The sick sinus syndrome.
D001146:Arrhythmia, Sinus / Q000503:physiopathology / Q000628:therapy; D001341:Autonomic Nervous System / Q000503:physiopathology; D002036:Bundle of His / Q000503:physiopathology; D004562:Electrocardiography; D006327:Heart Block / Q000503:physiopathology; D006329:Heart Conduction System / Q000503:physiopathology*; D006801:Humans; D008991:Monitoring, Physiologic; D010138:Pacemaker, Artificial; D012848:Sinoatrial Block / Q000503:physiopathology / Q000628:therapy; D012849:Sinoatrial Node / Q000503:physiopathology