title: Atropine-induced bradycardia in the guinea pig: dose-response.
abstract: The effect of atropine sulfate on the heart rate of the unanesthetized guinea pig was studied using a wide range of doses injected via a chronic jugular cannula; dose-response data are presented for the range of 5 mg/kg to 50 mg/kg. A long-lasting dose-dependent bradycardia was produced. This finding is in contrast to the clasically reported effect of atropine in man and dog: tachycardia sometimes preceded by a transient bradycardia. Thus, the guinea pig may be an excellent model for the study of parasympathomimetic, bradycardia-producing effects of atropine.
mesh_terms: D000818:Animals; D001285:Atropine / Q000008:administration & dosage / Q000494:pharmacology*; D002404:Catheterization; D003864:Depression, Chemical; D004305:Dose-Response Relationship, Drug; D005260:Female; D006168:Guinea Pigs; D006339:Heart Rate / Q000187:drug effects*; D007601:Jugular Veins; D013997:Time Factors
chemical_list: D001285:Atropine