Letter: Sick sinus syndrome.
D001146:Arrhythmia, Sinus / Q000628:therapy*; D001919:Bradycardia / Q000628:therapy; D006801:Humans; D009203:Myocardial Infarction / Q000150:complications; D010138:Pacemaker, Artificial; D013610:Tachycardia / Q000628:therapy