title: Relationships between the T-peak to T-end interval, ventricular tachyarrhythmia, and death in left ventricular systolic dysfunction.
abstract: OBJECTIVE
  The interval between the T-wave's peak and end (Tpe), an electrocardiographic (ECG) index of ventricular repolarization, has been proposed as an indicator of arrhythmic risk. We aimed to clarify the clinical usefulness of Tpe for risk stratification.
  
  
  RESULTS
  We evaluated 327 patients with left ventricular ejection fraction (LVEF) ≤ 35% (75% male, LVEF 23 ± 7%). All patients had an implanted implantable cardioverter-defibrillator (ICD). Clinical data and ECGs were analysed at baseline. Prospective follow-up for the endpoints of appropriate ICD therapy and mortality was conducted via periodic device interrogation, chart review, and the Social Security Death Index. During device clinic follow-up of 17 ± 12 months, 59 (18%) patients had appropriate ICD therapy, and during mortality follow-up of 30 ± 13 months, 67 (21%) patients died. A longer Tpe(c) predicted appropriate ICD therapy, death, and the combination of appropriate ICD therapy or death (P< 0.01 for each endpoint). On multivariable analysis correcting for other univariable predictors, Tpe(c) remained predictive of ICD therapy [hazard ratio (HR) per 10 ms increase: 1.16, P= 0.02], all-cause mortality (HR per 10 ms: 1.14, P= 0.03), and the composite endpoint of ICD therapy or death (HR per 10 ms: 1.16, P< 0.01).
  
  
  CONCLUSIONS
  In patients with left ventricular systolic dysfunction and an implanted ICD, Tpe(c) independently predicts both ventricular tachyarrhythmia and overall mortality.
authors.affiliation: Ochsner Medical Center, 1514 Jefferson Highway, New Orleans, LA 70121, USA. dmorin@ochsner.org
authors.forename: Daniel P
authors.initials: DP
authors.lastname: Morin
authors.forename: Marc N
authors.initials: MN
authors.lastname: Saad
authors.forename: Omar F
authors.initials: OF
authors.lastname: Shams
authors.forename: J Sam
authors.initials: JS
authors.lastname: Owen
authors.forename: Joel Q
authors.initials: JQ
authors.lastname: Xue
authors.forename: Freddy M
authors.initials: FM
authors.lastname: Abi-Samra
authors.forename: Sammy
authors.initials: S
authors.lastname: Khatib
authors.forename: Onajefe S
authors.initials: OS
authors.lastname: Nelson-Twakor
authors.forename: Richard V
authors.initials: RV
authors.lastname: Milani
mesh_terms: D000368:Aged; D016757:Death, Sudden, Cardiac / Q000209:etiology; D017147:Defibrillators, Implantable; D004562:Electrocardiography; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D018570:Risk Assessment / Q000379:methods; D016019:Survival Analysis; D017180:Tachycardia, Ventricular / Q000209:etiology / Q000503:physiopathology*; D018487:Ventricular Dysfunction, Left / Q000150:complications / Q000401:mortality / Q000503:physiopathology*