Implanted within the last 30 days or candidate for implantation of a BIOTRONIK ICD or CRT-D DF4 compatible system along with the Protego DF4 lead

Meets ICD or CRT-D system implant recommendations as defined in guidelines published by relevant professional societies

Able to understand the nature of the registry and provide informed consent

Available for follow-up visits on a regular basis at the investigational site for the expected 5 years of follow-up

Age greater than or equal to 18 years

Protego DF4 Post Approval Registry