第四心音是心房肌在收缩末期为克服心室舒张末期压力而用力收缩所产生的震动，也称心房音。
第四心音与左室功能损害及室壁的顺应性差有关。
Fourth heart sound correlated with damage of left ventricular function and compliance.
临床实验表明，利用驻极体传声器基本上能采集到正常的第一、第二心音，但对有病理信息的第三、第四心音却不易正确采集到，这与患者性别和胖、瘦等因素均有关系。
The clinical experiments have indicated that the first and second heart sound can be almost acquired by the microphone, but it is difficult for the third and fourth, w…
目的：研究第三(S3)第四(S4)心音在临床上的意义。
Objective: To find out the clinical significance of the third (S3) and fourth (S4) heart sounds.
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