title: [ECG changes during muscular activity of patients with mitral valve defects].
mesh_terms: D000293:Adolescent; D000328:Adult; D004562:Electrocardiography; D005081:Exercise Therapy; D006321:Heart / Q000503:physiopathology*; D006801:Humans; D008875:Middle Aged; D008944:Mitral Valve Insufficiency / Q000503:physiopathology* / Q000628:therapy; D005082:Physical Exertion
vernacular_title: Izmeneniia EKG vo vremia myshechnoĭ deiatel'nosti bol'nykh s porokami mitral'nogo klapana.