Fig. 6.

Pressure recordings from the great saphenous vein above the ankle in a patient with chronic venous insufficiency and varicose ulcer. Factual pressure followed by damped pressure. Top: the gravest form of ambulatory venous hypertension; no decrease in pressure during calf pump activity. Bottom: restoration of physiological pressure conditions after temporary occlusion of the refluxing great saphenous vein. Arrow marks the end of muscle contractions. Ambulatory venous hypertension was caused by venous reflux, not by calf pump failure.