Figure 199o

A midsystolic nonejection sound C occurs in mitral valve prolapse and is followed by the late systolic murmur that crescendos to S2. With the assumption of the upright posture venous return decreases, the heart size become smaller, the C point moves closer to S1 and the mitral regurgitant murmur has an earlier onset. With prompt squatting both venous return and afterload increase, the heart becomes larger, the C moves toward S2,and the duration of the murmur shortens.

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