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Ultrastructural changes of venous autologous bypass grafts in rabbits: Correlation of patency and development

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Summary

Electron microscopic techniques were used to correlate the patency of venous autografts in rabbits with ultrastructural changes within a time range from 5 days to 6 months p.o. Early degenerative changes of the grafts include endothelial desquamation followed by fibrin deposition or platelet adhesion, mural edema and extensive medial and adventitial degeneration. The regeneration of the grafts is due to an early adventitial vascularization (10 days p.o.), which enables the surviving smooth muscle cells and fibrocytes to proliferate and to develop an arterial-like vessel. The organization of the 6-month-old graft is comparable to the carotid artery of the animal, but shows, in contrast, many features of a muscular artery.

Zusammenfassung

Mit Hilfe elektronenmikroskopischer Methoden wurde versucht, die Funktionsfähigkeit autologer Venentransplantate mit ultrastrukturellen Veränderungen in einem Zeitraum von 5 Tagen bis 6 Monaten p. o. zu korrelieren. Frühe degenerative Veränderungen der Transplantate umfassen Endothelabschilferungen mit anschließender Fibrin- bzw. Plättchenauflagerung, murale Ödeme und ausgedehnte mediale und adventitielle Degenerationen. Die Regeneration der Transplantate wird ermöglicht durch eine frühe adventitielle Kapillarisierung (10 Tage p. o.), die die überlebenden glatten Muskelzellen und Fibrozyten in die Lage versetzt, zu proliferieren und ein arterienähnliches Gefäß zu entwickeln. Der Aufbau der 6 Monate alten Vene ist vergleichbar mit der Arteria carotis communis der Tiere, zeigt aber im Gegensatz dazu überwiegend Merkmale einer Arterie vom muskulären Typ.

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  1. M. Bergmann

    Present address: Anatomisches Institut der Universität Münster (Westf.), Vesaliusweg 2-4, D-4400, Münster, Federal Republic of Germany

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  1. Anatomisches Institut der Universität Münster (Westf.), Vesaliusweg 2-4, D-4400, Münster, Federal Republic of Germany

    N. Walther

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Bergmann, M., Walther, N. Ultrastructural changes of venous autologous bypass grafts in rabbits: Correlation of patency and development. Basic Res Cardiol 77, 682–694 (1982). https://doi.org/10.1007/BF01908319

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  • DOI: https://doi.org/10.1007/BF01908319

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