Objective: To find out the clinical significance of the third (S3) and fourth (S4) heart sounds.

目的：研究第三(S3)第四(S4)心音在临床上的意义。

youdao

Objective: To find out the clinical significance of the third (S3) and fourth (S4) heart sounds.

目的：研究第三(S3)第四(S4)心音在临床上的意义。

youdao