title: Correlation between QRS Duration, Pulmonary Insufficiency and Right Ventricle Performance in Totally Corrected Tetralogy of Fallot.
abstract: OBJECTIVE
  Despite progresses in surgical correction of Tetralogy of Fallot, pulmonary insufficiency and progressive dysfunction of the right ventricle impress its long-term prognosis. In this study we examined the correlations between QRS duration, pulmonary insufficiency and right ventricular performance index.
  
  
  METHODS
  We enrolled 57 repaired Tetralogy of Fallot patients. QRS duration on electrocardiogram, pulmonary regurgitation index (regurgitation time to diastolic time ratio), and right ventricular myocardial performance index were measured.
  
  
  RESULTS
  There was a strong inverse correlation between QRS duration and pulmonary regurgitation index. However, significant correlation did not exist between QRS duration and right ventricular myocardial performance index. QRS duration ≥160 ms predicted severe pulmonary regurgitation with 100% sensitivity and 87% specificity.
  
  
  CONCLUSIONS
  Increased QRS duration can predict severity of pulmonary regurgitation.
authors.affiliation: Department of Pediatric, Hamedan University of Medical Sciences, Hamedan, Iran.
authors.forename: Asadolah
authors.initials: A
authors.lastname: Tanasan
authors.affiliation: Department of Pediatrics, Tehran University of Medical Sciences, Tehran, Iran ; Pediatric Cardiology Division, Children's Medical Center, Pediatrics Center of Excellence, Tehran, Iran.
authors.forename: Armen
authors.initials: A
authors.lastname: Kocharian
authors.affiliation: Department of Pediatrics, Tehran University of Medical Sciences, Tehran, Iran ; Pediatric Cardiology Division, Children's Medical Center, Pediatrics Center of Excellence, Tehran, Iran.
authors.forename: Keyhan Sayadpour
authors.initials: KS
authors.lastname: Zanjani
authors.affiliation: Department of Pediatrics, Islamic Azad University Kazeroon Branch, Kazeroon, Iran.
authors.forename: Farah K
authors.initials: FK
authors.lastname: Payravian
authors.affiliation: Department of Epidemiology, Hamedan University of Medical Sciences, Hamedan, Iran.
authors.forename: Sadat
authors.initials: S
authors.lastname: Torabian
keywords: ECG; Pulmonary Insufficiency; Pulmonary Regurgitation; QRS Complex; Tetralogy of Fallot; Ventricular Performance