride. Conversion of the pyridine moiety of 1 by reaction with methyl iodide leads to 4-[2-tetrathiafulvalenyl-ethenyl]-1-methylpyridinium iodide (2a). Neutralization of 1 with a large excess of L-tartaric acid affords 4-[2-tetrathiafulvalenyl-ethenyl]-1-methylpyridinium hydrogen tartrate (3). These TTF-π-spacer-acceptor compounds have been characterized by elemental analysis, and IR and 1H NMR spectroscopy. The crystal structure of 2a has been determined by X-ray diffraction. The cation is essentially planar. Examination of the bond lengths in 2a, UV/Vis spectra and CV data, and calculations indicate that an intramolecular charge transfer occurs in the studied compounds, although it is rather limited, and larger in 2a and 3 than in 1.
    Additional Material: 3 Ill.
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  • 82
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 807-811 
    ISSN: 1434-193X
    Keywords: Proline analogues ; Asymmetric synthesis ; Schöllkopf's method ; Silicon ; Amino acids ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---The asymmetric synthesis of a new proline surrogate, incorporating the dimethylsilyl group at position 4 of proline using Schöllkopf's bis-lactim ether method, is described.
    Type of Medium: Electronic Resource
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  • 83
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 1345-1351 
    ISSN: 1434-193X
    Keywords: Kinetics ; Photochemistry ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The photochemical reaction of thionine (Th) with an organic reductant such as thioureas was studied in absolute methanol at constant temperature 25±0.1°C. Spectrophotometric methods were adopted for the determination of the values of absorbances in the presence of extremely dissociated, undissociated and partially dissociated acridine in absolute methanol. The acidity of the reaction solution H0 was controlled by using acetate buffer solutions. The effect of variables like concentration of thiourea, acidity and temperature on quantum yield (φ) was studied and the results were interpreted in terms of reaction mechanism. It was found that the quantum yield of the reactions of thionine with thiourea is controlled by two equilibria between (i) triplet state of thionine with proton and protonated triplet state of thionine, and (ii) protonated triplet state of thionine with reductant and associated complex (Th·H2T++·AH2).
    Additional Material: 5 Ill.
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  • 84
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 1353-1357 
    ISSN: 1434-193X
    Keywords: Heterocycles ; Rearrangements ; C-C coupling ; C-C coupling ; Cyclizations ; Isoquinolines ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: -5-Methylbenzo[b]thieno[2,3-c]isoquinolines and 5-methylbenzo[b]seleno[2,3-c]isoquinolines 11b,c have been prepared by Bischler-Napieralski cyclization of 2-acetamido-3-phenylbenzo[b]heteroarenes.
    Additional Material: 4 Tab.
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  • 85
    ISSN: 1434-193X
    Keywords: Endoperoxides ; Cycloheptatriene ; Dichloroketene ; Singlet oxygen ; Cobalt ; Porphyrins ; Furans ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: -CoII-tetraphenylporphyrin-catalyzed decomposition of bicyclic endoperoxides 4 and 5 with a strained double bond moiety has been studied. Compounds 4 and 5 have been synthesized by photooxygenation of 3 which itself was obtained by dichloroketene addition to cycloheptatriene, followed by removal of the chlorine atoms. An unusual decomposition mode of 4 promoted by CoII-TPP resulted in the formation of 8 and 9 which are important building blocks in furofuran systems.
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  • 86
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 1373-1373 
    ISSN: 1434-193X
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: -No Abstract.
    Type of Medium: Electronic Resource
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  • 87
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 1365-1372 
    ISSN: 1434-193X
    Keywords: Atropisomerism ; Transition states ; Enzyme inhibitors ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: -Transition state mimicry is one of the most powerful concepts in enzyme inhibitor design and has led to the development of catalytic antibodies. Transition state analogs are compounds with a fixed shape that resemble the geometry and charge distribution of the transition state of a given reaction. Stabilization of a transition state like conformation is most often achieved by incorporating a ring system into the analog. We show herein that atropisomerism can be used as a new principle for enforcing a transition state like conformation. Atropisomerism relates to the existence of stereoisomers of structurally constrained molecules due to a frozen rotation about a single bond, as for example in binaphthol. The 1-aminomethylnaphthalene derivative 1 exhibits atropisomerism due to a frozen rotation about the C(1)-C(methylene) single bond, which holds the dihedral angle θ[C(2)-C(1)-C(methylene)-N] close to 90°. Compound 1 mimics the transition state for hydride transfer between 1,4-dihydroquinolines 4 and acetone.
    Additional Material: 5 Ill.
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  • 88
    ISSN: 1434-193X
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: -No Abstract.
