A 62-year-old man presents to his cardiologist because of worsening exercise intolerance over the past 8 months. He reports that he previously walked 2 miles daily but now becomes short of breath after walking several blocks. He also notes increasing fatigue and occasional palpitations. His medical history is significant for mitral valve prolapse, hypertension, and hyperlipidemia. Current medications include lisinopril and atorvastatin. Temperature is 36.8°C (98.2°F), blood pressure is 124/68 mm Hg, pulse is 88/min, and respiratory rate is 16/min. Cardiac examination reveals a high-pitched holosystolic murmur best heard at the apex and radiating to the axilla. A mid-systolic click is also present. Mild bibasilar crackles are noted on lung examination. Laboratory studies are unremarkable. ECG demonstrates normal sinus rhythm.
Transthoracic echocardiography reveals the following:
Severe mitral regurgitation due to posterior leaflet prolapse
Left ventricular ejection fraction: 58%
Progressive left ventricular dilation compared with a study performed 1 year ago
Severe left atrial enlargement
Which of the following is the most appropriate next step in management?
The correct answer is:
C) Mitral valve repair or replacement
This patient has symptomatic severe primary mitral regurgitation due to mitral valve prolapse. His worsening exertional dyspnea, progressive ventricular remodeling, and severe regurgitation indicate that compensatory mechanisms are beginning to fail.
In chronic mitral regurgitation, the left ventricle initially adapts to volume overload through dilation and eccentric hypertrophy. During this compensated phase, patients may remain asymptomatic for years despite severe regurgitation. Over time, however, persistent volume overload leads to progressive ventricular dysfunction, atrial enlargement, pulmonary congestion, atrial fibrillation, and heart failure symptoms.
Progressive left ventricular dilation and declining ventricular performance further support the need for surgical management. When technically feasible, mitral valve repair is generally preferred over replacement because it preserves native valve structure and ventricular function while avoiding prosthetic valve complications.
Answer choice A: Continue annual echocardiographic surveillance, is incorrect.
Serial monitoring is appropriate for many asymptomatic patients with preserved ventricular function. However, this patient has developed exertional dyspnea and evidence of progressive ventricular remodeling, indicating that observation alone is no longer appropriate.
Answer choice B: Initiate long-term digoxin therapy, is incorrect.
Digoxin may be useful in selected patients with atrial fibrillation or HFrEF but does not address the underlying structural abnormality. Medical therapy cannot reverse severe degenerative mitral regurgitation.
Answer choice D: Start long-term amiodarone therapy, is incorrect.
Amiodarone is used for management of atrial and ventricular arrhythmias. This patient remains in sinus rhythm and has no indication for antiarrhythmic therapy. The primary issue is progressive valvular disease.
Answer choice E: Transcatheter aortic valve replacement, is incorrect.
Transcatheter aortic valve replacement (TAVR) is used for treatment of severe aortic stenosis. This patient’s pathology involves the mitral valve, not the aortic valve.
Key Learning Point
Symptomatic severe primary mitral regurgitation is an indication for valve intervention. Progressive ventricular dilation, atrial enlargement, and declining exercise tolerance suggest transition from compensated disease to clinically significant volume overload requiring mitral valve repair or replacement.
