Preoperative Predictors of Late Postoperative Outcome among Patients with Nonischemic Mitral Regurgitation with 'High Risk' Descriptors and Comparison with Unoperated Patients

Does mitral valve replacement or repair improve survival compared to medical treatment in high-risk patients with chronic nonischemic mitral regurgitation?

In high-risk patients with chronic nonischemic mitral regurgitation and ventricular dysfunction, mitral valve surgery significantly improves long-term survival compared to medical therapy, with preoperative right ventricular ejection fraction serving as a key predictor of postoperative mortality.