ISSN:
1432-1041
Keywords:
carvedilol
;
propranolol
;
coronary blood flow
;
beta-blockade
;
vasodilation
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Medicine
Notes:
Summary A total of 17 patients with angiographically proven coronary artery disease and at least one stenosis blocking ≥ 70% of the left anterior descending or circumflex artery were included in a double-blind, randomized study. They received either 5 mg carvedilol or 6 mg propranolol intravenously. Heart rate, aortic pressure, mean coronary sinus pressure and coronary flow (thermodilution) were measured and coronary resistance and the rate-pressure product were calculated before and 25 min after injection. Carvedilol significantly (P 〈 0.05) lowered the heart rate (mean, 76 to 69 beats/min), aortic pressure (mean, 153/80–135/72 mmHg), rate-pressure product (mean, 117–93 mmHg/min), and coronary flow (mean, 114–94 ml/min). Coronary resistance (mean, 0.97–1.07 mmHg × min/ml) and coronary flow related to the rate-pressure product (mean, 1.0–1.02 ml/mm Hg) showed no significant change after carvedilol treatment. Propranolol lowered the heart rate (mean, 76–64/min;P 〈 0.05) and rate-pressure product (mean, 109–96 mm. Hg/min; not significant). Aortic pressure (mean, 145/72–147/74 mmHg), coronary flow (mean 109–101 ml/min), coronary resistance (mean, 1.1–1.2 mmHg × min/ml), and coronary flow related to the rate-pressure product (mean,1.12–1.19 ml/mmHg) showed no significant change after propranolol administration. Following single application, carvedilol lowered the rate-pressure product more markedly than did propranolol on account of its acute blood-pressure-lowering effect. No differences in the hemodynamic effects of carvedilol and propranolol were found. Neither drug seems to influence the adaption of coronary flow to myocardial oxygen demand.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01409480
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