Document Detail

The quality of resonance of the first heart sound after myocardial infarction: clinical significance.
MedLine Citation:
PMID:  436206     Owner:  NLM     Status:  MEDLINE    
Frequency analyses of the first heart sound (S1) were performed in 80 normal subjects and 80 postinfarction patients. A readily recognizable frequency pattern characterized by a quality of resonance greater than or equal to 2, as measured by the Q factor at 3 db down, was noted in 78 of the 80 apparently normal subjects. An aberrant pattern with a Q less than 2, often accompanied by a lowering of the frequency content, was found in 78 of 80 postinfarction patients. We propose that the quality of resonance of S1 is a measure of the degree to which the structural homogeneity of the left ventricle as a compliant contractile unit has been preserved after myocardial infarction.
W F Renner; G W Renner
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Circulation     Volume:  59     ISSN:  0009-7322     ISO Abbreviation:  Circulation     Publication Date:  1979 Jun 
Date Detail:
Created Date:  1979-07-28     Completed Date:  1979-07-28     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0147763     Medline TA:  Circulation     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1144-8     Citation Subset:  AIM; IM    
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MeSH Terms
Electric Conductivity
Heart Auscultation*
Heart Sounds*
Middle Aged
Myocardial Infarction / physiopathology*

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

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