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  • 2000-2004  (26)
  • 1985-1989  (38)
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  • 1
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    German Medical Science; Düsseldorf, Köln
    In:  68. Jahrestagung der Deutschen Gesellschaft für Unfallchirurgie, 90. Tagung der Deutschen Gesellschaft für Orthopädie und Orthopädische Chirurgie und 45. Tagung des Berufsverbandes der Fachärzte für Orthopädie; 20041019-20041023; Berlin; DOC04dguK4-1840 /20041019/
    Publication Date: 2004-10-20
    Keywords: ddc: 610
    Language: German
    Type: conferenceObject
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  • 2
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    German Medical Science; Düsseldorf, Köln
    In:  Patientenbeteiligung bei medizinischen Entscheidungen; 2. Tagung des Förderschwerpunktes "Der Patient als Partner im medizinischen Entscheidungsprozess"; 20040325-20040327; Freiburg; DOC04pat20 /20040615/
    Publication Date: 2004-06-15
    Keywords: ddc: 610
    Language: German
    Type: conferenceObject
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  • 3
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    German Medical Science; Düsseldorf, Köln
    In:  Patientenbeteiligung bei medizinischen Entscheidungen; 2. Tagung des Förderschwerpunktes "Der Patient als Partner im medizinischen Entscheidungsprozess"; 20040325-20040327; Freiburg; DOC04pat21 /20040615/
    Publication Date: 2004-06-15
    Keywords: ddc: 610
    Language: German
    Type: conferenceObject
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  • 4
    ISSN: 1432-2323
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé La réaction périprothétique se définit comme une incompabilité biologique aseptique avec la prothèse vasculaire synthétique. Le tableu clinique se caractérise par une tuméfaction indolore et fluctuante autour de la prothèse; il s'agit de la collection d'un liquide stérile entouré d'une capsule fibreuse. Depuis 1979, on a observé et analysé 22 réactions périprothétiques survenues après l'implantation de 2,554 prothèses vasculaires. L'incidence de cette complication est donc d'environ 8/1,000, que la prothèse soit en Dacron® double-velours ou en polytétrafluoroéthylène expansé. De l'analyse de notre série et de celle de la littérature, il ressort que presque 75% des cas étaient des prothèses placées en position extra-anatomique. Le délai moyen entre l'implantation de la prothèse et les premiers signes cliniques était de 25 mois. Bien que l'étiologie exacte ne soit pas encore établie, la pathogénèse dépend probablement de multiples facteurs: (a) traumatismes dus aux mouvements continus de la prothèse dans les tissus environnants, surtout en cas de pontage extra-anastomotiques, (b) irritation physiochimique du lit tissulaire par le matériau de la prothèse (surface en velours, solvants organiques), et (c) mauvaise incorporation de la prothèse susceptible de provoquer la formation d'une cavité périprothétique et l'accumulation de liquide autour de la prothèse. Les causes infectieuses, immunologiques ou allergiques semblent avoir été éliminées. Le traitement consiste à remplacer complètement ou en partie la prothèse et a la remplacer par une prothèse d'un autre matériel synthétique at à pratiquer l'exérèse de la coque. Il faut proscrire les ponctions répétées en raison des taux élevées d'échecs et d'infections secondaires.
    Abstract: Resumen La reacción periprotésica puede ser definida como una incompatibilidad biológica aséptica de las prótesis vasculares sintéticas. El cuadro clínico se caracteriza por inflamación fluctuante e indolente alrededor de la prótesis, constituída por líquido estéril rodeado de una cápsula fibrosa. A partir de 1979, hemos observado 22 reacciones periprotésicas en 2,554 injertos vasculares, las cuales han sido estudiadas y analizadas. La incidencia de esta complicacíon es de alrededor de 8/1,000 tanto para el Dacron® double-velour como para el politetrafluoroetileno expandido. Incluyendo 306 reportes de la literatura, las prótesis en posiciones extraanatómicas comprenden el 75% del material analizado. El intervalo promedio entre la implantación del injerto y la manifestación clínica fue de 25 meses. A pesar de que la etiología aún no está aclarada, su patogénesis parece ser multifactorial: (a) aparece el trauma mecánico debido a un movimiento continuo de la prótesis en los tejidos vecinos (especialmente en el caso de injertos extraanatómicos), (b) aparece la irritación físicoquímica del lecho tisular por el material protésico mismo (superficie de velour, solventes orgánicos), y (c) la pobre incorporacíon del injerto puede dar lugar a la formación de un espacio periprotésico libre con acumulación de líquido a su alrededor. El tratamiento consiste en el reemplazo total o parcial de la porción afectada del injerto y de la pared del quiste periprotésico por una prótesis de diferente material sintético. La aspiration repetida del quiste periprotésico debe ser evitada por su escasa tasa de éxito y por el peligro de infeccíon secundaria.
