title: Cardiac conduction in patients with symptomatic sinus node disease.
mesh_terms: D000368:Aged; D001146:Arrhythmia, Sinus / Q000503:physiopathology* / Q000628:therapy; D001285:Atropine / Q000627:therapeutic use; D002037:Bundle-Branch Block / Q000503:physiopathology; D004077:Digoxin / Q000627:therapeutic use; D004562:Electrocardiography; D005260:Female; D006327:Heart Block / Q000209:etiology; D006329:Heart Conduction System / Q000503:physiopathology*; D006339:Heart Rate / Q000187:drug effects; D006801:Humans; D008297:Male; D008750:Methyldopa / Q000627:therapeutic use; D008875:Middle Aged; D010138:Pacemaker, Artificial; D012849:Sinoatrial Node / Q000503:physiopathology*
chemical_list: D008750:Methyldopa; D004077:Digoxin; D001285:Atropine