title: The sick sinus and ailing atrium.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001145:Arrhythmias, Cardiac / Q000175:diagnosis / Q000628:therapy; D001919:Bradycardia / Q000175:diagnosis / Q000628:therapy; D002648:Child; D004071:Digitalis Glycosides / Q000627:therapeutic use; D004562:Electrocardiography; D004594:Electrophysiology; D005080:Exercise Test; D005260:Female; D006331:Heart Diseases / Q000628:therapy; D006801:Humans; D008297:Male; D008875:Middle Aged; D010101:Oxygen Consumption; D010138:Pacemaker, Artificial; D012849:Sinoatrial Node / Q000503:physiopathology; D013577:Syndrome; D013610:Tachycardia / Q000175:diagnosis / Q000628:therapy
chemical_list: D004071:Digitalis Glycosides