Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    Histopathology 45 (2004), S. 0 
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Aims:  To report five malignant trichogenic tumours arising in longstanding, previously benign adnexal neoplasms through malignant transformation. Malignant trichogenic adnexal tumours are extremely rare neoplasms.Methods and results:  The patients were between 55 years and 79 years of age. Three of the tumours were located on the arms, two on the face. Three of our patients had a history of chronic lymphocytic leukaemia, one patient had a history of colonic adenocarcinoma. The duration of the tumour nodules was reported as between 20 and 40 years before sudden changes occurred. These changes included rapid growth, pain, itching, ulceration and bleeding. Histologically, all tumours were well circumscribed and encapsulated. There was a residual benign tumour component and morphological signs such as bone formation, dystrophic calcification and sclerosis suggesting long duration of the lesions. All patients except for one, who refused further clinical investigation due to her advanced age of 79 years, had an underlying systemic malignancy.Conclusions:  The growth stimulus in these benign adnexal neoplasms resulting in malignant transformation may be attributed to the acquisition of additional genetic events or to immunosuppression due to an underlying neoplastic disease. Therefore, patients with systemic diseases or malignancy should be carefully examined and followed for sudden changes in pre-existing benign cutaneous tumours.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    Histopathology 45 (2004), S. 0 
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Aims : To analyse 90 vulvar and 72 penile cases of lichen sclerosus (LS) on haematoxylin and eosin sections for vascular changes and the vascular infiltrates immunohistochemically with antibodies to T cells, B cells and antigen-presenting dendritic cells. LS is a skin disease of presumed autoimmune origin. Autoimmune diseases are mediated by lymphocytes which occasionally produce a lymphocytic vasculitis.Methods and results : Three types of lymphocytic infiltrates were identified: (i) perivascular lymphocytic infiltrates without damage to vessel walls; (ii) lymphocytic vasculitis in three forms: (a) concentric lymphohistiocytic infiltrates with lamination of the adventitia by basement membrane material which was typical for penile LS; (b) lymphocytic vasculitis with dense perivascular lymphocytic cuffing with occasional fibrin deposition in vessel walls and subendothelial lymphocyte infiltration, quite common in vulvar LS; and (c) intramural lymphocytic infiltrates in large muscular vessels; (iii) leukocytoclastic vasculitis in LS was exceptionally rare. In lymphocytic vasculitis, CD20+ B cells, CD4+ T cells and dendritic cells were the principal infiltrating cells.Conclusions : Dendritic cells capture (foreign) antigens after entry into the affected tissues and initiate immune responses acting as a matrix on which antigen-specific T and B cells interact. The described vascular features are indicative of antigen-mediated vasculitic changes in LS.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 189 (1966), S. 365-384 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We give a fully quantum mechanical treatment of the dissipation and fluctuation of aN-level system coupled to a short memory loss and pumping reservoir which may describe the optical pumping and the spontaneous emission as well as phonon interaction. A general procedure for eliminating the reservoir coordinates is developed where all interesting reservoir properties enter into some phenomenological constants describing a Markov process. General quantum mechanical expectation values are written in terms of a Wigner transition probability distribution for which a Fokker-Planck equation is stated. From that a quantum mechanical Langevin equation can be derived in a straightforward way. The Bloch equations follow by averaging over the reservoir fluctuations. The dissipation and fluctuation coefficients are calculated explicitly in all orders of perturbation theory for aN-level system. In the special case of 2 levels they contain the results ofSauermann who uses a disentangling method. Several connections between relaxation and noise are found, one of these results being equivalent to results ofHaken andWeidlich in a simultaneous paper, found by a different method in the full Heisenberg picture.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 193 (1966), S. 37-51 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In order to describe quantum fluctuations a general method is developed, which also may be applied to nonstationary systems as well as to states far from thermodynamic equilibrium. After a concise derivation of the master equation quantum mechanically determined dissipation and fluctuation coefficients are introduced, for which several theorems and relations are given. By using these coefficients there is set up a general Fokker-Planck equation for the diffusion of the statistical operator due to quantum fluctuations.