Effects of Catecholamines, Exercise, and Nitroglycerin on the Normal and Ischemic Myocardium in Conscious Dogs

Healthy conscious dogs with normal coronary perfusion and the same animals after moderate global ischemia induced by partial occlusion of the left main coronary artery

Isoproterenol, norepinephrine, dobutamine, exercise, and nitroglycerin

Baseline (normal nonischemic state in the same animals)

Left ventricular performance (left ventricular diameter, pressure, velocity of shortening, dP/dt, dP/dt/P, arterial pressure, left circumflex coronary blood flow, and coronary vascular resistance)surrogate