Document Detail

Serial evaluation of myocardial thickening and thinning in acute experimental infarction: identification and quantification using two-dimensional echocardiography.
MedLine Citation:
PMID:  7083504     Owner:  NLM     Status:  MEDLINE    
Regional left ventricular function was studied serially by quantitative two-dimensional echocardiography (2-D echo) in 20 dogs after left anterior descending coronary artery ligation. Normal values for regional myocardial thickening were established in 20 healthy dogs and used as a standard to recognize abnormally contracting segments (ACS). In normal hearts, the mean percent thickening tended to increase from base (25.8%) to apex (34.0%), but showed considerable diversity from segment to segment (range 20.0-40.0%); nevertheless, at least some degree of thickening was seen in every segment. After coronary occlusion, myocardial segments either thinned or failed to thicken. At the papillary muscle level, there was an improvement in function between 2 and 48 hours, with thinning at 2 hours and thickening at 48 hours. Tissue infarct size (IS) determined at 48 hours was related to IS derived from a weighted summation of ACS at 2, 24 and 48 hours. At 2 hours, ACS considerably overpredicted and correlated poorly with tissue IS (25.3% vs 13.4%; r = 0.60); by 48 hours, IS predicted by ACS had decreased to 15.3% (p less than 0.05) and had an improved, but only fair correlation with tissue IS (r = 0.73, SEE = 4.9%). We conclude that there is considerable heterogeneity to myocardial thickening by 2-D-echo, but failure to thicken is not seen in the normal dog heart. In many dogs, the extent of myocardial dysfunction 2 hours after coronary ligation exceeds that seen later. Tissue IS is difficult to predict accurately from ACS. Since the amount of muscle dysfunction is not necessarily equivalent to the amount of tissue necrosis in acute myocardial infarction, ACS may be more appropriate used to tract the course of infarction rather than to predict IS.
M Nieminen; A F Parisi; J E O'Boyle; E D Folland; S Khuri; R A Kloner
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Circulation     Volume:  66     ISSN:  0009-7322     ISO Abbreviation:  Circulation     Publication Date:  1982 Jul 
Date Detail:
Created Date:  1982-08-07     Completed Date:  1982-08-07     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0147763     Medline TA:  Circulation     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  174-80     Citation Subset:  AIM; IM    
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MeSH Terms
Coronary Circulation
Coronary Vessels / pathology
Disease Models, Animal
Echocardiography / methods*
Heart Ventricles / pathology
Myocardial Infarction / pathology*
Myocardium / pathology
Grant Support

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

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