title: Positive dromotropic effects of the vagus nerves on the canine atrioventricular node.
mesh_terms: D000319:Adrenergic beta-Antagonists / Q000494:pharmacology; D000818:Animals; D001285:Atropine / Q000494:pharmacology; D004285:Dogs; D004558:Electric Stimulation; D006329:Heart Conduction System / Q000502:physiology*; D010138:Pacemaker, Artificial; D011433:Propranolol / Q000494:pharmacology; D013564:Sympathetic Nervous System / Q000502:physiology; D014630:Vagus Nerve / Q000502:physiology*
chemical_list: D000319:Adrenergic beta-Antagonists; D001285:Atropine; D011433:Propranolol