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 194 (1966), S. 337-359 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract As an application of a preceding paper we set up a Fokker-Planck equation with quantum mechanically defined dissipation and fluctuation coefficients for a distribution function of the atomic variables (dipole moments and level occupation numbers) as well as of the lasing light amplitude in a laser with a homogeneously broadened line. Since the nonlinear coefficients can be linearized in appropriate coordinates well below and well above threshold, the equation can be solved with the Wang-Uhlenbeck method. Then it is easy to obtain correlation functions, spectral densities and expressions for linewidth.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    ISSN: 1432-0827
    Keywords: Key words: Osteoporosis — Heart transplantation — Calcitriol — Calcitonin — Pamidronate.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. Bone loss and osteoporotic fractures are common in cardiac transplant recipients. To compare two prophylactic medical regimens after heart transplantation, 26 consecutive heart transplant recipients were randomized to receive either continuous oral calcitriol (0.5 μg/day) combined with nasal salmon calcitonin (200 U/day) for the first 3 months (group A) or intermittent intravenous pamidronate (0.5 mg/kg body weight) every third month (group B). Bone mineral density (BMD) and biochemical indices of bone turnover were measured at baseline and 3, 6, 12, and 18 months after transplantation. The mean pretransplant BMD, measured by dual energy X-ray absorptiometry (DXA) was significantly lower in the patients compared with age-matched healthy controls. During the first year of treatment, rates of bone loss at the lumbar spine and femoral neck were slightly but significantly slower in the patients treated with pamidronate, but there was no longer a significant difference between the two groups after 18 months of heart transplantation. Irrespective of the mode of osteoporosis prevention, osteocalcin levels increased whereas urinary deoxypyridinoline decreased after transplantation, and significant bone loss was observed in both treatment groups. We found no relationship between initial BMD, markers of bone turnover, cumulative glucocorticoid dose, or cyclosporine levels and the rate of bone loss after cardiac transplantation. In summary, we found that the rapid and severe bone loss following heart transplantation could be attenuated by two preventive measures, pamidronate or calcitriol with calcitonin.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    ISSN: 1433-044X
    Keywords: Schlüsselwörter Pertrochantäre Fraktur ; Dynamische Hüftschraube ; Instabile Frakturen ; Komplikationen ; Keywords Trochanteric fracture ; Dynamic hip screw (DHS) ; Instable fractures ; Complications
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract The aim of all surgical procedures in the treatment of trochanteric fractures in elderly and even geriatric patients is achievement of initial stability. We examined in a clinical trial whether primary stability was achieved in all types of trochanteric fractures following osteosynthesis with the Dynamic Hip Scres (DHS). From 1994 to 1996, 122 patients with trochanteric fractures had osteosynthesis by dynamic hip screw. Patient records were evaluated and all data got registered with a standardized protocoll; clinical and radiological outcome was analysed after an average period of 1,9 years after injury according to the Traumatic Hip Rating Score. 22% of all patients died meantimes, 51,6% of the remaining 95 patients could get examined. The average age was 75,5 years, the patient population showed an increased preoperative morbidity (2,5 points) according to ASA-Score. 81% showed progressive osteoporosis. According to the AO-classification 47% stable fractures (type A-1) and 53% instable trochanteric fractures (type A-2 and A-3) occured. Surgery lasted 77 minutes average in osteosynthesis of stable fractures. The duration of 108 minutes in instable fractures was significantly higher, as well as the blood loss was 43% increased in these complex fractures. Complications closely associated to the osteosynthesis appeared only in instable fractures (7%). Also common complications (24,6%) predominated with 15,6% in tpy A-2 and A-3 fractures versus 9% in type A-1 fractures; mortality was also different with 5,7% versus 1,6%. Assesment of the functional outcome according to THRS showed a significant deterioration of 20 points in 71% of all patients compared with the preoperative score. The results show that dynamic hip screw osteosynthesis in instable trochanteric fractures is associated to a higher incidence of complications. While the dynamic hip screw still represents the standard implant in stable fractures of the trochanteric regio, beeing aware of improved intramedullary implants regarding biomechanical features and surgical technique, the results justify to critical consider the use of DHS for osteosynthesis in instable fractures of the trochanteric region.
