Prolonged sinoatrial pauses.
D001919:Bradycardia / Q000503:physiopathology / Q000628:therapy*; D006801:Humans; D010138:Pacemaker, Artificial; D012849:Sinoatrial Node / Q000503:physiopathology*; D013575:Syncope / Q000503:physiopathology; D013997:Time Factors