A 52-year-old man with a 10-year history of hypertension presents with a 3-month history of progressive dyspnea on exertion and orthopnea. On cardiac examination, a late systolic murmur is heard at the apex, which increases with standing. Echocardiography shows an ejection fraction of 35%, severe mitral regurgitation, and left ventricular end-systolic diameter (LVESd) of 52 mm. He is currently on lisinopril 10 mg daily. What is the most appropriate next step in management?

Explanation

## Clinical Context This patient has **symptomatic secondary (functional) mitral regurgitation** with **severely reduced ejection fraction (35%)**, **severe LV dilatation (LVESd 52 mm)**, and signs of heart failure decompensation (orthopnea, dyspnea on exertion). ## Surgical Criteria Met **Key Point:** This patient meets the indication for mitral valve intervention: - Symptomatic MR (orthopnea, DOE) + LVEF ≤35% + severe LV dilatation (LVESd >40 mm) - Current medical therapy (ACE inhibitor monotherapy) is insufficient **High-Yield:** In secondary MR with severely reduced LVEF, the decision to operate is based on: 1. **Symptom severity** (present: NYHA Class III–IV) 2. **LV dysfunction** (LVEF ≤35%) 3. **Structural remodeling** (LVESd ≥40 mm) 4. **Failure of optimal medical therapy** (needs beta-blocker, aldosterone antagonist) When these criteria are met, surgical intervention (mitral repair or replacement) is indicated, even with low LVEF, because: - Reduces afterload and improves LV mechanics - Halts progressive remodeling - Improves survival compared to medical therapy alone ## Appropriate Next Step **Clinical Pearl:** Before surgical referral, the patient must be **optimized medically** with: - Beta-blockers (carvedilol, metoprolol) — reduce mortality in HF - Aldosterone antagonist (spironolactone) — reduces remodeling - ACE inhibitor continuation — already on lisinopril - Diuretics for symptom relief Once optimized (typically 4–8 weeks), the patient is referred for surgical evaluation. Mitral **repair** is preferred over replacement when anatomically feasible because it preserves LV function better. ## Why Not Other Options | Option | Why Wrong | |--------|----------| | Increase lisinopril + spironolactone alone | Medical therapy alone will not halt progressive remodeling in severe MR with LVEF 35%. Surgery is indicated. | | Inotropic support + transplant | Dobutamine is only for acute decompensation/cardiogenic shock, not chronic HF. Transplant is last-resort; this patient is a surgical candidate. | | Stress echo | Functional capacity testing is not the priority. The diagnosis and surgical indication are already clear. | **Mnemonic:** **SEVERE MR + Low EF = SURGERY** (after medical optimization) [cite:Harrison 21e Ch 297]