Document Detail

Real-time sound spectroanalysis for diagnosis of malfunctioning prosthetic valves.
MedLine Citation:
PMID:  7366234     Owner:  NLM     Status:  MEDLINE    
A newly developed real-time sound spectroanalyzer was found to be capable of diagnosing malfunction of prosthetic heart valves. Sound spectroanalysis is believed to be superior to other methods such as phonocardiography and echocardiography. This system, developed in our institute, allows display on a cathode ray oscilloscope of five different modes of the valvular click, including the sound spectrograph and section pattern. Analysis of the section pattern allows measurement of the high-frequency components of the valvular click, which is normalized so as to be applicable to a click of any intensity. This parameter is called normalized maximal frequency (NMF). Sound spectroanalyses were carried out 228 times on 127 patients having a prosthetic heart valve. NMF values of normally functioning valves differed characteristically according to the type of valve, but did not change during the postoperative time course. Three of seven patients who had cerebral embolism showed significantly lower NMF values than normal, as did all four patients whose valve had become thrombosed.
Y Kagawa; N Sato; S Nitta; T Hongo; M Tanaka; H Mohri; T Horiuchi
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of thoracic and cardiovascular surgery     Volume:  79     ISSN:  0022-5223     ISO Abbreviation:  J. Thorac. Cardiovasc. Surg.     Publication Date:  1980 May 
Date Detail:
Created Date:  1980-06-16     Completed Date:  1980-06-16     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0376343     Medline TA:  J Thorac Cardiovasc Surg     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  671-9     Citation Subset:  AIM; IM    
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MeSH Terms
Atrial Fibrillation / diagnosis
Heart Auscultation*
Heart Sounds*
Heart Valve Diseases / surgery*
Heart Valve Prosthesis*
Intracranial Embolism and Thrombosis / diagnosis
Postoperative Complications / diagnosis*
Prosthesis Design
Thrombosis / diagnosis

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

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