当前位置： SCI文献检索 > CIRCULATION期刊下所有文献 > Splanchnic venous pressure-volume relation during experimental acute ischemic heart failure. Differential effects of hydralazine, enalaprilat, and nitroglycerin.

Splanchnic venous pressure-volume relation during experimental acute ischemic heart failure. Differential effects of hydralazine, enalaprilat, and nitroglycerin.

Abstract：

BACKGROUND:Vasodilator drugs have variable effects on veins and arteries. However, direct measurements of their effects on the splanchnic veins, perhaps the most important volume reservoir, have not been reported. We assessed the effect of acute heart failure and the subsequent administration of hydralazine, enalaprilat, and nitroglycerin on the splanchnic venous pressure-volume relation in intact dogs. METHODS AND RESULTS:Experimental acute ischemic heart failure was induced in 19 splenectomized dogs by microsphere embolization of the left main coronary artery. Embolization was repeated until left ventricular end-diastolic pressure (LVEDP) reached 20 mm Hg and cardiac output decreased by 50%. The splanchnic vascular pressure-volume relation was determined by radionuclide plethysmography during the control stage, after acute heart failure had been established, and after administration of a vasodilator (hydralazine, enalaprilat, or nitroglycerin) at a dose sufficient to reduce mean aortic pressure by approximately 20%. Induction of acute heart failure was associated with a decrease in the splanchnic vascular volume from 100% to 86 +/- 2% and an increase in LVEDP from 6 +/- 1 to 21 +/- 1 mm Hg (P < .001). There was a parallel leftward shift of the splanchnic vascular pressure-volume curve. After the administration of hydralazine, enalaprilat, and nitroglycerin, the splanchnic vascular volumes increased from 86% to 88 +/- 3%, 96 +/- 3%, and 113 +/- 3%, respectively (P = NS, P < .01, and P < .001, respectively, versus heart failure). After drug administration, the LVEDPs were 18 +/- 2, 16 +/- 1, and 13 +/- 1 mm Hg (P = NS, P < .05, and P < .001, respectively, versus heart failure). CONCLUSIONS:Acute heart failure was associated with a parallel leftward shift of the splanchnic venous pressure-volume relation (venoconstriction). Splanchnic (systemic) venoconstriction may in part explain the increased LVEDP during acute heart failure by displacement of blood to the central compartment. Subsequently administered enalaprilat and, to a greater degree, nitroglycerin produced splanchnic venodilation, thereby lowering LVEDP. Hydralazine had no significant effect on the splanchnic veins and only a modest effect on LVEDP. In this model, splanchnic capacitance changes appear to modulate change in left ventricular preload.

journal_name

Circulation

journal_title

Circulation

authors

Wang SY,Manyari DE,Scott-Douglas N,Smiseth OA,Smith ER,Tyberg JV

doi

10.1161/01.cir.91.4.1205

subject

Has Abstract

pub_date

1995-02-15 00:00:00

pages

1205-12

issue

eissn

0009-7322

issn

1524-4539

journal_volume

pub_type

杂志文章

在线工具

Splanchnic venous pressure-volume relation during experimental acute ischemic heart failure. Differential effects of hydralazine, enalaprilat, and nitroglycerin.