title: The sick sinus syndrome.
mesh_terms: D000319:Adrenergic beta-Antagonists / Q000627:therapeutic use; D000787:Angina Pectoris / Q000209:etiology; D001146:Arrhythmia, Sinus / Q000150:complications*; D001145:Arrhythmias, Cardiac; D001285:Atropine / Q000627:therapeutic use; D001919:Bradycardia / Q000150:complications; D004554:Electric Countershock; D006801:Humans; D010138:Pacemaker, Artificial; D012849:Sinoatrial Node; D013577:Syndrome; D013610:Tachycardia / Q000150:complications
chemical_list: D000319:Adrenergic beta-Antagonists; D001285:Atropine