[Hemodynamic relations between capillary and venule].

Following a nosological discussion of the varicose vein, its histological, biochemical and immunological elements are detailed. The hydraulic conditions are described, and attention is drawn to the microvasculartissue consequences of the stasis, the degree of constraint exercised by the interstitial tissue, and the role played by the intricate "micro fiber" network of the microcirculation: only a part of the capillaries reconnect with the veinlet of the same circulatory unit, the others having to flow toward the veinlet of other units and only one initial lymphatic vein contributing to the evacuation of 3 to 4 veinlets. The slightest hydraulic imbalance due to the stasis, sets of a whole series of chain reactions that can rapidly become harmful, with chronic veinous deficiency setting in.