Document Detail


Relaxation-systolic pressure relation. A load-independent assessment of left ventricular contractility.
MedLine Citation:
PMID:  9024166     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This contribution reviews the regulation of left ventricular pressure (LVP) fall by load and relates this regulation to left ventricular contractility. Load regulation of LVP fall has to be distinguished from neurohumoral regulation, from effects induced by arterial reflected waves and from long-term load effects on contractility. The response of LVP fall to a moderate elevation of systolic LVP is highly variable. It depends on the ratio between the actual systolic pressure and peak isovolumetric pressure, defined as "relative load". Up to a relative load of 81% to 84%, LVP fall accelerates. Above this relative load, LVP fall decelerates. Depending on the level of relative load there is a wide variety of effects ranging from moderate acceleration of LVP fall to marked deceleration of LVP fall. Acceleration of LVP fall in response to a load elevation is associated with normal cardiac function, while slowing of LVP fall is associated with impaired cardiac function. Similar but opposite effects are observed with reductions of systolic LVP. Effects of changes in systolic LVP on time constant tau reveal a fair correlation with systolic elastance (Ees), peak dP/dtmax and regional fractional shortening (or ejection fraction). There is an excellent correlation with measured isovolumetric LVP, indicating that contraction-relaxation coupling is close when contractility is expressed in terms of peak isovolumetric pressure. Assessment of contractility with systolic LVP-relaxation relation is precise and load independent and can be performed with the sole use of a high-fidelity pressure gauge positioned in the left ventricular cavity.
Authors:
T C Gillebert; A F Leite-Moreira; S G De Hert
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Publication Detail:
Type:  Journal Article; Review    
Journal Detail:
Title:  Circulation     Volume:  95     ISSN:  0009-7322     ISO Abbreviation:  Circulation     Publication Date:  1997 Feb 
Date Detail:
Created Date:  1997-03-11     Completed Date:  1997-03-11     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0147763     Medline TA:  Circulation     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  745-52     Citation Subset:  AIM; IM    
Affiliation:
Cardiovascular Research Unit (Department of Experimental Surgery), University of Antwerp, Belgium. gillebe@uia.ua.ac.be
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MeSH Terms
Descriptor/Qualifier:
Animals
Cardiac Output, Low / physiopathology
Hemodynamics
Homeostasis
Humans
Models, Cardiovascular
Myocardial Contraction*
Pressure
Systole
Ventricular Function, Left*

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


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