Document Detail


Ventricular interaction and venous capacitance modulate left ventricular preload.
MedLine Citation:
PMID:  9191499     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The concept of left ventricular (LV) 'preload' has seemed simple and straightforward. Similarly, the capacitance function of the veins seemed to be defined, in spite of the fact that 'venous return' might be said to be increased in heart failure when it was obvious that cardiac output was substantially decreased. In studies during the past several years, we have demonstrated that pericardial pressure, as a major modulator of ventricular interaction, must be accounted for before preload, myocardial compliance or contractility can be assessed reliably. Also, using a new conceptual model based on venous pressure-volume relations that explains how changes in venous capacitance modulate ventricular preload, we have defined the comparative capacitance-conductance effects of various vasodilators in a model of heart failure. We conclude that left ventricular preload is significantly modulated by both changes in ventricular interaction and venous capacitance. To optimize the care of patients with heart disease, it is important to understand both these mechanisms.
Authors:
J V Tyberg; I Belenkie; D E Manyari; E R Smith
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Review    
Journal Detail:
Title:  The Canadian journal of cardiology     Volume:  12     ISSN:  0828-282X     ISO Abbreviation:  Can J Cardiol     Publication Date:  1996 Oct 
Date Detail:
Created Date:  1997-07-07     Completed Date:  1997-07-07     Revised Date:  2008-04-09    
Medline Journal Info:
Nlm Unique ID:  8510280     Medline TA:  Can J Cardiol     Country:  CANADA    
Other Details:
Languages:  eng     Pagination:  1058-64     Citation Subset:  IM    
Affiliation:
Department of Medicine, University of Calgary, Alberta. jtyberg@cvr.ucalgary.ca
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MeSH Terms
Descriptor/Qualifier:
Heart Failure / physiopathology
Humans
Models, Cardiovascular
Myocardial Contraction / physiology
Vascular Capacitance / physiology*
Ventricular Function, Left / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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