High Intensity His Bundle Pacing in Heart Failure Patients With Narrow QRS Outcome Study

All patients will be implanted with an Implantable cardioverter defibrillator (ICD) and an ICD lead in the right ventricle (either RV apex or RV septum). In all patients a pacing lead will be positioned in the right atrium (typically the right atrial appendage). All patients will have a pacemaker lead positioned on the His bundle to obtain direct His-bundle capture.