title: Relationship between PP and PQ intervals in the electrocardiogram of dogs.
mesh_terms: D000818:Animals; D001285:Atropine / Q000008:administration & dosage / Q000494:pharmacology; D004283:Dog Diseases / Q000139:chemically induced; D004285:Dogs / Q000502:physiology*; D004562:Electrocardiography / Q000662:veterinary*; D006327:Heart Block / Q000139:chemically induced / Q000662:veterinary; D006329:Heart Conduction System / Q000502:physiology; D006339:Heart Rate / Q000187:drug effects; D007275:Injections, Intravenous; D012119:Respiration; D012890:Sleep; D014630:Vagus Nerve / Q000502:physiology
chemical_list: D001285:Atropine