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Application of venous occlusion principle for the estimation of peripheral blood flow. Tourniquet T applied at thigh when inflated to > 50 mm of Hg stops the venous return from distal segment of the leg. This results in an increase in the amount of blood in the body segment between the electrodes V1 and V2 with every cardiac ejection and therefore a corresponding decrease in the impedance of the body segment. Linear segment of ?Z(t) curve showing a ?Za change in impedance during Ta seconds can be used for the computation of blood flow using equation (5). The maximum change in impedance following inflation of tourniquet gives venous capacitance and rate of increase of impedance immediately after deflation of the tourniquet gives maximum venous outflow. 
