Abstract:
BACKGROUND:We studied in coronary conductance and resistance arteries the coronary vasodilator effects of the angiotensin-converting enzyme inhibitor ramiprilat and the contribution of nitric oxide, bradykinin, and prostaglandins to this vasodilation. METHODS AND RESEARCH:In seven anesthetized dogs, a Doppler guidewire was placed in the circumflex coronary artery to measure coronary flow velocity, and an ultrasound imaging catheter was introduced over the Doppler wire to measure coronary cross-sectional area. Drugs were infused directly into the left main coronary artery to minimize systemic effects. Ramiprilat increased both epicardial cross-sectional area and coronary blood flow velocity, resulting in an increase in absolute coronary blood flow. Pretreatment with N omega-nitro-L-arginine methyl ester (100 micromol/L intracoronary) to block nitric oxide synthase attenuated ramiprilat-induced increase in epicardial coronary cross-sectional area (P<.05) but not in coronary flow velocity or coronary blood flow. In contrast, pretreatment with the selective bradykinin antagonist HOE 140 (10 micromol/L) attenuated ramiprilat-induced increase in flow velocity (P<.025) and coronary blood flow (P<.05) but not epicardial coronary cross-sectional area. Pretreatment with indomethacin (5 mg/kg body wt IV) did not alter ramiprilat-induced increase in epicardial cross-sectional area, nor did it significantly influence coronary blood flow. CONCLUSIONS:Other than decreasing angiotensin II production, acute ramiprilat-induced vasodilation in canine coronary conductance arteries is mediated in part by nitric oxide. Ramiprilat-induced vasodilation in resistance arteries is in part mediated by the action of bradykinin.
journal_name
Circulationjournal_title
Circulationauthors
Sudhir K,Chou TM,Hutchison SJ,Chatterjee Kdoi
10.1161/01.cir.93.9.1734subject
Has Abstractpub_date
1996-05-01 00:00:00pages
1734-9issue
9eissn
0009-7322issn
1524-4539journal_volume
93pub_type
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