Changes in QRS Area and QRS Duration After Cardiac Resynchronization Therapy Predict Cardiac Mortality, Heart Failure Hospitalizations, and Ventricular Arrhythmias

Background Predicting clinical outcomes after cardiac resynchronization therapy ( CRT ) and its optimization remain a challenge. We sought to determine whether pre‐ and postimplantation QRS area ( QRS area ) predict clinical outcomes after CRT . Methods and Results In this retrospective study, QRS area , derived from pre‐ and postimplantation vectorcardiography, were assessed in relation to the primary end point of cardiac mortality after CRT...