Langendoen, S.I.

venou reflux pressure venous pressure valve venous system venous disease erasmus univ rotterdam disease calf muscle muscle duplex ultrasonography treatment patient result venous hypertension therapy j vasc surg venous valve closure return popliteal vein function microcirculation system blood principle mechanism starling endovascular erasmu complaint rotterdam position phase varicose veins balance sterre irene langendoen ultrasonography skin microcirculation surgery neumann return mechanisms closure capillary gastrocnemius absence duplex insight gastrocnemius veins capacity gravity hypertension prevalence perspective population volume popliteal amount study downloaded pvs.sagepub.com filtration detection output equilibrium relation venous ulcers phlebologist valve cusps supine position author hemodynamic capillary pressure venous valves venous thrombosis right atrium examination phlebology practice article venous return