Improvement in mitral regurgitation after aortic valve replacement

Area of Science:

• Cardiovascular Surgery
• Cardiac Surgery
• Valvular Heart Disease

Background:

• Concomitant mitral valve (MV) regurgitation is common in patients with aortic stenosis (AS).
• Additional MV surgery during aortic valve (AV) replacement carries high operative risk.
• Previous studies on MV regurgitation amelioration post-AV replacement used heterogeneous patient groups.

Purpose of the Study:

• To evaluate the effect of AV replacement for AS on the severity of concomitant MV regurgitation.
• To assess the need for additional MV surgery in patients with AS and MV regurgitation.

Main Methods:

• Retrospective review of echocardiography and Doppler data in 30 patients with severe AS.
• Exclusion criteria included prior MV surgery, organic MV disease, carotid disease, low ejection fraction, or significant AV regurgitation.
• Patients were stratified by MV regurgitation severity: mild (23 patients) and moderate (7 patients).

Main Results:

• A significant reduction in MV regurgitation area and percentage was observed post-AV replacement (P < 0.012 and P < 0.001, respectively).
• All patients with moderate MV regurgitation showed improvement after AV replacement.
• In the mild MV regurgitation group, 53% remained unchanged, and 47% improved.

Conclusions:

• Severe MV regurgitation was not present in this cohort of severe AS patients.
• For patients with severe AS and moderate MV regurgitation, additional MV surgery is likely unnecessary, particularly with preserved left ventricular function and no organic MV disease.
• The decision for MV intervention is straightforward in mild regurgitation cases.