TD01 Master Study (Safety and Efficacy Study)

Inclusion Criteria: * Meet standard indication for ICD/CRT-D therapy * First ICD/CRT-D implantation or upgrade from pacemaker * Duly signed informed consent form * Willing to participate for the whole study duration * Patient accepts Home Monitoring concept and is able to activate and use the CardioMessenger * Patient has a legal capacity and ability to consent Exclusion Criteria: * Meet a standard contraindication for an ICD/CRT-D therapy * Age \< 18 years * Pregnant or breast-feeding * Cardiac surgery planned within the next six months * Enrollment in another cardiac clinical investigation with active treatment arm * Mechanical tricuspid valve prosthesis or severe tricuspid valve disease * Known dexamethasone acetate intolerance