In anesthetized dogs, MDL 17043 (I) [77671-31-9] (0.1, 0.3, or 1 mg/kg, i.v.) produced dose-related increases in cardiac contractility, heart rate, and coronary artery blood flow, and dose-related decreases in mean arterial pressure.These changes were not accompanied by significant changes in myocardial O consumption, although slight transient increases in O consumption coincided with the peak increase in cardiac contractility and heart rate produced by I.