BIO|CONCEPT.CorSky, First in Human Study for the CorSky ICD Family

Inclusion Criteria: * Standard indication for ICD or CRT-D therapy according to clinical guidelines * Planned for de novo implantation of an ICD/CRT-D, or upgrade/exchange from existing ICD/CRT-D or pacemaker implant * Ability to understand the nature of the study * Willingness to provide written informed consent * Ability and willingness to perform all on-site follow-up visits at the study site Ability and willingness to use the CardioMessenger and acceptance of the BIOTRONIK Home Monitoring concept Exclusion Criteria: * For VR-T DX and CRT-DX: Permanent atrial tachyarrhythmia * For VR-T DX and CRT-DX: Patients requiring atrial pacing * Planned for His-Bundle-Pacing * Planned cardiac surgical procedures or interventional measures other than the study procedure within the next 12 months * Pregnant or breast feeding * Age less than 18 years * Participation in another interventional clinical investigation according to the definition given below 2,3 * Life-expectancy less than 12 months