Deleterious cardiac effects of captopril during acute myocardial ischaemia in the dog

Abstract

Objective: The aim was to evaluate the effects of the angiotensin converting enzyme inhibitor captopril on acute myocardial ischaemia. Methods: Seventeen anaesthetised open chest dogs were randomised to 3 minute angioplasty balloon occlusions of the left circumflex coronary artery before and after intravenous infusion of captopril (n=8) or placebo (n=9). Results: There was apparent worsening of ischaemia during balloon inflation after captopril infusion, when compared with control inflation, as suggested by further ST segment elevation of 1.8 (SD 1.8) mm, p−1, p−1, p−1·g⁻¹, pConclusions: Despite lower myocardial metabolic demands, acute intravenous administration of captopril was associated with increased ischaemia during transient coronary artery occlusion.