The objective of this study is to confirm the safety and efficacy of the new Sentus OTW QP LV lead and Iperia ICD family. The study focuses on the safety and efficacy of the QP device system.

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.

The patient collective consists mainly of heart failure patients with CRT-D indication according to current guidelines. In addition 50 patients with an indication for single or dual chamber ICD will be enrolled in the study. The investigator will select patients who are appropriate for particiation from his general patient population.