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  • 11
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 338-342 (May 2000), p. 805-808 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 12
    ISSN: 1433-0385
    Keywords: Keywords: Insulinoma – Multiple adenomas – Reoperation – Localization diagnostics – Arterial stimulation and venous sampling (ASVS). ; Schlüsselwörter: Insulinom – multiple Adenome – Reoperation – Lokalisationsdiagnostik – intraarterieller Calciumstimulationstest (ASVS).
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung. Einleitung: Etwa 10 % aller Insulinome – dem häufigsten endokrinen Pankreastumor – sind multiple Tumoren des Pankreas (z. B. multiple endokrine Neoplasie Typ I) oder präsentieren sich selten als Inselzellhyperplasie. In weiteren ca. 10–15 % der Fälle sind die Tumoren bei der Diagnosestellung maligne. Für diese speziellen Patientengruppen und Patienten mit einer Reoperation ist eine präoperative Lokalisationsdiagnostik aufgrund möglicher Schwierigkeiten bei der intraoperativen Lokalisation der Tumoren anzustreben. Die bildgebenden Verfahren, wie die Computertomographie (CT), Kernspintomographie (MRT), Ultraschall und Octreotidszintigraphie, sind in der Lokalisation oft unzureichend. Methoden: Diese Studie zeigt unsere Erfahrungen mit dem intraarteriellen Calciumstimulationstest (ASVS) zur regionalen Lokalisierung und dem operativen Management des Insulinoms bei Patienten mit einem Reeingriff aufgrund eines Rezidivs bzw. einer persistierenden Erkrankung oder eines malignen Insulinoms bzw. Patienten mit einer abdominellen Voroperation. Ergebnisse: Für alle 3 Patienten konnte der funktionelle ASVS die richtige präoperative Regionalisierung des Insulinoms diagnostizieren und war damit der präoperativen bildgebenden Diagnostik überlegen. Schlußfolgerung: In Übereinstimmung mit der aktuellen Literatur ist der ASVS eine sehr sensitive ( 〉 90 %) und wenig invasive Methode zur präoperativen Regionalisierung von Insulinomen. Für Patienten mit einem Reeingriff sollte dem ASVS der Vorzug gegenüber den verschiedenen, in der Summe kostenintensiven präoperativen Diagnostikverfahren gegeben werden.
    Notes: Abstract. Background: Approximately 10 % of all insulinomas – the most common neuroendocrine pancreatic tumor – occur in multiple sites of the pancreas (e.g., multiple endocrine neoplasia type I) and rarely as islet cell hyperplasia. Malignant insulinomas appear in 10 % to 15 % of cases. For these special groups and for patients with a reoperation preoperative localization of the tumour is advisable. With current imaging technology, including computed tomography (CT), magnetic resonance imaging (MRI), ultrasonography, and somatostatin receptor scintigraphy (SRS), localization of insulinomas is often inadequate. Methods: In this study we report our results using intra-arterial calcium-stimulated venous blood sampling (ASVS) to localize and guide the management of insulinomas for patients with a reoperation because of recurrent insulinomas or persistent hyperinsulinism, for patients with malignant neoplasm and for patients with a previous abdominal operation. Results: For all three cases the insulinomas were correctly localized by the ASVS in contrast to the preoperative imaging studies. Conclusions: Our expierence and a review of the current literature demonstrate that ASVS is a highly accurate (sensitivity 〉 90 %) and a safe method for preoperative localization of insulinomas. For patients with a reoperation ASVS is recommended and the extensive use of other costly preoperative methods should be avoided.
