In vitro sound spectral analysis of prosthetic heart valves by mock circulatory system.
10.3349/ymj.1994.35.3.271
- Author:
Sang Hyun KIM
1
;
Byung Chul CHANG
;
Gyerae TACK
;
Jae Man HUH
;
Meyun Shick KANG
;
Bum Koo CHO
;
Young Hwan PARK
Author Information
1. Cardiovascular Research Institute, Yonsei University College of Medicine, Seoul, Korea.
- Publication Type:Original Article ; Comparative Study ; Research Support, Non-U.S. Gov't
- Keywords:
Fast Fourier trasform;
spectral analysis;
mock circulatory system
- MeSH:
Comparative Study;
Fourier Analysis;
*Heart Sounds;
*Heart Valve Prosthesis;
Human;
*Models, Cardiovascular;
Signal Processing, Computer-Assisted
- From:Yonsei Medical Journal
1994;35(3):271-278
- CountryRepublic of Korea
- Language:English
-
Abstract:
A comparative study was made of the sounds produced by normal prosthetic valves (St. Jude Medical, Bjork-Shiley, polymer) with those produced by the same valves but having simulated thrombosis at the stent, hinge, or strut. Comparisons of the closing sound were made for the power frequency spectra associated with individual valves. We used periodogram approach to obtain the spectral characteristics of the valve prostheses. The closing sound of the abnormal mechanical valves displayed lower apparent peak frequency. But the abnormal polymer valve produced higher apparent peak frequency. The results showed that frequency spectra gave information pertinent to the simulated malfunction. Sound spectral analysis is believed to be a simple and a good diagnostic tool for detection of prosthetic valve malfunction. Also it seemed to be superior to other methods such as phonocardiography and echocardiography.
