Central and regional hemodynamic effects of oral enoximone in congestive heart failure: A double-blind, placebo-controlled study

Carl V. Leier, John J. Lima, Steffen E.L. Meiler, Donald V. Unverfeth

Research output: Contribution to journalArticle

20 Scopus citations


Twelve patients with congestive heart failure underwent a double-blind, placebo-controlled study for the purpose of examining the central and regional hemodynamic effects of first-dose (1 and 2 mg/kg) oral enoximone, a new phosphodiesterase III inhibitor. Enoximone augmented cardiac output, generally through a positive chronotropic response. Indices of left ventricular contractility, specifically stroke volume, ΔP Δt, fractional shortening rate, and the duration of the preejection period, were only modestly enhanced by enoximone. At 2 mg/kg, systemic vascular resistance fell below baseline values without affecting systemic blood pressure; these parameters were not altered by the 1 mg/kg dose. Both pulmonary artery pressure and pulmonary vascular resistance dropped below baseline and below placebo control for the 2 mg/kg dose. Enoximone at 2 mg/kg lowered right and left heart filling pressures below baseline. Examination of regional hemodynamic responses to both doses demonstrated a reduction in limb vascular resistance and an increase in limb blood flow proportional to the concomitant increase in cardiac output. Renal and hepatic-splanchnic blood flow and vascular resistances were not altered by enoximone. First-dose oral enoximone (1 and 2 mg/kg) alters hemodynamics in heart failure by predominant vasodilatation, particularly of limb-musculoskeletal and pulmonary vascular beds, some positive chronotropism, and modest positive inotropism.

Original languageEnglish (US)
Pages (from-to)1051-1059
Number of pages9
JournalAmerican Heart Journal
Issue number5
StatePublished - May 1988
Externally publishedYes


ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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