title: Pharmacologic actions of tetrodotoxin studied by direct perfusion of the sinus node.
mesh_terms: D000200:Action Potentials / Q000187:drug effects; D000818:Animals; D001919:Bradycardia / Q000139:chemically induced; D004285:Dogs; D004562:Electrocardiography; D005725:Ganglia, Autonomic / Q000187:drug effects; D006327:Heart Block / Q000139:chemically induced; D006329:Heart Conduction System / Q000187:drug effects*; D010477:Perfusion; D009435:Synaptic Transmission; D013779:Tetrodotoxin / Q000494:pharmacology*; D014630:Vagus Nerve / Q000187:drug effects
chemical_list: D013779:Tetrodotoxin