title: Effects of echinochrome on ventricular repolarization in acute ischemia.
abstract: BACKGROUND
  Myocardial ischemic electrophysiological alterations are associated with the generation of reactive oxygen species. However, electrophysiological effects of antioxidants are unclear. Our objective was to determine the effects of the antioxidant echinochrome on ventricular repolarization in a feline model of 30-min ischemia.
  
  
  RESULTS
  Activation-recovery intervals were measured from 64 ventricular electrograms recorded before and during the LAD ligation in untreated animals (controls, n=5) and animals given echinochrome (1mg/kg, n=5 and 2mg/kg, n=7). In controls, ischemia resulted in the increase of repolarization dispersion, QTc and Tpeak-Tend intervals and precordial T wave amplitude dispersion. Echinochrome attenuated the ischemic increase of repolarization dispersion. The increased dose of echinochrome abolished the ischemic ECG repolarization changes but did not modify the incidence of ventricular arrhythmias.
  
  
  CONCLUSIONS
  Echinochrome modified ischemic alterations of repolarization dispersion that were associated with the changes of the body surface T wave amplitude dispersion and Tpeak-Tend interval.
authors.affiliation: Laboratory of Cardiac Physiology, Institute of Physiology, Komi Science Centre, Ural Branch, Russian Academy of Sciences, 50, Pervomayskaya St, Syktyvkar, Russian Federation; Department of Biomedical Technology, Czech Technical University in Prague, Nam Sitna 3105, Kladno, Czech Republic. Electronic address: sedova.ks@gmail.com.
authors.forename: Ksenia
authors.initials: K
authors.lastname: Sedova
authors.affiliation: Laboratory of Cardiac Physiology, Institute of Physiology, Komi Science Centre, Ural Branch, Russian Academy of Sciences, 50, Pervomayskaya St, Syktyvkar, Russian Federation.
authors.forename: Olesya
authors.initials: O
authors.lastname: Bernikova
authors.affiliation: Laboratory of Cardiac Physiology, Institute of Physiology, Komi Science Centre, Ural Branch, Russian Academy of Sciences, 50, Pervomayskaya St, Syktyvkar, Russian Federation; Department of Physiology, Medical Institute of Syktyvkar State University, 11, Babushkin St, Syktyvkar, Russian Federation; Department of Physiology, Komi Branch of Kirov State Medical Academy, 11, Babushkin St, Syktyvkar, Russian Federation.
authors.forename: Jan
authors.initials: J
authors.lastname: Azarov
authors.affiliation: Laboratory of Cardiac Physiology, Institute of Physiology, Komi Science Centre, Ural Branch, Russian Academy of Sciences, 50, Pervomayskaya St, Syktyvkar, Russian Federation.
authors.forename: Dmitry
authors.initials: D
authors.lastname: Shmakov
authors.affiliation: Laboratory of Cardiac Physiology, Institute of Physiology, Komi Science Centre, Ural Branch, Russian Academy of Sciences, 50, Pervomayskaya St, Syktyvkar, Russian Federation.
authors.forename: Vladimir
authors.initials: V
authors.lastname: Vityazev
authors.affiliation: Laboratory of Cardiac Physiology, Institute of Physiology, Komi Science Centre, Ural Branch, Russian Academy of Sciences, 50, Pervomayskaya St, Syktyvkar, Russian Federation; Department of Physiology, Medical Institute of Syktyvkar State University, 11, Babushkin St, Syktyvkar, Russian Federation.
authors.forename: Sergey
authors.initials: S
authors.lastname: Kharin
mesh_terms: D000200:Action Potentials / Q000187:drug effects; D000818:Animals; D002415:Cats; D004195:Disease Models, Animal; D004562:Electrocardiography; D006329:Heart Conduction System / Q000187:drug effects*; D006352:Heart Ventricles / Q000187:drug effects*; D017202:Myocardial Ischemia / Q000188:drug therapy*; D009285:Naphthoquinones / Q000494:pharmacology*
chemical_list: D009285:Naphthoquinones; C007573:echinochrome A
keywords: Animal model; Antioxidant; Ischemia; Repolarization