[Venous physiopathology. The major pathogenic processes in venous pathology and their consequences].

Various pathological circumstances, and especially: acute venous thrombosis, superficial venous insufficiency and post-phlebitic disease, may upset the conditions of venous circumlation. Among the major pathological processes that may thus be involved, one can underline: -- Venous obstruction, whose physiopathology is different in the acute thrombosis and in the post-phlebitic phase. Especially studied in this work are: the phases of the enry into the acute venous stasis, which may lead to venous gangrene -- the offset and non offset obstructive syndromes. The offsetting of a venous obstruction depending on the development of a sufficient and effective substitute circulation. -- The orthostatic reflux may involve the superficial venous network (superficial venous insufficiency) or the deep one (deep venous insufficiency). In either case, the insufficiency of the communicating veins may complicate the primary venous insufficiency. -- On the tissue level, various pathogenic processes induce a peripheral venous stasis, generating problems that may be classed under three headings: lymphatic repercussions, arterial problems and dysfunctions of the arterio-venous anastomoses. These various processes and their consequences on the tissue level, are studied.