Late systolic murmurs begin in midsystole and extend to or through S2. They may be heard in mitral valve prolapse( frequently accompanied by midsystolic clicks) or coarctation of the aorta.

• 收缩期晚期杂音始于收缩期中期，延至或贯穿S2。可在二尖瓣脱垂（常伴有收缩中期喀喇音）主动脉瓣缩缝时听到。