Hemodynamic comparison of dopexamine hydrochloride and dopamine in ischemic left ventricular dysfunction.

The hemodynamic dose-response effects of intravenous dopexamine hydrochloride (0.5 to 2.0 micrograms/kg/min) have been compared with dopamine (2.5 to 10 micrograms/kg/min) in 12 patients with ischemic left ventricular dysfunction in an open randomized crossover study. Both drugs increased cardiac output and decreased systemic vascular resistance. Dopexamine hydrochloride appeared to increase heart rate more than dopamine although this did not reach statistical significance. Dopexamine hydrochloride produced small increases in systolic and decreases in diastolic blood pressure, whereas dopamine had a biphasic effect resulting in a decrease in mean blood pressure at low doses and an increase at the highest dose studied. With increasing dosage, there was a trend toward more vasodilator activity with dopexamine hydrochloride than with dopamine. Dopexamine hydrochloride produced fewer adverse effects than dopamine.