Mechanisms of nitrate action in patients with severe left ventricular failure: Conceptual problems with the theory of venosequestration

Milton Packer

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Nitroglycerin and other organic nitrates exert a number of favorable effects on the circulation of patients with severe congestive heart failure, and these effects mediate the short- and long-term hemodynamic and clinical improvement that follows treatment with these drugs. Although these agents are potent dilators of systemic venous capacitance vessels, present evidence indicates that they do not exert their beneficial hemodynamic and clinical effects by decreasing venous return to the heart. Rather, their ability to dilate pulmonary and systemic resistance vessels offsets any decrease in cardiac output that might be expected to occur from a decrease in venous return. Of equal importance, the increase in output of the left side of the heart that results from drug-induced pulmonary and systemic vasodilation prevents any decrease in venous return to the right side of the heart that might be expected to accompany an increase in systemic venous capacitance. The net effect of these two interacting forces is not only to keep cardiac output and venous return constant but also to translocate blood volume from the pulmonary circulation and left ventricle to the systemic vessels. In addition, nitrates also relieve subendocardial ischemia and favorably alter pressure-volume relationships in the left ventricle. These observations support the conclusion that the complex cardiovascular responses to organic nitrates in patients with congestive heart failure cannot be adequately summarized by the single concept of preload reduction.

Original languageEnglish (US)
Pages (from-to)259-264
Number of pages6
JournalAmerican Heart Journal
Volume110
Issue number1 PART 2
DOIs
StatePublished - 1985

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Nitrates
Cardiac Output
Heart Ventricles
Heart Failure
Hemodynamics
Lung
Pulmonary Circulation
Nitroglycerin
Blood Volume
Vasodilation
Pharmaceutical Preparations
Ischemia
Pressure
Therapeutics

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

Cite this

Mechanisms of nitrate action in patients with severe left ventricular failure : Conceptual problems with the theory of venosequestration. / Packer, Milton.

In: American Heart Journal, Vol. 110, No. 1 PART 2, 1985, p. 259-264.

Research output: Contribution to journalArticle

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