    Notes: Abstract Perigraft reaction can be defined as an aseptic biological incompatibility of synthetic vascular prostheses. The clinical picture is characterized by an indolent fluctuating swelling around the prosthesis, consisting of sterile fluid surrounded by a fibrous capsule. Since 1979, a total of 22 perigraft reactions in 2,554 implanted vascular grafts were observed and analyzed. The incidence of this complication is about 8/1,000 both for Dacron ® double-velour and expanded polytetrafluoroethylene (PTFE). Including 306 reports from the literature, prostheses in the extraanatomical position comprise nearly 75% of the material analyzed. The time interval between graft implantation and clinical manifestation is, on average, 25 months. Although the etiology is still unclear, the pathogenesis is supposed to be multifactorial: (a) there is mechanical trauma due to continuous shifting of the prosthesis in the surrounding tissue (especially in the case of extraanatomic grafts), (b) there is physicochemical irritation of the tissue bed by the graft material (velour surface, organic solvents), and (c) poor incorporation of the graft may lead to periprosthetic gap formation and fluid accumulation around the prosthesis. Infections, or immunologic or allergic causes can be excluded. Therapy includes total or partial replacement of the affected portion of the graft and cyst wall with substitution by a prosthesis of a different synthetic material. Repeated aspiration of the periprosthetic cyst should be avoided because of the high failure rate and danger of secondary infection.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-2218
    Keywords: Periprosthetic fluid ; Perigraft reaction ; Vascular prosthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Ultrasonographic duplex scanning is used widely to screen the abdominal arterial system and to detect lesions in the extracranial cerebral arteries. Based on clinical studies of 11,712 vascular reconstructions, this report describes the early recognition of fluid accumulation around vascular prostheses. The clinical examination may suggest the typical complications that arise after vascular surgery such as hematoma, pseudoaneurysm, lymphocele, abscess, or perigraft cyst. Duplex scanning, combined with puncture and aspiration, proved to be of great benefit in differentiating the specific type and extent of the complication. Special attention is paid to the so-called perigraft reaction, thought to be a result of an aseptic biological incompatibility to synthetic vascular grafts. It is emphasized that ultrasonographic routine follow-up after vascular surgery is essential for early diagnosis, especially since each complication suspected requires specific therapeutic treatment to prevent exacerbation because of inadequate treatment.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0942-0940
    Keywords: Subarachnoid haemorrhage ; plasma renin activity ; sympathetic nervous system ; brainstem dysfunction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The possible relationship between plasma renin activity and neurological deficits was examined in ten patients with spontaneous subarachnoid haemorrhage in a prospective clinical study. The patients were examined daily, particular attention being given to signs of brain stem dysfunction. The degree of impaired consciousness was assessed using the Glasgow Coma Score. Plasma renin activity was determined on days 1–5, 7, 9, 11, 13, 15 and 21 after the initial bleeding episode using an Angiotensin-I-radioimmunoassay. Six of seven patients with signs of brain stem dysfunction displayed a marked increase in plasma renin activity. Thus a significant negative correlation between the degree of consciousness and the plasma renin activity resulted. An explanation for this correlation may be found in the localization of the autonomous centres and the high concentrations of renin in the hypothalamus and brain stem. The individual changes in plasma renin activity have prognostic significance, whereas single estimated plasma renin activities show great interindividual differences and have only limited prognostic value.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The aim of this study was to investigate the effects of different doses of exogenous recombinant human tissue plasminogen activator (rt-PA) on the endogenous cerebral plasminogen–plasmin system in focal ischemia in rats. Ischemia was induced using the suture model. Each group of rats (n = 6) received either treatment (0.9, 9 or 18 mg rt-PA/kg body weight) or saline (control group) at the end of ischemia; a sham-operated group was added. The activity of the plasminogen activators was measured by casein-dependent plasminogen zymography. In the cortex urokinase (u-PA) rose from sham (no ischemia), 91 ± 7% to ischemia, 176 ± 10% (P 〈 0.005). Increasing rt-PA doses led to further significant (P 〈 0.001) cortical u-PA activation which was maximal at 18 mg: 249 ± 13%. An extreme increase in the u-PA activity was observed in the basal ganglia to 1019 ± 22% (P 〈 0.001). This increase was further aggravated by higher rt-PA doses (18 mg, 1236 ± 15%; P 〈 0.001). The t-PA level did not change I3R24 during (3 h ischemia followed by reperfusion for 24 h); however, during low and moderate doses of rt-PA, endogenous t-PA was reduced. In conclusion, while ischemia leads to a significant increase in u-PA, mainly in the basal ganglia, t-PA is not altered. Increasing doses of rt-PA lead to a further elevation of u-PA. Thus, u-PA seems to play a major role in the endogenous plasminogen activator system following focal cerebral ischemia.