Surgical Indications for Mitral Valve Replacement in Congestive Heart Disease with Mitral Regurgitation

Primary Mitral Regurgitation

The American College of Cardiology recommends surgery for symptomatic patients with severe mitral regurgitation and LVEF >30%, and for asymptomatic patients with LV dysfunction (LVEF 30-60% or LVESD ≥40 mm), with mitral valve repair strongly preferred over replacement when technically feasible 1, 2, 3
Surgery is mandatory for all symptomatic patients with severe primary MR and LVEF >30% (Class I recommendation) 1, 2, 4
Symptoms include decreased exercise tolerance, exertional dyspnea, or heart failure 4
Severe MR is defined by: vena contracta ≥0.7 cm, regurgitant volume ≥60 mL, regurgitant fraction ≥50%, or ERO ≥0.40 cm² 4
Surgery is required when LVEF falls to 30-60% and/or LVESD ≥40 mm to prevent irreversible ventricular damage 1, 2, 4
For patients of small stature, adjust LVESD threshold to 22 mm/m² body surface area 5
Surgery is reasonable when new-onset atrial fibrillation develops 1, 5
Surgery is reasonable when resting pulmonary hypertension (PA systolic pressure >50 mmHg) is present 1, 5

The European Heart Journal indicates that medical optimization is necessary before considering surgery for secondary MR, including ACE inhibitors/ARBs, beta-blockers, and aldosterone antagonists 4, 5
Cardiac resynchronization therapy must be implemented if the patient meets device indications 4, 5
Reassess MR severity after medical optimization, as it may improve significantly 4
Surgery is indicated when severe secondary MR is present in patients already undergoing CABG with LVEF >30% (Class I recommendation) 2, 3, 4
Isolated mitral valve surgery may be considered for severely symptomatic patients (NYHA III-IV) who remain symptomatic despite optimal medical therapy, but this is a weaker recommendation (Class IIb) 4, 5

The American College of Cardiology recommends mitral valve repair over replacement in all scenarios where durable repair is achievable 1, 4
Repair is mandatory when primary MR is limited to the posterior leaflet 1, 4
Repair is preferred for anterior leaflet or bileaflet involvement when successful, durable repair is possible 1, 4

The American College of Cardiology indicates that concomitant mitral valve repair or replacement is indicated for severe primary MR 1
Concomitant repair is reasonable even for moderate primary MR 1
For severe secondary MR with LVEF >30%, concomitant surgery is indicated during CABG 2, 3, 5