[Electrocardiogram of the month].
D000368:Aged; D000369:Aged, 80 and over; D004562:Electrocardiography / Q000379:methods; D005260:Female; D006327:Heart Block / Q000175:diagnosis / Q000000981:diagnostic imaging* / Q000503:physiopathology; D006801:Humans; D010138:Pacemaker, Artificial; D011859:Radiography