Sick sinus syndrome.
D000328:Adult; D000368:Aged; D001146:Arrhythmia, Sinus / Q000175:diagnosis / Q000503:physiopathology* / Q000628:therapy; D001919:Bradycardia / Q000503:physiopathology; D002304:Cardiac Pacing, Artificial; D003937:Diagnosis, Differential; D004562:Electrocardiography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012848:Sinoatrial Block / Q000503:physiopathology; D012849:Sinoatrial Node / Q000503:physiopathology; D013610:Tachycardia / Q000503:physiopathology