title: [STUDIES ON THE DURATION OF THE HEART CYCLE IN MITRAL LESIONS USING THE ELECTROMYOGRAPHIC METHOD].
mesh_terms: D004571:Electrokymography; D006321:Heart; D006801:Humans; D008944:Mitral Valve Insufficiency; D008946:Mitral Valve Stenosis
keywords: ELECTROKYMOGRAPHY; MITRAL VALVE INSUFFICIENCY; MITRAL VALVE STENOSIS
vernacular_title: IZUCHENIE PRODOLZHITEL'NOSTI FAZ SERDECHNOGO TSIKLA PRI MITRAL'NYKH POROKAKH METODOM 'ELEKTROKIMOGRAFII.