SAN FRANCISCO, California – Electrocardiogram (ECG) parameters and QRS durations (ventricular activity shown in an electrocardiogram) are not specific enough to either include or exclude patients to receive implantable cardioverter defibrillator (ICD) therapy, according to a new sub-study analysis of the Sudden Cardiac Death in Heart Failure Trial (SCD-HeFT) presented at the Heart Rhythm Society’s (HRS; Natick, Massachusetts) 25th annual scientific sessions.