title: Blood-flow in incompetent perforating veins.
abstract: A new pulsed multichannel ultrasonic Doppler instrument was used to determine the relative blood-flow in the perforating veins of 16 patients with symptoms attributable to their leg venous systems. 9 patients had leg ulceration and 7 did not. 8 (89%) of the ulcer patients had sustained blood-flow from the deep to the superficial veins ("reverse") during calf muscle contraction, compared to 1 (14%) of the group without leg ulcers. This evidence supports the theory that postphlebitic leg ulceration is the result of retrograde flow of blood in incompetent calf perforating veins during walking.
mesh_terms: D001775:Blood Circulation; D007871:Leg Ulcer / Q000209:etiology*; D009119:Muscle Contraction; D014465:Ultrasonics / Q000295:instrumentation; D014463:Ultrasonography; D014689:Venous Insufficiency / Q000150:complications / Q000503:physiopathology*; D014690:Venous Pressure