S4.The fourth heart sound (S4, atrial gallop, presystolic gallop) is also the result of altered ventricular compliance.Its cadence has been likened to the soft a of appendix.
S4第四心音，又叫房
，收缩期前，也是心室顺应改变
结果。
S4.The fourth heart sound (S4, atrial gallop, presystolic gallop) is also the result of altered ventricular compliance.Its cadence has been likened to the soft a of appendix.
S4第四心音，又叫房，收缩期前，也是心室顺应改变结果。
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