The class two indications for ICD implantation are:
  1. Cardiac arrest presumed to be due to VF when electrophysiological testing is precluded by other medical conditions.
  2. Severe symptoms attributable to sustained ventricular arrhythmias while awaiting cardiac transplantation.
  3. Familial or inherited conditions with a high risk for lifethreatening ventricular tachyarrhythmia such as long QT syndrome or hypertrophic cardiomyopathy.
  4. Non-sustained VT with coronary artery disease, prior MI, and LV dysfunction, and inducible sustained VT or VF at electrophysiological study.
  5. Recurrent syncope of undetermined aetiology in the presence of ventricular dysfunction and inducible ventricular arrhythmias at electrophysiological study when other causes of syncope have been excluded.

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