Defibrillation Testing in Patients Undergoing Replacement of the S‐ICD Generator: Is There Still a Need?

General omittance of DFT in S-ICD generator replacement is not advisable. New algorithms for low impedance DFT measurements during S-ICD query and PREATORIAN score at first implantation can be used to predict conversion failure. An impedance <70 Ohm and a PRAETORIAN score < 90 show a very low risk of conversion failure. In patients with a PRAETORIAN score > 150 DFT testing should be performed when the S-ICD generator is replaced until randomized data is available.