title: Antiarrhythmic and arrhythmogenic action of inosine in experimental ventricular tachyarrhythmias.
abstract: OBJECTIVE
  To study the possible action of inosine on experimental ventricular tachyarrhythmias.
  
  
  METHODS
  We used 92 mongrel dogs weighing 13 kg-17 kg, anesthetized with 30 mg/kg sodium pentobarbital applied intravenously. Myocardial lesions were induced by injecting 1 ml-1.5 ml of 70% phenol in the free wall of the left ventricle. In 36 dogs, the ventricular arrhythmia (VT) was induced 30 min later with aconitine crystals inserted into the periphery of the damaged area; in 16, VT was due only to myocardial damage and in the other 13 VT was spontaneously originated. Twenty-nine animals constituted the control group; no inosine was administered to them. The possible effects of inosine were studied in 63 animals. Leads II, aVR or aVL, right and Left unipolar intraventricular leads and that on the wall of the superior vena cava were recorded under control conditions, once the myocardial damage had been induced, during the ventricular tachycardia, and following the injection of inosine. Of the 63 inosine-treated animals; in 34, VT was due to aconitine; in 16, it was produced only by the myocardial damage and, in 13, VT was presented spontaneously.
  
  
  RESULTS
  Sinus rhythm was not reestablished in the animals of the control group. Inosine reestablished the sinus rhythm in 26 of 34 dogs (76%) that received phenol and aconitine, in 13 of the 16 (81%) presenting only the myocardial damage, and in 6 of the 13 (46%) with spontaneous ventricular tachycardia. In some experiments, inosine induced supraventricular tachycardias, ventricular-atrial blocks, and ventricular pre-excitation phenomena.
  
  
  CONCLUSIONS
  In this experimental series, inosine showed antiarrhythmic and arrhythmogenic effects, similar to those of adenosine from which it derives.
authors.affiliation: Instituto Nacional de Cardiología lgnacio Chávez, México.
authors.forename: Alfredo
authors.initials: A
authors.lastname: de Micheli
authors.forename: Gustavo
authors.initials: G
authors.lastname: Pastelín
authors.forename: Rafael
authors.initials: R
authors.lastname: Chávez Domínguez
authors.forename: Pedro
authors.initials: P
authors.lastname: Iturralde Torres
authors.forename: Gustavo A
authors.initials: GA
authors.lastname: Medrano
mesh_terms: D000818:Animals; D004285:Dogs; D007288:Inosine / Q000627:therapeutic use*; D017180:Tachycardia, Ventricular / Q000517:prevention & control*
chemical_list: D007288:Inosine