title: The relationship among cardiac pacemakers. Overdrive suppression.
mesh_terms: D000818:Animals; D001001:Anura; D002118:Calcium / Q000502:physiology; D002415:Cats; D004285:Dogs; D006327:Heart Block / Q000503:physiopathology*; D006329:Heart Conduction System / Q000502:physiology* / Q000503:physiopathology; D006339:Heart Rate; D006801:Humans; D012848:Sinoatrial Block / Q000503:physiopathology; D012849:Sinoatrial Node / Q000502:physiology* / Q000503:physiopathology; D012964:Sodium / Q000502:physiology; D014630:Vagus Nerve / Q000502:physiology
chemical_list: D012964:Sodium; D002118:Calcium