Iperia/Sentus QP Study

Inclusion Criteria: * Patient is able to understand the nature of the study and provides written informed consent. * Patient meets a standard indication for CRT-D (Sentus QP group) or ICD therapy. * Patient is able and willing to complete the planned follow-up visits at the investigational site. * Patient accepts the Home Monitoring® concept. * Age is ≥ 18 years. * Sentus QP group only: Patient is a candidate for a new (de novo) implant or an upgrade from an existing ICD or pacemaker utilizing a BIOTRONIK Sentus QP lead Exclusion Criteria: * Patient has a standard contraindication for CRT-D (Sentus QP group) or ICD therapy. * Sentus QP group only: Currently implanted with an endocardial or epicardial LV lead or had prior attempt to place a LV lead. * Sentus QP group only: Cardiac surgery procedure (coronary bypass graft, valve surgery, or ablation) that is planned to occur within 3 months after implantation. * Patient is expected to receive ventricular assist device or heart transplantation within the next 3 months. * Patient is pregnant or breastfeeding. * Life expectancy of less than 3 months * Participating in another cardiac clinical investigation with active treatment arm.