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  • 1
    ISSN: 1432-0649
    Keywords: 87.55.Hb ; 82.50.Fv ; 87.15.Mi ; 87.50.Eg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Photoablation studies of biological material (human cornea) with UV and visible laser light show that effective, apparently non-conventional thermal photoablation can be achieved by introducing energy absorbing dopants in the tissue. Previously unknown high ablation rates of 80 Gmm/pulse have been observed. The results allow one to clearly postulate different ablation mechanisms for increasing laser fluence. The results are compared with the photoablation rates observed with 193 nm UV laser light on undoped human cornea. Explosive desorption has been found the dominant process involved.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Langenbeck's archives of surgery 335 (1974), S. 339-349 
    ISSN: 1435-2451
    Keywords: Portacaval Shunt ; Arterialization of the Liver
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die pathophysiologischen Veränderungen des portocavalen Shunt und der Einfluß der Arterialisation der Leber auf diese Mechanismen wurden an Hunden untersucht. Ein portocavaler End-zu-Seit-Shunt wurde bei allen Tieren durchgeführt. In einer Gruppe wurde durch Interposition der V. jugularis externa zwischen dem Stumpf der Pfortader und der Aorta abdominalis eine druck- und durchflußkontrollierte Arterialisation der Leber angeschlossen. Die Tiere wurden 10 Wochen beobachtet. Der portocavale Shunt führte zu einer Reduktion des Leberblutflusses von 38,5 ± 13,3 auf 10,5 ± 1,7 ml/kg/min (P 〈 0,001) zur Atrophie der Leber, zur Einschränkung der Indocyaningrün-Clearance von 101 ± 022 auf 053 ± 014 (P 〈 0,001) und zum Anstieg der Konzentration von Ammoniak von 48 ± 13 auf 155 +- 36 (P 〈 0,001) und Gallensäuren von 3 ± 2 auf 239 ± 93 (P 〈 0,001) im peripheren Blut. Durch Arterialisation konnten diese pathologischen Veränderungen weitgehend vermieden werden. Die beiden wichtigsten Komplikationen der Arterialisation waren Thrombose des Interponates und Anstieg des intrahepatalen Druckes. Diese Ergebnisse zeigen, daß durch den portocavalen Shunt pathophysiologische Veränderungen entstehen, welche die bekannten Komplikationen Leberinsuffizienz und Encephalopathie beim Cirrhosepatienten verursachen können. Der günstige Effekt der Arterialisation auf diese Veränderungen stimuliert die Anwendung dieser Methode zur Behandlung der portalen Hypertension von Patienten mit Lebercirrhose.
    Notes: Summary The effects of portacaval shunt with and without arterialization of the hepatic portal vein were studied in dogs. An end-to-side portacaval shunt was performed in all animals, and in one group this was followed by the interposition of an external jugular vein graft between the hepatic stump of the portal vein and the abdominal aorta. The dogs were observed over a period of 10 weeks. Portocaval shunt alone caused a decrease in liver blood flow from 38.5 ± 13.3 to 10.5 ± 1.7 ml/kg/min (P 〈 0.001), hepatic atrophy, impaired indocyanin green clearance from 101 ± 022 to 053 ± 014 (P 〈 0.001) and increased concentrations of ammonia from 48 ± 13 to 155 ± 36 (P 〈 0.001) and bile acids from 3 ± 2 to 239 ± 93 (P 〈 0.001) in the peripheral blood. These effects were prevented by arterilization of the liver. Thrombosis of the arterial graft and increase in intrahepatic blood pressure were the two major complications of arterialization which were observed. These findings indicate that depriving the liver of portal blood causes pathophysiological changes which may be responsible for the well known complications of liver failure and encephalopathy observed following portocaval anastomosis in cirrhotic patients. The fact that arterialization of the portal vein minimizes these changes encourages the application of this procedure in the treatment of portal hypertension in man.
    Type of Medium: Electronic Resource
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