title: An irregularly irregular cardiac rhythm in a man with a pacemaker.
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D018880:Atrial Premature Complexes / Q000175:diagnosis* / Q000209:etiology*; D003937:Diagnosis, Differential; D004562:Electrocardiography; D004867:Equipment Design; D006801:Humans; D008297:Male; D010138:Pacemaker, Artificial / Q000009:adverse effects*; D012017:Referral and Consultation