Document Detail


Myocardial morphometric changes related to decreased contractility after endotoxin.
MedLine Citation:
PMID:  8967388     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Decreased ventricular contractility during sepsis lasts much longer than the half-lives of inflammatory mediators that have been suggested to be myocardial depressant factors. Our hypothesis is that blood-borne factors may also cause myocardial structural changes, including damage and death of myocytes, associated with decreased ventricular contractility. We tested this hypothesis in an isolated rabbit heart perfused by a support rabbit. Support rabbits received 1 mg/kg endotoxin i.v. over 30 min (endotoxin group, n = 7) or vehicle (control group, n = 6). The slope of the end-systolic pressure-volume relationship, Emax, was used to measure contractility of the isolated heart. Five hours after endotoxin infusion, Emax decreased by 17 +/- 7% (P < 0.03) compared with 0 +/- 2% in the control group. Quantitative morphometric analysis of isolated hearts from the endotoxin group demonstrated an increased volume fraction of myocardial capillaries occupied by leukocytes (15.7 +/- 3.5 vs. 3.0 +/- 0.7% in the control group, P < 0.05), structurally abnormal myocytes (7.6 +/- 3.6 vs. 0.8 +/- 0.4%, P < 0.05), and interstitial edema (23.2 +/- 5.2 vs. 14.3 +/- 2.1%, P < 0.05). We conclude that blood-borne factors cause myocardial structural changes that may contribute to decreased ventricular contractility and may explain the prolonged decrease in ventricular contractility during sepsis.
Authors:
C M Goddard; M F Allard; J C Hogg; K R Walley
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Publication Detail:
Type:  In Vitro; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The American journal of physiology     Volume:  270     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1996 Apr 
Date Detail:
Created Date:  1996-12-04     Completed Date:  1996-12-04     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  H1446-52     Citation Subset:  IM    
Affiliation:
Pulmonary Research Laboratory, St. Paul's Hospital, University of British Columbia, Vancouver, Canada.
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MeSH Terms
Descriptor/Qualifier:
Animals
Blood Volume / drug effects
Coronary Circulation
Endotoxins / pharmacology*
Female
Heart / drug effects
Heart Rate / drug effects
Leukocyte Count / drug effects
Leukocytes / physiology
Male
Myocardial Contraction / drug effects*
Myocardium / pathology*
Rabbits
Chemical
Reg. No./Substance:
0/Endotoxins

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


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