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Time-frequency analysis of the first heart sound

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2 Author(s)
J. C. Wood ; Dept. of Pediatrics, Yale Univ., New Haven, CT, USA ; D. T. Barry

Quantitative phonocardiography has been limited by many factors: nonstandard nomenclature and recording techniques, complicated mechanoacoustic generation, propagation and coupling, and inherent heart sound nonstationarity. New nonstationary signal processing techniques provide a powerful tool for phonocardiography, particularly in regard to the first heart sound. Recent work supports the concept that the first heart sound is composed of valve-initiated myocardial traveling waves superimposed upon the acceleration of myocardial contraction. Clinically, nonstationary signal analysis has been most frequently applied toward the study of mechanical prosthetic valves. However, a better understanding of first heart sound mechanics may facilitate the diagnosis of myocardial and native-valve pathology. Given the inherent system complexity, an interdisciplinary approach incorporating physicians, mechanical engineers, seismologists, and electrical engineers is imperative

Published in:

IEEE Engineering in Medicine and Biology Magazine  (Volume:14 ,  Issue: 2 )