title: Action of verapamil on sinus node, atrioventricular, and intraventricular conduction.
mesh_terms: D000328:Adult; D000368:Aged; D000526:Alprenolol / Q000494:pharmacology; D001145:Arrhythmias, Cardiac / Q000188:drug therapy*; D001285:Atropine / Q000494:pharmacology; D004562:Electrocardiography; D006327:Heart Block / Q000139:chemically induced; D006329:Heart Conduction System / Q000187:drug effects*; D006801:Humans; D008875:Middle Aged; D010138:Pacemaker, Artificial; D012849:Sinoatrial Node / Q000187:drug effects; D014700:Verapamil / Q000627:therapeutic use*
chemical_list: D001285:Atropine; D000526:Alprenolol; D014700:Verapamil