Document Detail


Regression of cardiac hypertrophy after closing an aortocaval fistula in rats.
MedLine Citation:
PMID:  7611486     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
To determine whether the series addition of sarcomeres observed during eccentric hypertrophic growth is reversible upon removal of the initiating stimulus, an aortocaval fistula was created and myocyte geometry evaluated at 2 and 12 wk after shunt occlusion. A 76% cardiac enlargement was produced in rats with an aortocaval fistula. This enlargement was reduced to 22 and 18% at 2 and 12 wk of fistula reversal, respectively. Hemodynamic performance was altered as a result of fistula induction as evidenced by a 28% increase in peak rate of pressure rise. This pressure increase remained elevated by 30% 2 wk after fistula reversal but was not different from sham-operated control animals at 12 wk of reversal. Significant increases in overall myocyte length were detected as a result of the creation of the fistula [left ventricle (LV), 20%; right ventricle (RV), 29%; septum, 23% greater than shams]. Although these increases diminished only slightly 2 wk after closure of the fistula (LV, 12%; RV, 17%; septum, 12% greater than shams), linear measurements of myocyte length in two of three regions had reverted to values that were not significantly different from those of age-matched, sham-operated controls at 12 wk after fistula closure (LV, 8%; RV, 10%; septum, 7%). Myocyte cross-sectional area and cell volume followed a similar pattern. Thus myocytes possess the necessary machinery to remove recently added series sarcomeres, returning altered pump function and dilated ventricular chamber geometry toward control values. In addition, it appears that cardiac hypertrophic growth with this experimental model of volume overload is largely, but not completely, reversible.
Authors:
A M Gerdes; L C Clark; J M Capasso
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The American journal of physiology     Volume:  268     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1995 Jun 
Date Detail:
Created Date:  1995-08-14     Completed Date:  1995-08-14     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  H2345-51     Citation Subset:  IM    
Affiliation:
Department of Anatomy and Structural Biology, University of South Dakota School of Medicine, Vermillion 57069, USA.
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MeSH Terms
Descriptor/Qualifier:
Animals
Aorta, Abdominal / surgery*
Arteriovenous Shunt, Surgical*
Body Weight
Cardiomegaly / physiopathology*,  surgery
Female
Fistula / surgery*
Heart / anatomy & histology,  physiopathology
Heart Rate
Hemodynamics*
Organ Size
Pulse
Rats
Rats, Sprague-Dawley
Vena Cava, Inferior / surgery*
Grant Support
ID/Acronym/Agency:
HL-30696/HL/NHLBI NIH HHS

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


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