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Short-term effects of captopril on exercise tolerance in patients with chronic stable angina pectoris and normal left ventricular function.
Cardiology 1995
A double-blind, placebo-controlled, crossover study was carried out to evaluate the short-term effects of captopril on exercise tolerance in 18 normotensive patients with chronic stable angina pectoris and normal left ventricular function. Captopril 25 mg (or placebo) was given twice, i.e. in the evening (10 p.m.) and the following morning (8 a.m.), prior to a maximal symptom-limited bicycle exercise test (11 a.m.). Captopril reduced the systolic and diastolic blood pressures at rest (p < 0.01) without causing any reflex tachycardia. The time to onset of S-T depression was prolonged (p < 0.05), and the maximal S-T depression was reduced (p < 0.02). No differences were found between captopril and placebo in total exercise duration or time to onset of angina. The effects of captopril on exercise-induced ischemia were demonstrated most clearly in patients who responded with a greater than 10 mm Hg fall in the resting systolic blood pressure. In conclusion, this study suggests that captopril has anti-ischemic properties, which may be of importance in the treatment of patients with chronic stable angina and normal left ventricular function. These beneficial effects probably relate to a reduction in afterload and myocardial wall stress and therefore a reduction in myocardial oxygen demand.
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