The amplitude of first heart sound is a normal measurement of cardiac contractility, and phonocardiogram (PCG) can be used in the study of cardiac contractility reserve.
第一心音的幅值是心脏收缩能力的标准度量，心音图(PCG)可以用于心力储备的研究。
The amplitude of first heart sound is a normal measurement of cardiac contractility, and phonocardiogram (PCG) can be used in the study of cardiac contractility reserve.
第一心音的幅值是心脏收缩能力的标准度量，心音图(PCG)可以用于心力储备的研究。
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