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midsystolic click
A high-pitched sound midsystolic sound heard best at the left sternal border & apex. It occurs in association with mitral valve prolapse & is often followed by a late systolic murmur.
General
abnormal heart sound
References
Harrison's Principles of Internal Medicine, 13th ed.
Companion Handbook, Isselbacher et al (eds), McGraw-Hill
Inc. NY, 1995, pg 327