A 46-year-old man has dyspnea, orthopnea, and a midsystolic murmur that is best heard over the cardiac apex. An ECG shows a left atrial abnormality. Echocardiography shows an enlarged left atrium and a normally sized left ventricle. Which of the following is the most likely cause of these findings?
A) Aortic regurgitation
B) Aorticstenosis
C) Mitra! regurgitation
D) Mitra!s!enosis
E) Ventricular septa! defect
A 46-year-old man has dyspnea, orthopnea, and a midsystolic murmur that is best heard over the cardiac apex. An ECG show
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