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Principal neurons of the medial nucleus of the trapezoid body (MNTB) receive a synaptic input from a single giant calyx terminal that generates a fast-rising, large excitatory postsynaptic current (EPSC), each of which are supra-threshold for postsynaptic action potential generation. Here, we present evidence that MNTB principal neurons receive multiple excitatory synaptic inputs generating slow-rising, small EPSCs that are also capable of triggering postsynaptic action potentials but are of non-calyceal origin. Both calyceal and non-calyceal EPSCs are mediated by α-amino-3-hydroxy-5-methyl-4-isoxazole propionate (AMPA) and N-methyl-d-aspartate (NMDA) receptor activation; however, the NMDA receptor-mediated response is proportionally larger at the non-calyceal synapses. Non-calyceal synapses generate action potentials in MNTB principal neurons with a longer latency and a lower reliability than the large calyceal input. They constitute an alternative low fidelity synaptic input to the fast and secure relay transmission via the calyx of Held synapse.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Glutamate release in ischaemia triggers neuronal death. The major glial glutamate transporter, GLT-1, might protect against glutamate-evoked death by removing extracellular glutamate, or contribute to death by reversing and releasing glutamate. Previous studies of the role of GLT-1 in ischaemia have often used the GLT-1 blocker dihydrokainate at concentrations that affect transporters other than GLT-1 and which affect kainate, N-methyl-d-aspartate (NMDA) and α-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA) receptors. In hippocampal slices from postnatal day 14 mice lacking GLT-1, the current response of area CA1 pyramidal cells to superfused AMPA and NMDA (which are not taken up) was unaffected, whereas the response to 100 µm glutamate was more than doubled relative to that in wild-type littermates, a finding consistent with a decrease in glutamate uptake. In response to a few minutes of simulated ischaemia, pyramidal cells in wild-type mice showed a large and sudden inward glutamate-evoked current [the anoxic depolarization (AD) current], which declined to a less inward plateau. In mice lacking GLT-1, the time to the occurrence of the AD current, its amplitude, the size of the subsequent plateau current and the block of the plateau current by glutamate receptor blockers were all indistinguishable from those in wild-type mice. We conclude that GLT-1 does not contribute significantly to glutamate release or glutamate removal from the extracellular space in early simulated ischaemia. These data are consistent with glutamate release being by reversal of neuronal transporters, and with uptake into glia being compromised by the ischaemia-evoked fall in the level of ATP needed to convert glutamate into glutamine.
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  • 10
    ISSN: 1432-0983
    Keywords: Key words Fungi ; gypsy-like LTR retrotransposon ; Solo-LTR ; Reverse transcriptase ; Repeat-induced point mutation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In the filamentous ascomycete Podospora anserina a 6,935-bp retrotransposon, Yeti, has been identified and characterized. It is flanked by a 5-bp target site duplication and contains long terminal repeats (LTRs) 354 bp in length. The LTRs show a high degree of identity to the previously reported repetitive element repa, a sequence suggested to represent a solo-LTR element of an unknown transposon. In the investigated Podospora strains, the number of complete Yeti copies is significantly lower than the number of repa elements, with up to 25 copies. Yeti appears to be inactive: it is highly degenerate and no transcripts of the element have been detected even in Podospora cultures grown under elevated stress conditions. The amino acid sequences deduced from Yeti display significant homology, particularly in the reverse transcriptase region, to those of other fungal retrotransposons, indicating that it is a member of the gypsy family. As suggested by the unusual dinucleotide content, degeneration of Yeti appears to be the result of a molecular mechanism resembling repeat-induced point mutation in Neurospora crassa.
    Type of Medium: Electronic Resource
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