Inclusion Criteria:

1. Any subject that had an ICD/CRT-D replacement/upgrade according to the latest relevant clinical guidelines with a MicroPort CRM ICD / CRT-D for less than 7 days
2. Signed and dated the informed consent form

Exclusion Criteria:

1. RV lead replacement
2. Previous ICD/CRT-D inactivated or already explanted
3. Active myocarditis
4. Primary prevention for Arrhythmogenic Ventricular Cardiomyopathy, Ion channelopathies, Hypertrophic Cardiomyopathy and Infiltrative or Inherited Cardiomyopathy.
5. Heart transplant (done or on waiting list) or implanted with a ventricular assist device (VAD)
6. Already included in an Interventional study that could confound the results of this study
7. Inability to understand the purpose of the study or to meet follow-up visits as defined in the investigational plan
8. Minor age (<18 years) or under guardianship or kept in detention
9. Ongoing drug or alcohol addiction or abuse which would interfere with the subject's ability to be compliant with the study.
10. Life expectancy less than 1 year
11. Pregnant or breast feeding