title: [Extrasystolic arrhythmia in practically healthy persons over 50 according to materials of many years of clinico-electrocardiographic observation].
mesh_terms: D000367:Age Factors; D000368:Aged; D005117:Cardiac Complexes, Premature / Q000175:diagnosis*; D004562:Electrocardiography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D013997:Time Factors
vernacular_title: Ekstrasistolicheskaia aritmiia u liudeĭ starshe 50 let po materialam mnogoletnego elektrokardiograficheskogo nabliudeniia.