Document Detail

Aortic valve closure and cardiac vibrations in the genesis of the second heart sound.
MedLine Citation:
PMID:  6858903     Owner:  NLM     Status:  MEDLINE    
Simultaneous M-mode echocardiograms and external phonocardiograms were recorded in 15 healthy subjects to evaluate the genesis of the second heart sound. The onset of the second sound was found synchronous with the coaptation of the aortic valve cusps and a sharp vibration on the aortic wall. The closed valve was oscillating for 30 to 45 ms after the coaptation of the cusps. Magnified echocardiographic studies of the interventricular septum revealed a consistent, momentary quiver across the septal myocardium a mean of 4 ms after the onset of the second sound. In most subjects, a transient myocardial vibration was observed in temporal association with the first heart sound as well. The present observations suggest that the aortic valve closure initiates the production of the second heart sound, the main audible component resulting, however, from vibrations in the cardiac structures after the valve closure.
M Kupari
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The American journal of cardiology     Volume:  52     ISSN:  0002-9149     ISO Abbreviation:  Am. J. Cardiol.     Publication Date:  1983 Jul 
Date Detail:
Created Date:  1983-07-29     Completed Date:  1983-07-29     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0207277     Medline TA:  Am J Cardiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  152-4     Citation Subset:  AIM; IM    
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MeSH Terms
Aortic Valve / physiology*
Echocardiography / methods*
Heart Auscultation*
Heart Septum / physiology
Heart Sounds*

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

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