Abstract 2682: Efficacy of Combined Use of T-Wave Alternans and Late Potentials in Predicting Lethal Ventricular Tachyarrhythmia Among Patients With Left Ventricular Dysfunction: Insight From the PREVENT-SCD (Prospective Evaluation of Ventricular Tachyarrhythmic Events and Sudden Cardiac Death in Patients With Left Ventricular Dysfunction) Study