Effect of antianginal agents on the relationship between rate-pressure product and myocardial oxygen uptake.
To evaluate the effects of antianginal agents on the correlation between rate-pressure product and myocardial oxygen uptake, multistage supine leg exercise tests were performed by 21 patients with stable effort-induced angina pectoris before and after administration of antianginal drugs (a calcium channel blocker of the dihydropyridine class [10 mg of nisoldipine orally] in 11 patients and a beta-blocker [0.2 mg/kg of propranolol intravenously] in 10 patients). The rate-pressure product was closely correlated with myocardial oxygen uptake before and after administration of each drug. However, the slope of the regression line of rate-pressure product (X) and myocardial oxygen uptake (Y) became significantly steeper after the calcium channel blocker administration, and the Y-intercept was significantly increased by administration of the beta-blocker. Myocardial oxygen uptake was increased after administration of the calcium channel blocker and the beta-blocker compared with control values at corresponding rate-pressure product. These observations should be considered when the rate-pressure product is used to predict myocardial oxygen uptake in patients with angina pectoris who are receiving antianginal drugs.
Kodama
Y
Y
First Department of Internal Medicine, Nagoya University School of Medicine, Japan.
Yokota
M
M
Miyahara
T
T
Matsunami
T
T
Sobue
T
T
Saito
H
H
D000328:Adult; D000368:Aged; D000787:Angina Pectoris / Q000175:diagnosis / Q000188:drug therapy* / Q000453:epidemiology / Q000503:physiopathology; D001794:Blood Pressure / Q000187:drug effects*; D017023:Coronary Angiography; D004341:Drug Evaluation; D004562:Electrocardiography; D005080:Exercise Test / Q000706:statistics & numerical data; D005260:Female; D006321:Heart / Q000187:drug effects*; D006339:Heart Rate / Q000187:drug effects*; D006439:Hemodynamics / Q000187:drug effects; D006801:Humans; D008297:Male; D008875:Middle Aged; D009206:Myocardium / Q000378:metabolism*; D015737:Nisoldipine / Q000627:therapeutic use; D010101:Oxygen Consumption / Q000187:drug effects*; D011433:Propranolol / Q000627:therapeutic use; D012044:Regression Analysis
D015737:Nisoldipine; D011433:Propranolol