Which midsystolic click at the apex indicates which condition?

• A. Aortic Regurgitation
• B. Mitral Regurgitation
• C. Mitral Valve Prolapse
• D. Pulmonary Stenosis

Answer: (C)

A midsystolic click heard at the apex points to mitral valve prolapse. This sound comes from the mitral valve leaflets billowing back into the left atrium during systole and the sudden tension of the chordae as the leaflets snap into place, producing the click. The apex location corresponds to the mitral valve area, so this timing and location are classic for MVP. If mitral regurgitation accompanies it, you’ll hear a late systolic murmur after the click. Other conditions don’t produce this pattern: aortic regurg gives an early diastolic murmur, pulmonary stenosis is a systolic murmur best at the left upper sternal border, and mitral regurg is a holosystolic murmur at the apex rather than a midsystolic click.