    Notes: Zusammenfassung Bei der operativen Versorgung petrochantärer Femurfrakturen im geriatrischen Krankengut stellt eine sofort übungs- und belastungsstabile Osteosynthese das Therapieziel dar. In einer klinischen Studie wurde vergleichend untersucht, ob dieses Ziel mit der DHS (dynamische Hüftschraube) bei allen pertrochantären Frakturtypen erreicht werden kann. Von 1994–1996 wurden 122 pertrochantäre Frakturen mit der DHS behandelt. Neben der Auswertung durch standardisierte Datenerhebungsprotokolle wurden die Patienten durchschnittlich 1,9 Jahre nach Trauma radiologisch und klinisch nach dem “Traumatic hip rating score” nachuntersucht; 22% waren verstorben, von den verbliebenen 95 Patienten konnten 51,6% nachkontrolliert werden. Bei einem Altersdurchschnitt von 75,5 Jahren lag mit dem ASA-Score von durchschnittlich 2,5 Punkten eine hohe präoperative Morbidität vor; 81% der Fälle wiesen eine fortgeschrittene Osteoporose auf. Nach der AO-Klassifikation handelte es sich um 47% stabile (Typ A1) und 53% instabile (Typ A2 und A3) Frakturen. Die mittlere Operationszeit war bei den instabilen im Vergleich zu den stabilen pertrochantären Frakturen mit 108 gegenüber 77 min signifikant höher, der Blutverlust um 43% größer. Direkt mit der Osteosynthese assoziierte Komplikationen betrafen ausschließlich instabile Frakturen (7%). Allgemeine Komplikationen (24,6%) überwogen ebenfalls mit 15,6% in der Gruppe der Typ A2 und A3 gegenüber der Typ-A1-Frakturen, was sich auch in einer entsprechend höheren Klinikletalität mit 5,7% gegenüber 1,6% ausdrückt. Bei der Bewertung des funktionellen Nachuntersuchungsergebnisses mit dem THRS wiesen 71% der Patienten im Vergleich zum präoperativen Ausgangswert eine deutliche Verschlechterung um durchschnittlich 20 Punkte auf. Die Osteosynthese instabiler pertrochantärer Femurfrakturen durch die DHS ist mit einer höheren Komplikationsrate belastet. Während die DHS für die stabilen Frakturen das Standardverfahren darstellt muss die Osteosynthese instabiler Frakturen vor dem Hintergrund neuerer, operationstechnisch und biomechanisch verbesserter intramedullärer Implantate kritisch betrachtet werden.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    ISSN: 1432-0584
    Keywords: Keywords BEAM ; Mucosa-associated lymphoid tissue ; Marginal zone B-cell lymphoma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Due to their homing properties, extranodal marginal zone B-cell lymphoma (MZBL) of mucosa-associated lymphoid tissue (MALT) type remain localized for long periods of time, and therefore have an excellent prognosis. However, if generalization and/or transformation into a diffuse large-cell lymphoma occurs, the prognosis deteriorates and no established treatment concepts are yet available. We report about a 57-year-old female patient with relapsed transformed stage-IV extranodal MZBL of MALT type of the entire gastrointestinal tract who was successfully treated using salvage chemotherapy followed by BEAM conditioning [BCNU 1,3-bis-2-(chloroethyl-1-nitrosourea), etoposide, cytosine arabinoside, and melphalan] and autologous peripheral stem cell transplantation. Follow-up revealed a sustained complete remission for 22 months.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    ISSN: 1432-0584
    Keywords: Key words Acute myelofibrosis ; Acute megakaryoblastic leukemia ; Scintigraphy ; Magnetic resonance imaging ; Interferon gamma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Acute myelofibrosis is a rare, malignant hematological disorder of unknown etiology with an inevitably fatal outcome. Here we present the study of a 63-year-old Caucasian man with acute onset of pancytopenia. Repeated bone marrow biopsies showed dense fibrosis and hypoplastic hematopoiesis raising various differential diagnoses of malignant and nonmalignant conditions. Bone marrow scintigraphy and magnetic resonance imaging (MRI) showed areas suggesting neoplastic infiltration, mainly in both femurs and tibias. Histological examination of a surgical biopsy of the left tibia revealed acute megakaryoblastic leukemia. As the patient refused polychemotherapy, therapy with interferon gamma was initiated but discontinued prematurely because of intolerable side effects. The presented case therefore suggests that the combination of bone marrow scintigraphy and MRI is a valuable diagnostic tool in patients presenting with myelofibrosis of unknown origin.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 10
