Sick sinus (brady cardia-tachycardia) syndrome.
D000368:Aged; D001919:Bradycardia / Q000628:therapy*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial; D013577:Syndrome; D013610:Tachycardia / Q000628:therapy*