title: [Studies of pre- and post-operative cardiac function of valvular heart disease by echocardiography (author's transl)].
mesh_terms: D000328:Adult; D004452:Echocardiography; D005260:Female; D006349:Heart Valve Diseases / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged