植入式人工心脏瓣膜关闭音的声学分析。

Acoustic analysis of the closing sounds of implanted prosthetic heart valves.

作者信息

Reynolds K J, Stephen R O

机构信息

Department of Physiology, University of Leicester, England.

出版信息

J Acoust Soc Am. 1995 Jul;98(1):69-77. doi: 10.1121/1.413663.

DOI:10.1121/1.413663

PMID:7608408

Abstract

Previous in vitro studies [K. J. Reynolds, Ph.D. thesis (1994); K. J. Reynolds and R. O. Stephen, J. Acoust. Soc. Am. 97, 60-68 (1995)] have shown that it is possible to detect minor mechanical changes to a prosthetic heart valve by acoustic analysis of the valve's closing sounds. This current study investigates the sounds produced by prosthetic valves implanted in patients. To reduce signal distortion at the thoracic surface, recordings were made with the patient submerged in water. Results show that stable reproducible averaged spectra can be obtained from implanted valves provided recording conditions are kept constant. The respiration cycle does not affect the recorded spectrum.

摘要

先前的体外研究[K. J. 雷诺兹，博士论文（1994年）；K. J. 雷诺兹和R. O. 斯蒂芬，《美国声学学会杂志》97，60 - 68（1995年）]表明，通过对人工心脏瓣膜关闭声音进行声学分析，可以检测到瓣膜的微小机械变化。本研究调查了植入患者体内的人工瓣膜所产生的声音。为减少胸壁表面的信号失真，在患者浸入水中时进行记录。结果表明，只要记录条件保持恒定，就可以从植入的瓣膜获得稳定且可重复的平均频谱。呼吸周期不影响记录的频谱。