Document Detail

Clinical evaluation of left ventricular function using the cardiac helical fiber model: an echocardiographic study.
MedLine Citation:
PMID:  4072879     Owner:  NLM     Status:  MEDLINE    
The cardiac helical fiber concept was introduced in 1969 and was shown mathematically to provide better approximations of normal ejection fractions compared with the conventional circumferential fiber model. The clinical applicability of this concept was evaluated noninvasively by M-mode and two-dimensional echocardiography in 55 subjects: 10 with aortic insufficiency, 10 with congestive cardiomyopathy, eight with hypertension, eight who were long-distance runners, 12 who were active and seven who were sedentary normals. Comparison of myocardial shortening by the circumferential and helical fiber models showed that the former discriminated only two groups of subjects, while endocardial and epicardial helical shortening discriminated three and four groups, respectively. Regression analyses suggest that more than 90% (r2 = 0.92) of variation in ejection fraction may be accounted for by variation in endocardial shortening, and that more than 75% (r2 = 0.77) of variation in observed endocardial shortening may be accounted for by variation in epicardial contraction. The study demonstrates that the helical fiber length concept may be useful for the noninvasive evaluation of left ventricular function in man.
J Jobin; M K Heng; J Martin; H L Wyatt; P L Lee
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  American heart journal     Volume:  110     ISSN:  0002-8703     ISO Abbreviation:  Am. Heart J.     Publication Date:  1985 Dec 
Date Detail:
Created Date:  1985-12-31     Completed Date:  1985-12-31     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0370465     Medline TA:  Am Heart J     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1226-33     Citation Subset:  AIM; IM    
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MeSH Terms
Cardiac Output
Echocardiography / methods*
Heart Function Tests
Middle Aged
Models, Theoretical
Myocardial Contraction*
Ventricular Function*

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

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