    ISSN: 0930-9225
    Keywords: Schlüsselwörter Schlaf-Apnoe-Syndrom ; Herzchirurgie ; Operationsrisiko ; Anästhesierisiko ; Key words Sleep apnoea syndrome ; cardiac surgery ; anesthetic risk ; operative risk
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The operative and anesthetic risk of patients suffering from sleep apnoea syndrome is generally considered to be elevated because of frequent concomitant disease such as obesity and hypertension and side effects of sedative, anesthetic and analgesic agents. Cardiac surgery with extracorporeal circulation leads to lung edema and may therefore aggravate complications of the respiratory tract. We performed this study to verify, if the operative and anesthetic risk of patients, suffering from sleep apnoea syndrome and undergoing cardiac surgery, is really elevated.    Between September 1994 and December 1996 ten male patients suffering from sleep apnoea syndrome underwent aortocoronary bypass grafting with extracorporeal circulation. Preoperatively we analyzed symptomatology, predisposing factors, concomitant diseases and medication. Perioperatively we were interested in respiratory and hemodynamic function, anesthetic management and complications beside the common operative parameters.    All patients were obese and four patients were treated medically for hypertension. The anesthetic management was the same as used in other routine cardiac patients. Neither induction of anesthesia nor weaning from the respirator led to respiratory complications. Postoperatively we had to implant an intraaortic balloon counterpulsation in two patients because of left ventricular dysfunction in order to stabilize hemodynamics. We removed it in both patients without complications on the second postoperative day after catecholamine therapy had been stopped.    Patients suffering from sleep apnoea syndrome are not at increased risk for respiratory and hemodynamic complications when undergoing cardiac surgery with extracorporeal circulation.
    Notes: Zusammenfassung Das Operations- und Anästhesierisiko von Patienten mit einem Schlaf-Apnoe-Syndrom wird aufgrund der häufigen Begleiterkrankungen (z.B. Adipositas, arterielle Hypertonie) und den Nebenwirkungen der Sedativa, Anästhetika und Analgetika allgemein als erhöht beurteilt. Bei kardiochirurgischen Eingriffen mit Hilfe der extrakorporalen Zirkulation können respiratorische Komplikationen durch Flüssigkeitseinlagerung in die Lunge aggraviert werden. Wir führten diese Studie durch, um zu untersuchen, ob das Operations- und Anästhesierisiko bei Patienten mit Schlaf-Apnoe-Syndrom, bei denen herzchirurgische Eingriffe mit Hilfe der extrakorporalen Zirkulation erforderlich sind, tatsächlich erhöht ist.    Im Zeitraum vom 1.9.94 bis 31.12.96 wurde bei 10 männlichen Patienten mit einem Schlaf-Apnoe-Syndrom eine aortokoronare Bypass-Operation durchgeführt. Präoperativ wurden die klinische Symptomatik der Patienten, prädisponierende Faktoren, Begleiterkrankungen und Medikation untersucht. Perioperativ interessierten wir uns neben den üblichen operativen Daten besonders für das Anästhesiemanagement, die respiratorischen und hämodynamischen Parameter sowie die Komplikationen.     Alle Patienten waren adipös, bei vier Patienten bestand eine medikamentös behandlungsbedürftige Hypertonie. Das Anästhesiemanagement unterschied sich nicht von dem, das üblicherweise bei Patienten mit herzchirurgischen Eingriffen in unserem Hause angewandt wird. Sowohl während der Narkoseeinleitung als auch während der Entwöhnung vom Respirator und während des weiteren postoperativen Verlaufs traten keine respiratorischen Komplikationen auf. Bei zwei Patienten war die Implantation einer intraaortalen Ballon-Pumpe aufgrund einer postoperativen linksventrikulären Dysfunktion zur hämodynamischen Stabilisierung erforderlich. Bei beiden Patienten konnte diese am zweiten postoperativen Tag nach Beendigung der Katecholamintherapie komplikationslos wieder entfernt werden.    Herzchirurgische Eingriffe unter Zuhilfenahme der extrakorporalen Zirkulation können bei Patienten mit Schlaf-Apnoe-Syndrom ohne erhöhtes Risiko an respiratorischen und hämodynamischen Komplikationen durchgeführt werden.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...