Document Detail

Physical characteristics of pulmonary artery stenosis murmurs in calves.
MedLine Citation:
PMID:  7386646     Owner:  NLM     Status:  MEDLINE    
To better understnad the characteristics of cardiovascular murmurs and turbulent energy transmission, we made simultaneous measurements of pressure (sound) and velocity fluctuations in the vicinity of surgically produced stenoses in the pulmonary artery of calves. We did a spectral analysis of these data and found an identifiable break frequency at which the slopes of the pressure fluctuations changed. By use of these break frequencies and the corresponding blood jet velocity and vessel diameter measurements, Strouhal numbers were calculated. The jet velocity, Reynolds number, Strouhal number, and unsteadiness parameter values changed when the vessel was stenosed. When the power spectrum curves for the velocity fluctuations and the sound were compared, they tended to show a correlation between break frequencies. We speculate that this apparent correlation indicated a transfer from turbulent to acoustic energy.
D R Gross; P C Lu; K T Dodd; N H Hwang
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The American journal of physiology     Volume:  238     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1980 Jun 
Date Detail:
Created Date:  1980-08-28     Completed Date:  1980-08-28     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  H876-85     Citation Subset:  IM    
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MeSH Terms
Biophysical Phenomena
Blood Pressure
Cattle / physiology*
Heart Auscultation*
Heart Sounds*
Pulmonary Artery / physiology*
Pulmonary Valve Stenosis / physiopathology*
Regional Blood Flow

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

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