The effect of the cardiotonic imazodan (CI-914) on myocardial and peripheral hemodynamics in the anesthetized dog.

The purpose of this study was to evaluate the effect of the new cardiotonic, imazodan (CI-914), on myocardial hemodynamics and oxygen consumption, and peripheral blood flow distribution. Organ blood flow was measured by the radiolabeled-microsphere-reference-withdrawal technique and myocardial oxygen consumption calculated from arterial and coronary sinus O2 content and blood flow. At inotropic levels, CI-914 decreases mean arterial pressure with a minimal increase in heart rate. CI-914 decreases coronary vascular resistance and increases supply to demand ratio, indicating an active coronary vasodilation. CI-914 does not alter peripheral blood flow distribution, thus suggesting equivalent organ vasodilation. These data suggest that CI-914 may be useful in the treatment of congestive heart failure because of its positive inotropic, coronary vasodilator, and peripheral vasodilator properties.