title: Tpeak-to-Tend interval corrected for heart rate: A more precise measure of increased sudden death risk?
abstract: The Tpeak to Tend (Tpe) interval on the 12-lead electrocardiogram predicts an increased risk of sudden cardiac arrest (SCA). There is controversy over whether Tpe would be more useful if corrected for heart rate (Tpec).
  
  
  
  We evaluated whether the predictive value of Tpe for SCA improves with heart rate correction and sought to determine an optimal cutoff value for Tpec in the context of SCA risk.
  
  
  
  Cases of SCA (n = 628; mean age 66.4 ± 14.5 years; n = 416, 66.2% men) from the Oregon Sudden Unexpected Death Study with an archived electrocardiogram available prior and unrelated to the SCA event were analyzed. Comparisons were made with control subjects (n = 819; mean age 66.7 ± 11.5 years; n = 559, 68.2% men). The Tpe interval was corrected for heart rate using Bazett (TpecBa) and Fridericia (TpecFd) formulas, and the predictive value of Tpec for SCA was evaluated using logistic regression models.
  
  
  
  The area under the curve for Tpec predicting SCA improved with both correction formulas. TpecBa and TpecFd were shown to have an area under the curve of 0.695 and 0.672, respectively, as compared with a baseline of 0.601 with an uncorrected Tpe. A TpecBa value of >90 ms was predictive of SCA, independent of age, sex, comorbidities, QRS duration, corrected QT interval, and severely reduced left ventricular ejection fraction (≤35%; odds ratio 2.8; 95% confidence interval 1.92-4.17; P < .0001).
  
  
  
  Correcting Tpe for heart rate, using either the Bazett or the Fridericia formula, improved the independent predictive value of this marker for the assessment of SCA risk. Prolongation of TpecBa beyond 90 ms was associated with a nearly 3-fold increased risk of SCA.
authors: Heart Institute, Cedars-Sinai Medical Center, Los Angeles, California; Department of Cardiology, National Heart Centre Singapore, Singapore.
authors: Kelvin C M
authors: KC
authors: Chua
authors: Heart Institute, Cedars-Sinai Medical Center, Los Angeles, California.
authors: Carmen
authors: C
authors: Rusinaru
authors: Heart Institute, Cedars-Sinai Medical Center, Los Angeles, California.
authors: Kyndaron
authors: K
authors: Reinier
authors: Heart Institute, Cedars-Sinai Medical Center, Los Angeles, California.
authors: Audrey
authors: A
authors: Uy-Evanado
authors: Heart Institute, Cedars-Sinai Medical Center, Los Angeles, California.
authors: Harpriya
authors: H
authors: Chugh
authors: Department of Pathology.
authors: Karen
authors: K
authors: Gunson
authors: Department of Emergency Medicine, Oregon Health and Science University, Portland, Oregon.
authors: Jonathan
authors: J
authors: Jui
authors: Heart Institute, Cedars-Sinai Medical Center, Los Angeles, California. Electronic address: Sumeet.Chugh@cshs.org.
authors: Sumeet S
authors: SS
authors: Chugh
mesh_terms: D000368:Aged; D016757:Death, Sudden, Cardiac / Q000453:epidemiology / Q000517:prevention & control; D061827:Dimensional Measurement Accuracy; D004562:Electrocardiography / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009922:Oregon / Q000453:epidemiology; D011237:Predictive Value of Tests; D011379:Prognosis; D018570:Risk Assessment / Q000379:methods*
keywords: Cardiac arrest; Death; Prediction; Prevention; Risk; Stratification; sudden cardiac