title: Prevention of myocardial dysfunction by Eplerenon in experimental tachycardiomyopathy.
abstract: BACKGROUND
  High-rate short-duration ventricular pacing induces myocardial hypokinesis that persists once the hemodynamic conditions have been recovered. The aim was to study the factors that determine the persistence of myocardial dysfunction when ventricular tachycardia has ceased and hemodynamic conditions have been restored.
  
  
  METHODS
  An in vivo experimental pig model was used consisting of a ventricular pacing series (n=10), a ventricular pacing and aldosterone blockade (eplerenon) series (n=6), and a control series without ventricular pacing (n=6). Electrical stimulation was performed from the epicardial base of the left ventricle at a frequency 60% above the basal rate for 2 hours followed by a recovery period of 60 minutes. Cardiac and myocardial function parameters were studied. Plasma levels of aldosterone, renin activity, and glutathione were measured.
  
  
  RESULTS
  Electrically induced tachycardia produced hemodynamic and myocardial changes that persisted after stimulation had ceased, accompanied by an increase in aldosterone and a coronary flow decrease. These changes were not seen when aldosterone activity was blocked by eplerenon. There was a non-significant elevation in glutathione levels.
  
  
  CONCLUSIONS
  These data show that although participation of other neurohormones cannot be ruled out, aldosterone blockade (eplerenon) ameliorates myocardial dysfunction persisting after ventricular tachycardia by preventing coronary endothelial dysfunction.
authors.affiliation: Cardiocirculatory Unit, Research Center, Hospital La Fe, Valencia, Spain. hernandiz_amp@gva.es
authors.forename: Juan
authors.initials: J
authors.lastname: Cosín-Aguilar
authors.forename: Amparo
authors.initials: A
authors.lastname: Hernándiz-Martínez
authors.forename: Amparo
authors.initials: A
authors.lastname: Aguilar-Llopis
authors.forename: Manuel
authors.initials: M
authors.lastname: Portolés-Sanz
authors.forename: José Luis
authors.initials: JL
authors.lastname: Díez-Gil
mesh_terms: D000818:Animals; D009202:Cardiomyopathies / Q000503:physiopathology / Q000517:prevention & control*; D000077545:Eplerenone; D005260:Female; D008297:Male; D000451:Mineralocorticoid Receptor Antagonists / Q000627:therapeutic use*; D013148:Spironolactone / Q000031:analogs & derivatives* / Q000627:therapeutic use; D013552:Swine; D013610:Tachycardia / Q000503:physiopathology*
chemical_list: D000451:Mineralocorticoid Receptor Antagonists; D013148:Spironolactone; D000077545:Eplerenone