title: Endothelial function impairment in chronic venous insufficiency: effect of some cardiovascular protectant agents.
abstract: In segments of human varicose veins, endothelial function was assessed by measuring relaxation induced by acetylcholine in noradrenaline-precontracted preparations. In addition, concentration-response curves to acetylcholine were obtained before and after incubation with the arterial endothelium protectant agents captopril, losartan, troglitazone, pravastatin, or simvastatin. The antivaricose agent escin was also tested. Mean acetylcholine-induced relaxation of varicose venous rings was about 13%, approximately one third of that reported for control saphenous veins. Concentration-response curves to acetylcholine were ''u'' shaped, the result of endothelium-mediated relaxation at low concentrations, superseded by subsequent smooth muscle contractile responses. Relaxation was enhanced by the endothelium-protecting agents and by escin, troglitazone being the least, and simvastatin the most effective. It was concluded that endothelial dysfunction is present in varicose veins, that this anomaly can be reverted by cardiovascular protecting agents, and that it can play a role in the pathogenesis and treatment of chronic venous insufficiency.
authors.affiliation: Department of Pharmacology, School of Medicine, Universidad Nacional Autónoma de México, Mexico City, Mexico. ofco@salud.gob.mx
authors.forename: Omar F
authors.initials: OF
authors.lastname: Carrasco
authors.forename: Alejandra
authors.initials: A
authors.lastname: Ranero
authors.forename: Enrique
authors.initials: E
authors.lastname: Hong
authors.forename: Horacio
authors.initials: H
authors.lastname: Vidrio
mesh_terms: D000328:Adult; D000368:Aged; D002317:Cardiovascular Agents / Q000627:therapeutic use*; D002908:Chronic Disease; D004730:Endothelium, Vascular / Q000187:drug effects / Q000503:physiopathology*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D012189:Retrospective Studies; D012501:Saphenous Vein / Q000000981:diagnostic imaging / Q000187:drug effects / Q000503:physiopathology*; D018616:Ultrasonography, Doppler, Duplex; D014664:Vasodilation / Q000187:drug effects / Q000502:physiology*; D014689:Venous Insufficiency / Q000000981:diagnostic imaging / Q000503:physiopathology* / Q000517:prevention & control
chemical_list: D002317:Cardiovascular Agents