title: Effect of tetrodotoxin on A-V conduction and A-V junctional rhythm.
mesh_terms: D000109:Acetylcholine / Q000494:pharmacology; D000818:Animals; D004285:Dogs; D004562:Electrocardiography; D006327:Heart Block / Q000139:chemically induced; D006329:Heart Conduction System / Q000187:drug effects*; D009638:Norepinephrine / Q000494:pharmacology; D010477:Perfusion; D010830:Physostigmine / Q000494:pharmacology; D012110:Reserpine / Q000494:pharmacology; D013564:Sympathetic Nervous System / Q000187:drug effects; D013779:Tetrodotoxin / Q000494:pharmacology*; D014439:Tyramine / Q000494:pharmacology; D014630:Vagus Nerve / Q000187:drug effects
chemical_list: D013779:Tetrodotoxin; D012110:Reserpine; D010830:Physostigmine; D000109:Acetylcholine; D009638:Norepinephrine; D014439:Tyramine