    Type of Medium: Electronic Resource
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  • 13
    ISSN: 1433-0385
    Keywords: Keywords: IRM ; Surgery of the thyroid gland ; Surface electrode ; Routine monitoring. ; Schlüsselwörter: IRM ; Schilddrüsenchirurgie ; Oberflächenelektrode ; Routinemonitoring.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung. In den letzten Jahren haben sich im wesentlichen 2 unterschiedliche Verfahren des Recurrensmonitorings durchgesetzt: Zum einen die Ableitung von spontanen bzw. evozierten Potentialen mit Hilfe von endoskopisch applizierten Stichelektroden, die in die Kehlkopfadduktoren gestochen werden, zum anderen die zunehmende Verwendung nicht-invasiver Elektroden. Letztere können entweder in Form spezieller Tuben mit integrierten Elektroden oder, wie im Fall der Postcricoidelektrode, in Form von getrennt zum Tubus in die Rachenhinterwand einzubringender Elektroden Anwendung finden. Eine neue Möglichkeit stellt die, von uns in dieser Arbeit beschriebene, an den Tubus anzuklebende Oberflächenelektrode dar. Während der Untersuchungsperiode mit dem intraoperativen Recurrens Monitoring (IRM) betrug bei allen Operationen und Indikationen die Häufigkeit permanenter Paresen 1/174 (0,6 %). Den Vorteil des IRM sehen wir im wesentlichen auch in der schnelleren und sicheren Erkennung des N. laryngeus recurrens; das intraoperative Recurrensmonitoring kann und soll eine schonende und sichere Operationstechnik nicht ersetzen. Wir schlußfolgern, daß das intraoperative Recurrensmonitoring mit Hilfe einer Oberflächenelektrode, die am Tubus festgeklebt wird, eine sichere, zuverlässige und wenig invasive Methode ist, um intraoperativ den N. recurrens zu überwachen.
    Notes: Abstract. In recent years, two methods of intraoperative monitoring of the laryngeal nerve have mostly been used: evoked electromyographic responses via endscopically applied needle electrodes inserted into the adducting laryngeal muscles, and non-invasive electrodes like special tubes with integrated electrodes or separately insertable electrodes like the postcricoid electrode or disposable electrodes attached to the tube, as used in this study. The incidence of recurrent nerve paresis or paralysis during the IRM period was 1/174 nerves (0.6 %). The advantage of the IRM is the quick and certain identification of the nerve; intraoperative monitoring cannot replace a proper surgical technique. We conclude that the IRM, using a laryngeal surface electrode attached to the tube, is a safe and reliable method.
    Type of Medium: Electronic Resource
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  • 14
    Electronic Resource
    Electronic Resource
    Springer
    Der Ophthalmologe 97 (2000), S. 482-486 
    ISSN: 1433-0423
    Keywords: Schlüsselwörter Silikonölchirurgie ; komplizierte Ablatio retinae ; Kindesalter ; Key words Silicone oil surgery ; Complicated retinal detachment ; Juveniles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract Background. The purpose of this study was to evaluate anatomical and functional results of vitreoretinal silicone oil surgery for complicated retinal detachments due to trauma and myopia in children and juveniles. Methods. We retrospectively reviewed the records of children and juveniles up to 17 years of age who had undergone vitreoretinal surgery with silicone oil instillation for the above causes between 1990 and 1997. A total of 30 eyes of 29 patients were operated on, 24 because of trauma and the remaining 6 because of retinal detachment in high myopia. There was a mean postoperative follow-up period of 1.7 years. Silicone oil could be removed from 18 of the 30 eyes after a mean of 4.7 months. The median number of vitrectomies performed per eye was two (range one to five). Results. In 21 of 30 eyes (70%) the retina could be reattached after one or more surgeries. Silicone oil was removed from 16 of these 21 eyes (53%) which was defined as anatomical success. Visual acuity increased (14 eyes, 48.3%) or remained unchanged (9 eyes, 31%) in 23 of 29 eyes (79.3%). Visual acuity decreased in 6 of 29 eyes (20.7%) despite surgery. Two eyes (6.7%) had to be enucleated due to bulbar phthisis. Seventeen eyes reached a postoperative visual acuity of at least counting fingers. In one child functional tests could not be performed due to young age. Conclusion. Vitreoretinal surgery with silicone oil endotamponade has become a standard procedure in treating complicated retinal pathologies in children and juveniles. In very young patients it is thought that silicone oil instillation has advantages over gas endotamponade since it is very difficult for children to keep the proper face-down positioning after the procedure. The retinal reattachment rate is encouraging. In the majority of cases visual acuity greater than or equal to counting fingers and thus orienting vision was reached postoperatively. In few cases even reading vision was regained.
