title: Antiarrhythmic activity of four pteridine compounds in ouabain intoxication.
abstract: The antiarrhythmic effects of 4 pteridine analogues, 2 of which are potassium-sparing diuretics, triamterene (2, 4, 7-triamino-6-phenylpteridine) and [2-phenyl-4, 7 diaminopteridine-6-(N-diethylaminoethyl) carboxamide] and 2 of which have no diuretic effects [2-phenyl-4, 7-diaminopteridine-6-(N-2-hydroxyethyl) carboxamide], on ouabain-induced ventricular tachycardia in intact pentobarbital-anesthetized dogs were investigated. Ouabain was given as a continuous infusion 2 mug/kg/min intravenously until 5 min after the onset of a sustained ventricular tachycardia. It was found that both 6-(N-dimethylaminopropyl) and 6-(N-diethylaminoethyl) carboxamide derivates of the pteridine had a significant protective effect against ouabain-induced ventricular tachycardia in dogs that had been pretreated with a dose of 5 mg/kg intravenously. At this dose the 2 pteridine compounds with diuretic activity exhibited a transient antiarrhythmic effect in abolishing the ouabain-induced ventricular tachycardia while those without diuretic properties failed to suppress the ventricular tachycardia.
mesh_terms: D000818:Animals; D001145:Arrhythmias, Cardiac / Q000139:chemically induced / Q000188:drug therapy*; D001283:Atrioventricular Node / Q000187:drug effects; D003864:Depression, Chemical; D004285:Dogs; D004562:Electrocardiography; D006329:Heart Conduction System / Q000187:drug effects; D006339:Heart Rate / Q000187:drug effects; D006352:Heart Ventricles / Q000187:drug effects; D006863:Hydrogen-Ion Concentration; D010042:Ouabain / Q000506:poisoning*; D011621:Pteridines / Q000627:therapeutic use*; D013610:Tachycardia / Q000139:chemically induced; D014223:Triamterene / Q000627:therapeutic use
chemical_list: D011621:Pteridines; D010042:Ouabain; D014223:Triamterene