[2 types of dynamics of filling of veins in the extremities during obstruction of venous outflow].

The method of venous occlusion plethysmography improved by introduction of differential and logarithmic-computing signal amplifiers was used to study the time course of blood inflow to the limbs in 35 healthy individuals and 115 patients with diseases of lower limb veins. Two types of the time course of the vein blood content were defined. With type I the volume velocity (VV) of blood supply to the segment under study decreases, whereas with type II the VV first decreases and then remains unchanged for a long time. Type I occurs in 76% of healthy individuals, type II in 74% of patients. With type II the increment of the vein capacity is significantly reduced in both healthy individuals and in patients with varicose veins. Moreover, in healthy individuals, the VV, the time of constant venous volume attainment, and the rate of blood outflow from veins (after occlusion removal) significantly differ as well in types I and II. Both types of the blood content remain unchanged while both applying the functional tests and during examinations at varying times. It is assumed that type II blood content is determined by greater rigidity of the venous vessels.