    Type of Medium: Electronic Resource
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  • 89
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 1377-1386 
    ISSN: 1434-193X
    Keywords: Diallenes ; Solid-state reactions ; Naphthocyclobutenes ; Benzodicyclobutadiene ; Through-bond interactions ; X-ray analysis ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---The title four-membered ring compounds, naphthocyclobutenes and benzodicyclobutadienes, were produced by thermal cyclization reaction of crystalline 1,2-diallenylbenzenes and 1,6-diethynyldiallenes, respectively. These solid-state reactions proceeded efficiently and stereoselectively. The naphthocyclobutenes were shown to have extremely long C(sp3)-C(sp3) bonds (1.720-1.733 Å). The benzodicyclobutadienes were also shown to have extremely long C(sp2)-C(sp2) bonds (1.540 Å).
    Additional Material: 4 Ill.
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  • 90
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 1387-1389 
    ISSN: 1434-193X
    Keywords: Natural products ; Epoxidations ; Asymmetric synthesis ; Fluorine ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---The synthesis of enantiomerically and diastereomerically pure (-)-(1R,2R,5R)- and (-)-(1R,2S,5R)-2-fluoro frontalin (7) starting from (+)-(1S)-menthyl-(R)-toluene-4-sulfinate, methylmagnesium bromide, methyl fluoroacetate, 4-pentenyl bromide and diazomethane is described. The absolute stereochemistry was unambiguously determined by X-ray analysis of (+)-(1S,2R,5S,RS)-5, an intermediate in the synthesis of the enantiomeric (+)-(1S,2R,5S)-2-fluoro frontalin (7).
    Additional Material: 2 Ill.
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  • 91
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 857-859 
    ISSN: 1434-193X
    Keywords: α,α-Dialkylated amino acids ; Isotopic labeling ; Strecker synthesis ; Solvent effects ; Stereoselective hydrolysis ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---[15N]-D-isovaline was prepared from DL-[α-15N]-α-aminoisovaleramide by enzymatic resolution with Mycobacterium neoaurum. The 15N-isotope was introduced during the Strecker synthesis of its precursor, e.g. aminoisovaleronitrile. Attempts to prepare the amino nitrile precursor of [15N]-α-aminoisobutyric acid (Aib) led to a poor yield and loss of the label. Significantly, improved results were obtained when a cosolvent is present during formation of aminoisobutyronitrile.
    Additional Material: 1 Ill.
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  • 92
    ISSN: 1434-193X
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---No Abstract.
    Type of Medium: Electronic Resource
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  • 93
    ISSN: 1434-193X
    Keywords: Spiro compounds ; Ring-closing metathesis ; Pauson-Khand reaction ; Carbohydrates ; Enynes ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---The synthesis of the ketoglycosidic enynes 5, 7 and 8 starting from 2,3,4,6-tetra-O-benzyl-D-glucopyranolactone (2) is described. These enynes are subjected to ruthenium-mediated ring-closing metathesis and Pauson-Khand cyclisation to afford the highly functionalised carbohydrate spiroacetals 9 and 11-14.
    Type of Medium: Electronic Resource
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  • 94
    ISSN: 1434-193X
    Keywords: Asymmetric synthesis ; Nucleophilic formylation ; Addition reactions ; Lactones ; Formyl anion equivalent ; Domino reactions ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---An efficient asymmetric synthesis of α-substituted β-formyl δ-lactones 5 (de ≥ 98%, ee = 80-95%) and 4-substituted furofuran lactones 6 (de ≥ 98%, ee = 80-〉98%) in acceptable overall yields is reported. Key steps of the new procedure are an asymmetric Michael addition of formaldehyde SAMP-hydrazone (1) to 5,6-dihydro-2H-pyran-2-one (2) under neutral conditions, followed by trans-selective α-alkylation and subsequent cleavage of the auxiliary by ozonolysis or a hydrolytic domino reaction protocol, respectively. The absolute configurations given for the title compounds are based on three X-ray structure analyses and NOE measurements.
    Additional Material: 3 Ill.
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  • 95
    ISSN: 1434-193X
    Keywords: Myxobacteria ; Antibiotics ; Cytotoxic ; Structure elucidation ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---A novel highly cytotoxic metabolite, apicularen A (1), was isolated in a screening of the myxobacterial genus Chondromyces. The structure of 1 is characterized by a salicylic acid residue as part of a 10-membered lactone, which bears an acylenamine side chain. Compound 1 is an inhibitor of the proliferation of human cancer cell lines and induces apoptosis. Apicularen A (1) is present in nearly every strain of C. apiculatus, C. pediculatus, C. lanuginosus and C. robustus. Habitually 1 is accompanied by different amounts of a more polar variant, apicularen B (2), which was identified as 11-O-(2-N-acetamido-2-deoxy-β-D-glucopyranosyl)apicularen. According to feeding experiments with 13C-labeled acetates, glycine, and methionine, apicularen A (1) is an acetate-derived polyketide containing a glycine residue as precursor of the enamine. Uncommonly, the C3 starter unit is not assembled from propionate but from acetate and methionine.
