title: Timing of surgery in chronic mitral and aortic regurgitation.
mesh_terms: D001022:Aortic Valve Insufficiency / Q000175:diagnosis / Q000601:surgery*; D002908:Chronic Disease; D006350:Heart Valve Prosthesis; D006439:Hemodynamics; D006801:Humans; D008944:Mitral Valve Insufficiency / Q000175:diagnosis / Q000601:surgery*; D009200:Myocardial Contraction; D011183:Postoperative Complications / Q000175:diagnosis; D011379:Prognosis