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This maneuver is very useful for studying deep-vein flow and detecting valvular incompetence, mainly at the popliteal-vein level (at the back of the knee), and to check perforator-vein incompetence. It is very useful when legs are painful or very edematous (swollen with fluid). [20]
Some veins are named after the physician who first described them: Dodd's perforator at the inferior 1/3 of the thigh; Boyd's perforator at the knee level; Cockett's perforators at the inferior 2/3 of the leg (usually there are three: superior medium and inferior Cockett perforators) Others have the name of the deep vein where they drain:
Since functional venous valves are necessary to facilitate efficient blood return from the lower extremities, CVI primarily affects the legs. When impaired vein function leads to significant symptoms such as oedema (swelling) or venous ulcer formation, the condition is referred to as chronic venous disease . [ 3 ]
an ultrasound diagnosis shows that you have venous reflux (when the valves in your leg veins don’t work correctly, causing blood to pool and flow backward)
Figure A shows a normal vein with a working valve and normal blood flow. Figure B shows a varicose vein with a deformed valve, abnormal blood flow, and thin, stretched walls. The middle image shows where varicose veins might appear in a leg. Comparison of healthy and varicose veins. Varicose veins are more common in women than in men and are ...
Blood clots can damage the valves of the veins, leading to chronic venous insufficiency, which makes it harder for the body to pump blood back to the heart, per the Cleveland Clinic. This can lead ...
Valves in the perforating veins close when a calf muscle contracts, to prevent backflow from the deep veins to the superficial. [25] There are more valves in the lower leg, due to increased gravitational pull, with the number decreasing as the veins travel to the hip. There are no valves in the veins of the thorax or abdomen. [4]
below the knee - to assess incompetence between the short saphenous vein and the popliteal vein. [3] Superficial veins of the leg normally empty into deep veins, however retrograde filling occurs when valves are incompetent, leading to varicose veins. The test is named for Friedrich Trendelenburg, who described it in 1891. [4]