運動負荷心音図の研究(第1編) : 運動負荷心音図の臨床的研究

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  • Effects of Exercise on Phonocardiogram : (1) Clinical studies on the Phonocardiographic response to exercise test

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Studies on the phonocardiogram in hypertension and coronary insufficiency already have been reported by many authors. It seems, however, that only a few works have been reported on the phonocardiographic response to exercise test. The author assumed that the phonocardiogram should be affected by the changes in dynamics of circulation due to exercise test. Therefore, this study was undertaken in an attempt to record phonocardiographically the reaction of cardiac muscle which occurred with exercise in these diseases and to obtain findings useful for anticipation of their prognosis. For this purpose, phonocardiographic observation were performed before and after exercise test. (1) Clinical studies on the phonocardiographic response to exercise test Methods : Coronary insufficiency 41 (first group), hypertension complicated with arterioscrelosis 48 (second group), essential hypertension 19 (third group), hyperthyroidism 16 (fourth group), normal control 17 (fifth group). These five groups of subjects were observed. These subjects performed exercises consisting of streching and bending the extremities in a supine position 60 times per minute for 5 minutes. Blood pressure, phonocardiogram simultaneously with electrocardiogram, amplitude of first heart sound and second heart sound Q-I interval, I-II interval, II-I interval, and Q-II interval were recorded immediately and, at 2-, 4-, 6- and 10 minutes after exercise. On the subjects of the first and second components where the first heart sound could be distinctly recognized, the first and second components were called respectively as IA and IM and intervals from Q-wave of electrocardiogram were recorded as Q-IM interval and Q-IA interval.

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