Document Detail

Longitudinal study of cardiac remodelling in rabbits following infarction.
MedLine Citation:
PMID:  22265993     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Cardiac remodelling following myocardial infarction (MI) is a complex, dynamic process. There have been few longitudinal studies of these changes.
METHODS: A 2-dimensional transthoracic echocardiography was performed on 20 rabbits, before and 1, 2, 4, 8, and 12 weeks after MI (n = 14) and twice for controls (n = 6). Chronic left ventricular (LV) infarct size was histologically characterized and correlated with mechanical function. A linear mixed model was used to analyze longitudinal and infarct size-related changes in LV end-systolic volume (ESV), end-diastolic volume (EDV), ejection fraction (EF), sphericity, circumferential strain, and wall motion score index.
RESULTS: Mean LV infarct size was 28.9% ± 9.3%. After MI, rapid remodelling occurred in LVESV, LVEF, and sphericity for 2 weeks and LVEDV for 4 weeks, with slower changes afterwards. LV infarct size correlated with LVESV (r = 0.76), LVEDV (r = 0.71), and LVEF (r = 0.69). Larger infarcts resulted in greater LVESV dilation (P = 0.04) and faster LVEDV (P < 0.01), LVEF (P < 0.01), and sphericity (P < 0.01) remodelling. Apical global circumferential strain and wall motion score index increased for 1 week, then stabilized, regardless of infarct size, and apical global circumferential strain was correlated with apical infarction (r = 0.58). Additionally, regional circumferential strain decreased in segments with severe (> 80%) infarction more quickly (P < 0.01) and by a greater degree (P = 0.04) compared with segments with minor (< 20%) infarction.
CONCLUSIONS: The most dynamic remodelling of cardiac function in this model occurred during the first 4 weeks, stabilizing thereafter, with changes maintained up to 12 weeks. Infarct size affected both the early rate and long-term extent of mechanical remodelling.
Yves T Wang; Zoran B Popović; Igor R Efimov; Yuanna Cheng
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2012-01-21
Journal Detail:
Title:  The Canadian journal of cardiology     Volume:  28     ISSN:  1916-7075     ISO Abbreviation:  Can J Cardiol     Publication Date:    2012 Mar-Apr
Date Detail:
Created Date:  2012-03-21     Completed Date:  2012-07-05     Revised Date:  2014-09-18    
Medline Journal Info:
Nlm Unique ID:  8510280     Medline TA:  Can J Cardiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  230-8     Citation Subset:  IM    
Copyright Information:
Copyright © 2012 Canadian Cardiovascular Society. Published by Elsevier Inc. All rights reserved.
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MeSH Terms
Disease Models, Animal
Heart / physiopathology*
Longitudinal Studies
Myocardial Infarction / physiopathology*,  ultrasonography
Ventricular Remodeling / physiology*
Grant Support

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