A 15-Year-Old Boy Is Found to Have a Murmur During

A 15-year-old boy is found to have a murmur during a routine sports physical examination.  He has no complaints and has excellent exercise capacity.  His maternal uncle died while swimming at age 24.  The patient's blood pressure is 122/70 mm Hg and pulse is 63/min.  A faint midsystolic murmur is heard along the lower left sternal border when the patient is supine.  When the patient is asked to stand, a 3/6 systolic crescendo-decrescendo murmur is heard in the same location.  Which of the following is the most likely mitral valve abnormality in this patient?

A) Abnormal mitral leaflet motion
B) Dilated mitral valve annulus
C) Mitral annulus calcifications
D) Prolapse of the mitral valve leaflet
E) Rupture of chordae tendineae

Correct Answer:

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