    Notes: Zusammenfassung Hintergrund. Ziel dieser Untersuchung war die Evaluation der vitreoretinalen Silikonölchirurgie im Kindes- und Jugendalter bei komplizierten Netzhautablösungen infolge Traumata und hohen Myopien. Methode. Wir führten eine retrospektive Untersuchung der an der Universitäts-Augenklinik Marburg bei Kindern und Jugendlichen bis 17 Jahre vorgenommenen vitreoretinalen Eingriffe mit Silikonölinstillation durch. In den Jahren 1990 bis 1997 wurden insgesamt 30 Augen von 29 Patienten operiert, 24 wegen eines Traumas und 6 mit komplizierten Netzhautablösungen bei hoher Myopie. Der Nachbeobachtungszeitraum betrug im Mittel 1,7 Jahre. Aus 18 der 30 Augen konnte das Silikonöl nach durchschnittlich 4,7 Monaten wieder entfernt werden. Im Durchschnitt wurden 2 Pars-plana-Vitrektomien pro Auge durchgeführt. Ergebnisse. Bei 21 von 30 Augen (70%) konnte die Netzhaut durch einen oder mehrere Eingriffe zur Anlage gebracht werden. Bei 16 dieser 21 Augen (53%) konnte das Silikonöl wieder entfernt werden, was als anatomischer Erfolg definiert wurde. Bei 23 der 29 Augen (79,3%) stieg der Visus an oder blieb unverändert (14 versus 9 Augen; 48,3% versus 31%). Der Visus fiel bei 6 von 29 Augen (20,7%) trotz Operation ab. 2 Augen (6,7%) davon mussten auf Grund einer Phthisis enukleiert werden. 17 Augen erreichten einen postoperativen Visus von mindestens Fingerzählen (FZ bis 0,5). Bei einem Kind konnten auf Grund des geringen Alters keine Visusprüfung erfolgen. Schlussfolgerung. Die Pars-plana-Vitrektomie mit Silikonölendotamponade ist mittlerweile ein Standardverfahren zur Behandlung der oben genannten komplizierten Netzhautpathologien im Kindes- und Jugendalter. Ein Vorteil gegenüber der Gasendotamponade ist die postoperativ nicht zwingend notwendige Gesichtstieflage, wozu Kinder nur schwer anzuhalten sind. Die anatomische Erfolgsquote, d. h. die Rate der wieder angelegten Netzhäute ist ermutigend. In einem Großteil der Fälle zeigen die funktionellen Ergebnisse einen Visus von Fingerzählen oder darüber und ermöglichen zumindest orientierendes Sehen. In einigen Fällen wird nach schwersten Netzhautveränderungen sogar wieder ein Lesevisus erreicht.
    Type of Medium: Electronic Resource
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  • 15
    Electronic Resource
    Electronic Resource
    Springer
    Archives of orthopaedic and trauma surgery 120 (2000), S. 100-102 
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Fat embolic phenomena during cemented and non-cemented total hip arthroplasty occur even during the preparation of the femoral canal. This should be avoided in order to reduce the rate of fat embolic syndrome. In the present prospective study we demonstrate the benefit of cannulated awls and rasps in the reduction of fat embolic phenomena by means of transoesophageal echocardiography and extended cardiopulmonary monitoring. Two groups of 5 patients each with identical surgical procedures were treated either with cannulated (group 1) or with closed (group 2) awls and rasps. In group 1 no macroemboli but three embolic showers grades 1 and 2 were seen. In contrast to these findings, three macroemboli and four embolic showers grades 1 and 3 were demonstrated in group 2. We recommend cannulated awls and rasps for the preparation of the femoral canal in cemented and non-cemented total hip arthroplasty. They are a simple and inexpensive aid to avoid fat embolic syndrome.
