Direct myocardial effects of OPC-18790 in human heart failure: Beneficial effects on contractile and diastolic function demonstrated by intracoronary infusion with pressure-volume analysis

Guy A. MacGowan, Howard L. Haber, T. Douglas Cowart, Christine Tedesco, Clarence Wu, Marc D. Feldman

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Objectives. We sought to determine the precise myocardial effects of OPC-18790 as demonstrated by intracoronary administration. Background. Although previous studies have determined the cardiovascular effects of a novel intravenous inotrope, OPC-18790, the observed benefits on contractile and diastolic function may have been confounded by the marked changes in peripheral loading associated with this drug when given intravenously. Methods. Eight heart failure patients received intracoronary OPC-18790 at 31.25 μg/min for 20 min, and then at 62.5 μg/min for another 20 min. Hemodynamic variables and pressure-volume indexes using the conductance catheter method were determined at baseline and then after the two doses. Results. There were no significant effects on heart rate, cardiac output or loading conditions, including afterload as determined by systemic vascular resistance and arterial elastance (E(a)) and preload as determined by end- diastolic volume (EDV). There were significant increases in end-systolic elastance (E(es)) from 0.74 ± 0.11 to 0.90 ± 0.16 mm Hg/ml at 31.25 μg/min and to 1.37 ± 033 mm Hg/ml at 62.5 μg/min (p < 0.05 by analysis of variance [ANOVA]). Diastolic function improved, as determined by the time constant for isovolumetric relaxation tau, which decreased significantly from baseline to 31.25 μg/min (94 ± 9 to 79 ± 9 ms, p < 0.05), and did not shorten further at 62.5 μg/min (78 ± 8 ms, p = NS). There were significant decreases in fight atrial pressure (9 ± 1 to 7 ± 1 mm Hg, p < 0.01 by ANOVA) and mean pulmonary artery wedge pressure (21 ± 3 to 16 ± 2 mm Hg, p < 0.05 by ANOVA). This fall in filling pressures was not accompanied by any change in EDV. Inspection of the diastolic portion of the pressure-volume curve confirmed a downward shift consistent with pericardial release in five of the eight patients. Conclusions. Intracoronary administration of OPC-18790 demonstrates that the direct myocardial effects of this agent include a modest increase in inotropy and improvement in diastolic function, both of which occur without increases in heart rate, indicating that this agent may be beneficial for the intravenous treatment of congestive heart failure.

Original languageEnglish (US)
Pages (from-to)1344-1351
Number of pages8
JournalJournal of the American College of Cardiology
Volume31
Issue number6
DOIs
StatePublished - May 1998
Externally publishedYes

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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