    Additional Material: 6 Ill.
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  • 96
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 1433-1441 
    ISSN: 1434-193X
    Keywords: Alkynes ; Annelation reactions ; Carbonyl compounds ; Heterocycles ; Polycycles ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---Upon condensation of ortho-phenylenediamine (2) with ortho-alkynylbenzaldehydes in nitrobenzene, oxidative cyclizations are observed, which result in benzimidazo[2,1-a]isoquinolines (8) or isoindolo[2,1-a]quinoxalines (9) depending on the influence of additional substituents at the alkyne.
    Additional Material: 1 Ill.
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  • 97
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 1443-1449 
    ISSN: 1434-193X
    Keywords: Amino acids ; Alkylations ; Phase-transfer catalysis ; Asymmetric synthesis ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---N-(2-Nitrophenylsulfonyl)- (o-NBS-AA-OMe, 4) and N-(4-Nitrophenylsulfonyl)-α-amino acid methyl esters (p-NBS-AA-OMe, 5) were N-alkylated with a variety of alkyl halides 6 under solid-liquid phase-transfer catalysis (SL-PTC) conditions, affording the alkylated products o-NBS-N-R2-AA-OMe 7 and p-NBS-N-R2-AA-OMe 8 in excellent yields without any detectable racemization.
    Additional Material: 3 Tab.
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  • 98
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 1451-1456 
    ISSN: 1434-193X
    Keywords: Mutolide ; Metabolites, secondary ; Macrolide ; Chemical screening ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---The 14-membered macrolide, mutolide (1), was discovered by chemical screening of the culture broth of the fungus F-24′707y, obtained after UV mutagenesis of the wild type strain, which normally produces the spirobisnaphthalene cladospirone bisepoxide (2). The structure of 1 was established by detailed spectroscopic analysis, X-ray analysis and derivatisation. The biogenetic origin of the carbon skeleton and the hydroxy groups was verified by feeding sodium [1-13C]acetate and 18O2 to growing cultures of the fungus. Macrolide 1 is generated from acetate/malonate only. The unexpected change of the normal metabolite pattern of this strain is discussed, and proves the value of the OSMAC method.
    Additional Material: 2 Ill.
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  • 99
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 1457-1465 
    ISSN: 1434-193X
    Keywords: Sulfoximines ; Oxidative cleavage ; Sulfones ; Polymer-bound sulfoximines ; Solid-phase synthesis ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---Reaction of N-alkyl, N-aryl, and N-H sulfoximines with m-chloroperbenzoic acid cleanly gives the corresponding sulfones in high yield. In the case of the cleavage of N-alkyl and N-arylsulfoximines, formation of the corresponding nitroso compounds as the other reaction product was proven. Starting from enantio- and diastereopure sulfoximines, a number of chiral sulfones, including the axially chiral sulfone 6 and the sulfonyl-functionalized homoallylic alcohol 8, have been prepared. Reaction of the enantiopure sulfoximine 30 with Merrifield resin gave the polymer-bound sulfoximine 32. Oxidative cleavage of 32 afforded the sulfone 16 in high yield. Deprotonation of the sulfoximine resin 32 and reaction of Li-32 with benzaldehyde and propanal furnished the β-hydroxysulfoximine resins 33a and 33b, respectively. Oxidative cleavage of 33a and 33b readily afforded the β-hydroxy sulfones 14a and 14b, respectively.
    Additional Material: 1 Ill.
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  • 100
    ISSN: 1434-193X
    Keywords: Glycosyl phosphates ; Nucleosidephosphate sugars ; Neuraminic acid ; Glycosyltransferase ; Carbohydrates ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---The reaction of sialyl phosphites 1, 22a-d, 28, 39, and 45 with acyl-protected riboside 5-phosphorous acids 2a,b and 23 directly furnished, without addition of a catalyst, under phosphite/phosphate exchange the corresponding β-configured sialyl riboside monophosphates 3a,b, 24a-d, 29, 46, and 47. The synthesis of the starting materials, formation of the products, and their treatment with sodium methanolate in methanol and subsequent hydrolysis of the sialic acid ester moiety to provide the unprotected target molecules 4a,b, 25a-d, 30, 48, and 49 is described. Investigations with α(2-6)-sialyltransferase from rat liver showed that base replacement in CMP-Neu5Ac (4a,b) is not tolerated by the enzyme but that modifications of the 5-, 8-, or 9-position of the neuraminic acid residue (25a-d, 30, 48, 49) are tolerated.
    Additional Material: 1 Tab.
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