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Comparative hemodynamic effects of digoxin vs nitroprusside in conscious dogs with aortocaval fistula-induced chronic left ventricular volume overload and normal systolic performance.

Abstract：

:We compared the effects of IV digoxin (0.04 mg/kg) and nitroprusside (NP) (1.2 and 1.8 microgram/kg/min) on left ventricular (LV) performance in six preinstrumented conscious dogs with 3 and 6 hours after digoxin administration (serum level, 3.5 +/- 0.6 ng/ml), there were no changes in heart rate, LV systolic (LVSP) and end-diastolic (LVEDP) pressures, LV dimensions, LV dP/dtmax, or percent minor diameter shortening as compared to control values in the resting state, after beta blockade, or during phenylephrine infusion. By contrast, NP produced a significant reduction (p less than 0.05) in LVEDP (16 +/- 3 to 10 +/- 3 mm Hg) at the smaller dose which caused no change in mean aortic pressure. The larger dose of NP further reduced LVEDP and evoked significant (p less than 0.05) decreases in LVSP (124 +/- 5 to 117 +/- 7 mm Hg), mean aortic pressure (85 +/- 3 to 78 +/- 5 mm Hg), and LV end-diastolic dimension (LVEDD) (53.0 +/- 5.5 to 52.0 +/- 5.7 mm), while augmenting LV dp/dtmax (3288 +/- 266 to 3647 +/- 130 mm Hg/sec). Beta blockade with IV propranolol (2.0 mg/kg) prevented the rise in LV dP/dtmax after high-dose NP administration but did not alter the reductions in mean aortic pressure, LVEDP, and LVEDD. This study indicates that NP, but not digitalis, has a favorable effect on LV hemodynamics in the volume-overloaded heart with normal LV systolic contraction and high-output CHF resulting from increased blood volume and reduced LV diastolic compliance. At least part of the apparent improvement in LV performance observed with high-dose NP is sympathetically mediated since it can be attenuated by beta blockade.

journal_name

Am Heart J

journal_title

American heart journal

authors

O'Rourke RA,Badke FR,Forst D

doi

10.1016/0002-8703(82)90335-0

subject

Has Abstract

pub_date

1982-04-01 00:00:00

pages

489-97

issue

4 Pt 1

eissn

0002-8703

issn

1097-6744

pii

0002-8703(82)90335-0

journal_volume

103

pub_type

杂志文章

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