title: The timing of surgical intervention in chronic mitral regurgitation.
mesh_terms: D006350:Heart Valve Prosthesis; D006801:Humans; D008943:Mitral Valve; D008944:Mitral Valve Insufficiency / Q000401:mortality / Q000601:surgery*; D009200:Myocardial Contraction; D013318:Stroke Volume; D013997:Time Factors