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.
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…
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