SD01 Master Study (Safety and Efficacy Study)

Inclusion Criteria: * Standard indication for an ICD/CRT-D therapy * Signed informed consent form * Patient is willing and able to participate for the whole study duration * Patient is willing and able to activate and use the CardioMessenger * Legal capacity and ability to consent. Exclusion Criteria: * Standard contraindication for an ICD/CRT-D therapy * Age \<18 years. * Pregnant or breastfeeding * Cardiac surgery is planned within the next six months * Any condition that in the opinion of the investigator would preclude compliance with the study protocol during the whole follow-up period * Enrollment in another cardiac clinical investigation with active treatment arm * Mechanical tricuspid valve prosthesis or severe tricuspid valve disease * Dexamethasone acetate intolerance