    Type of Medium: Electronic Resource
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  • 16
    Electronic Resource
    Electronic Resource
    Springer
    Czechoslovak journal of physics 50 (2000), S. 1043-1050 
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A capillary plasma Z-pinch as an alternative active medium of soft X-ray lasers was studied experimentally and theoretically. The theoretical analysis was based on the self-consistent solution of the so called “snow-plow” model of plasma pinch together with feeding double-resonance circuit. The calculated development of the current as well as the evaluated pinch time are in good agreement with the measured ones. The experimental pinch time was evaluated from the time-resolved measurement of broad band soft X-ray emission.
    Type of Medium: Electronic Resource
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  • 17
    Electronic Resource
    Electronic Resource
    Springer
    Heat and mass transfer 36 (2000), S. 165-171 
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract  Extensive measurements of the intensive cooling of hot-rolled wires with temperatures between 1000 °C and 1100 °C are analysed. The analysis proves the existence of a convection-controlled boiling region, which has been previously observed by few authors in the case of high mass fluxes and high liquid subcooling. This region is characterised by an independence of the heat flux of the surface temperature. The heat flux depends essentially on the Reynolds number, the main influence parameter of the single phase convection, and on the liquid subcooling.
    Type of Medium: Electronic Resource
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  • 18
    ISSN: 1432-1238
    Keywords: Key words Procalcitonin ; PCT ; Elimination ; Renal dysfunction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Objective: Procalcitonin (PCT) plasma concentrations and its kinetic can be used as a diagnostic tool in critically ill patients and patients with sepsis. Since renal dysfunction is a frequent complication in these patients, and PCT is a protein with a low molecular weight, we have measured the half-life time of PCT after peak concentrations in patients with normal and impaired renal function. We also have analyzed the influence of patients age and gender on PCT elimination kinetic.¶Design: Prospective clinical study. Renal dysfunction was assessed by plasma creatinine. The half-life time of PCT was evaluated 24 and 48 h after acute induction of PCT, when the focus of PCT induction has rapidly been eliminated.¶Setting: Intensive care unit of our University hospital, a tertiary health care institution.¶Patients: 69 patients were included into the study.¶Interventions: None.¶Measurements and results: The half-life-time of PCT was not significantly altered during renal dysfunction (26.1–33.1 h, 25–50 percentiles, creatinine clearance 〈 30 ml/min) when compared with normal renal function (22.3–28.9 h). It neither correlated with creatinine clearance (p = 0.14), nor age (p = 0.99) or gender (p = 0.90, Pearson product-moment correlation).¶Conclusions: The data of the present study demonstrate that assement of PCT kinetic can also be used for diagnostic and prognostic reasons in patients with renal dysfunction. It may, however, exceed 24 h also in patients with normal renal function. As to the present knowledge, renal secretion does not contribute as a main pathway to PCT elimination.
    Type of Medium: Electronic Resource
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  • 19
    Electronic Resource
    Electronic Resource
    Springer
    Heat and mass transfer 36 (2000), S. 117-126 
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract  Heat and mass transfer in arc and beam welding is considered. The main objectives are analysis of the heat transfer in the weld pool and the workpiece and to demonstrate how computer simulation can be used as a tool to predict the temperature distribution as the determining element of the heat effects of welding. Simulation results of two particular welding processes are compared and validated with measurements.
    Type of Medium: Electronic Resource
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  • 20
    Electronic Resource
    Electronic Resource
    Springer
    Heat and mass transfer 36 (2000), S. 265-271 
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract On the basis of experimental investigations, a model is derived, which describes the momentum and the heat transfer in the region of convection-controlled film boiling. The model considers the slip of the liquid flow at the hot wall surface and the influence of the movement of the vapour/liquid interface on the heat transfer using measurements of intensive cooling of fast moving wires. The description of the influence of liquid subcooling is based on measurements of Huang [1]. The proposed model is suitable for predicting the pressure drop and heat transfer well in cases of similar conditions. It therefore can be used in designing tools for cooling lines.
    Type of Medium: Electronic Resource
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