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Differential effects of milrinone and dobutamine on right ventricular preload afterload and systolic performance in congestive heart failure secondary to ischemic or idiopathic dilated cardiomyopathy



Differential effects of milrinone and dobutamine on right ventricular preload afterload and systolic performance in congestive heart failure secondary to ischemic or idiopathic dilated cardiomyopathy



American Journal of Cardiology 60(16): 1329-1333



To compare the effects of intravenous dobutamine and milrinone on right ventricular (RV) systolic function, 14 patients with severe congestive heart failure underwent simultaneous radionuclide-hemodynamic study. Patients were randomized to receive intravenous milrinone (50 .mu.g/kg bolus then 0.5 .mu.g/kg/min) or dobutamine (2.5 to 15 .mu.g/kg/min) to achieve equal increases in cardiac output. Both drugs significantly improved cardiac performance, with identical 24% increases in mean cardiac index (p < 0.05 vs baseline; difference not significant for milrinone vs dobutamine) and no change in heart rate. Neither drug substantially altered RV preload, as reflected by mean right atrial pressure and RV end-diastolic volume. Both drugs caused similar increases in RV ejection fraction (mean .+-. standard deviation; dobutamine: 0.32 .+-. 0.09 to 0.40 .+-. 0.11; p < 0.05; milrinone: 0.35 .+-. 0.19 to 0.43 .+-. 0.21; p < 0.05) resulting from reductions in RV endsystolic volume. RV afterload reduction contributed substantially to drug effect on RV systolic performance in patients treated with milrinone but not those treated with dobutamine. With doses effecting equal increases in cardiac index and RV systolic performance, pulmonary artery and end-systolic pressure was significantly reduced by milrinone (40 .+-. 12 to 33 .+-. 12 mm Hg; p < 0.05), but not by dobutamine. Thus, in patients with congestive heart failure milrinone's effect on RV systolic function is explainable, at least in part, by RV afterload reduction, whereas RV inotropic augmentation contributed more strongly to dobutamine's effect.

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Accession: 005155245

Download citation: RISBibTeXText

PMID: 3687783

DOI: 10.1016/0002-9149(87)90616-3


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