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Dobutamine increases cardiac output of the total artificial heart. Implications for vascular contribution of inotropic agents to augmented ventricular function.

Abstract：

BACKGROUND:The synthetic catecholamine dobutamine increases stroke volume in normal subjects and in patients with congestive heart failure. In addition to its direct influence on myocardial contractility, dobutamine may significantly modulate vascular tone because of its alpha- and beta-adrenergic agonist activity. METHODS AND RESULTS:To test the hypothesis that such vasoactive properties significantly contribute to the improved ventricular performance noted with this agent, hemodynamic parameters were measured during stepped ascension infusion of dobutamine in a model that is insensitive to positive inotropic stimulation. Administration of dobutamine in nine calves that underwent replacement of the native right and left ventricles with pneumatically driven total artificial hearts resulted in a significant (p = 0.0001) increase in cardiac output from 7.0 +/- 1.8 to 8.2 +/- 1.8 l/min and a significant (p = 0.0001) decrease in total peripheral vascular resistance from 1,224 +/- 559 to 745 +/- 317 dyne.sec/cm5. A less marked influence was noted on the pulmonary vasculature, with pulmonary vascular resistance exhibiting a significant (p less than 0.05) decrease from its baseline value only at the peak infusion. Consistent with an increase in venous return, both left and right atrial pressures increased significantly (p less than 0.005) with dobutamine administration. CONCLUSIONS:These data demonstrate that the vasoactive properties of dobutamine significantly contribute to improved ventricular performance independent of direct myocardial stimulation. This effect appears to result in part from a direct modulation of myocardial stimulation. This effect appears to result in part from a direct modulation of arterial and venous tones rather than from a reflex response to primary changes in contractility.

journal_name

Circulation

journal_title

Circulation

authors

Binkley PF,Murray KD,Watson KM,Myerowitz PD,Leier CV

doi

10.1161/01.cir.84.3.1210

subject

Has Abstract

pub_date

1991-09-01 00:00:00

pages

1210-5

issue

eissn

0009-7322

issn

1524-4539

journal_volume

pub_type

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Dobutamine increases cardiac output of the total artificial heart. Implications for vascular contribution of inotropic agents to augmented ventricular function.