Effects of CP-060S, a novel cardioprotective drug, on cardiac function and myocardial oxygen consumption.

1. We examined the effects of CP-060S on cardiac function and myocardial oxygen consumption (MVO2) in anesthetized dogs. 2. CP-060S (10-300 microg/kg i.v.) decreased heart rate, increased aortic flow and decreased mean blood pressure in a dose-dependent manner. The PR interval was significantly prolonged by administration of CP-060S (300 microg/kg i.v.). 3. CP-060S (10-300 microg/kg i.v.) increased coronary blood flow in a dose-dependent manner. Left ventricular end-diastolic pressure and maximal first derivative of left ventricular pressure were not significantly affected. 4. CP-060S (10-300 microg/kg i.v.) increased coronary sinus blood flow and decreased arteriovenous oxygen difference and MVO2 in a dose-dependent manner. 5. The effects of CP-060S on cardiac function and MVO2 are qualitatively similar to those of diltiazem, a typical Ca2+ antagonist.