title: [Alternatingly changing shape of QRS complex during attacks of atrial fibrillation].
mesh_terms: D000368:Aged; D001281:Atrial Fibrillation / Q000150:complications / Q000503:physiopathology*; D002037:Bundle-Branch Block / Q000150:complications; D004562:Electrocardiography; D006329:Heart Conduction System / Q000503:physiopathology; D006801:Humans; D008297:Male
vernacular_title: Nz przemian zmienny kształt zespołow QRS w czasie napadów migotania przedsionków.