title: [An etiologic study of flail valve leaflet change].
mesh_terms: D000293:Adolescent; D000328:Adult; D001021:Aortic Valve; D004452:Echocardiography; D004697:Endocarditis, Bacterial / Q000150:complications; D005260:Female; D006349:Heart Valve Diseases / Q000209:etiology*; D006801:Humans; D008297:Male; D008943:Mitral Valve; D012214:Rheumatic Heart Disease / Q000150:complications