title: Endothelial vascular function in hypertensive patients after renin-angiotensin system blockade.
abstract: It is unclear whether single and combined pharmacologic inhibition of the renin-angiotensin-aldosterone system have similar effects on endothelial function and blood pressure (BP). The authors evaluated 63 hypertensive patients divided into 4 groups (hydrochlorothiazide 25 mg/d; irbesartan [IRBE] 150 mg/d; quinapril [QUIN] 20 mg/d; or IRBE 150 mg/d + QUIN 20 mg/d) and 25 healthy normotensive subjects (normal) followed for 12 weeks. Endothelium-dependent dysfunction measured as flow-mediated dilation at Weeks 0 and 12 were: normal, 11.5%+/-2.4% vs 13.5%+/-2.0%; hydrochlorothiazide, 7.3%+/-2.0% vs 12.8%+/-3.1%; QUIN, 7.2%+/-2.8% vs 13.2%+/-2.1%; IRBE, 7.1%+/-2.8% vs 13.0%+/-2.9%; and IRBE + QUIN, 7.5%+/-1.9% vs 12.8%+/-3.0%. Nitroglycerin-mediated responses were: normal, 26.0%+/-1.9% vs 24.0%+/-2.5%; hydrochlorothiazide, 17.0%+/-2.2% vs 18.3%+/-2.6%; QUIN, 17.8%+/-3.2% vs 23.4%+/-3.0%; IRBE, 16.8%+/-3.6% vs 24.7%+/-2.0%; and IRBE + QUIN, 17.3%+/-3.0% vs 25.1%+/-2.5%. Antihypertensive therapy restored BP to normal and improved the endothelium-dependent and -independent dysfunction after renin-angiotensin-aldosterone system blockade. In a further finding, the combined effect of angiotensin-converting enzyme inhibition and angiotensin II type 1 receptor blockade was not superior to the action of either of these treatments separately.
authors.affiliation: Laboratory of Cardiovascular Pharmacology and Hypertension, Department of Pharmacology, Faculty of Medical Sciences, State University of Campinas (UNICAMP), Campinas, SP, Brazil.
authors.forename: Leoní Adriana
authors.initials: LA
authors.lastname: Souza-Barbosa
authors.forename: Sílvia E
authors.initials: SE
authors.lastname: Ferreira-Melo
authors.forename: Samira
authors.initials: S
authors.lastname: Ubaid-Girioli
authors.forename: Eduardo
authors.initials: E
authors.lastname: Arantes Nogueira
authors.forename: Juan Carlos
authors.initials: JC
authors.lastname: Yugar-Toledo
authors.forename: Heitor
authors.initials: H
authors.lastname: Moreno
mesh_terms: D000806:Angiotensin-Converting Enzyme Inhibitors / Q000627:therapeutic use*; D001794:Blood Pressure / Q000187:drug effects; D004730:Endothelium, Vascular / Q000503:physiopathology*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D006973:Hypertension / Q000097:blood / Q000188:drug therapy / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D005996:Nitroglycerin; D012084:Renin-Angiotensin System / Q000187:drug effects*; D016896:Treatment Outcome; D014664:Vasodilation / Q000187:drug effects / Q000502:physiology*; D014665:Vasodilator Agents
chemical_list: D000806:Angiotensin-Converting Enzyme Inhibitors; D014665:Vasodilator Agents; D005996:Nitroglycerin