title: [Surgery of chronic aortic regurgitation: assessment of the natural history, surgical indication and effect of surgery on the basis of echocardiographic findings].
mesh_terms: D001021:Aortic Valve / Q000503:physiopathology; D001022:Aortic Valve Insufficiency / Q000503:physiopathology / Q000601:surgery*; D004452:Echocardiography; D006801:Humans; D011379:Prognosis