## Clinical Assessment This patient has **symptomatic severe mitral regurgitation with reduced ejection fraction (EF 35%)** and **NYHA Class III symptoms** despite optimal medical therapy with an ACE inhibitor and beta-blocker. ### Key Point: **Symptomatic severe MR with EF ≤40% is a Class I indication for surgical intervention** (valve repair or replacement), regardless of whether the patient is on maximal medical therapy. Medical management alone cannot prevent progressive ventricular dysfunction in severe organic MR. ### High-Yield: Indications for surgery in mitral regurgitation: | Indication | EF | Symptoms | Recommendation | |---|---|---|---| | Severe MR, primary (organic) | Any | Symptomatic | **Surgery** | | Severe MR, primary | >60% | Asymptomatic | Surgery if EF declining or LA dilated | | Severe MR, primary | ≤40% | Any | **Surgery** (Class I) | | Severe MR, secondary (functional) | <30% | Symptomatic | Surgery + revascularization/CRT | ### Clinical Pearl: In primary (organic) MR due to structural valve disease, the regurgitant volume itself causes progressive LV dilatation and dysfunction. Surgery should not be delayed until EF falls further, as this worsens surgical outcomes and prognosis. ### Mnemonic: **SEVERE MR + REDUCED EF = SURGERY** - Symptomatic + EF ≤40% → Class I for valve surgery - Repair preferred over replacement if anatomy permits ### Rationale for Correct Answer: Referral for mitral valve repair/replacement is the standard of care because: 1. He meets Class I indication: severe MR + NYHA III symptoms + EF 35% 2. Medical therapy has been optimized (ACE-I + beta-blocker) 3. Delaying surgery risks further EF decline and increased perioperative risk 4. Repair is preferred over replacement if the valve is repairable (typically in degenerative MR) [cite:Harrison 21e Ch 282] 
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