title: Natural history and indications for surgery in aortic valvar disease.
mesh_terms: D001022:Aortic Valve Insufficiency / Q000000981:diagnostic imaging / Q000209:etiology / Q000601:surgery*; D001024:Aortic Valve Stenosis / Q000000981:diagnostic imaging / Q000209:etiology / Q000601:surgery*; D002312:Cardiomyopathy, Hypertrophic / Q000000981:diagnostic imaging / Q000209:etiology / Q000601:surgery; D004562:Electrocardiography; D006350:Heart Valve Prosthesis; D006801:Humans; D011859:Radiography