Sen O, et al. - Among patients (n=228) with left ventricular ejection fraction ≤35% who underwent implantable cardioverter defibrillator (ICD) implantation for primary prevention, researchers evaluated T-wave peak to T-wave end interval (Tp-e) as a predictor of appropriate ICD shocks and all-cause death. The participants were followed-up prospectively. Appropriate ICD therapy because of ventricular tachycardia (VT)/ventricular fibrillation (VF), death, and a combined end point of VT/VF or mortality were considered as end points. Of 228 patients, 112 (49.1%) had appropriate ICD shocks, as revealed during a mean observation period of 22.3 ± 7.7 months. In patients with systolic dysfunction and ICDs implanted for primary prophylaxis, appropriate ICD shocks were independently predicted by Tp-e interval.