Inclusion/Exclusion criteria

Inclusion Criteria:

  • Patients 18 years and older
  • Patients with class I or IIa indication for ICD therapy according to the ACC/AHA/ESC 2006 Guidelines for Management of Patients With Ventricular Arrhythmias and the Prevention of Sudden Cardiac Death

Exclusion Criteria:

  • Patients with documented therapy refractory monomorphic ventricular tachycardia
  • Patients having an indication for pacing therapy
  • Patients with ventricular tachycardia less than 170 bpm
  • Patients failing appropriate QRS/T-wave sensing with the S-ICD ECG patient screening tool provided by Boston Scientific
  • Patients with incessant ventricular tachycardia
  • Patients with a serious known concomitant disease with a life expectancy of less than one year
  • Patients with circumstances that prevent follow-up (no permanent home or address, transient, etc.)
  • Patients who are unable to give informed consent
  • Patients who have had a previous ICD implant
  • Patient who receive cardiac contractility modulation therapy or are likely to receive cardiac contractility modulation therapy.