This study evaluates the date of the first appropriate and/or inappropriate therapy in patients implanted with a Guidant PRIZM or VITALITY defibrillator and is evaluating eventual predictive risk factors for appropriate/inappropriate therapies as well as the influence of the programmed parameters on these therapies.

The registry measured the times to, and studied the determinants of, first appropriate (FAT) and inappropriate (FIT) therapy delivered by single, dual and triple chamber (CRT-D) ICD implanted for primary and secondary prevention indications.

Inclusion Criteria:

• Indication for an ICD according to current guidelines, incl. prophylactic indication

Exclusion Criteria:

• pregnant or at birth bearing age without contraception, participation in another clinical trial, short life expectancy, geographically unstable for a follow-up at the investigational center

All patients with a conventional indication of ICD or CRT-D