6. Cardiac arrest (patients with history of cardiac arrest within 12 months unless precipitated by an event such as an acute myocardial infarction, induction by catheter placement, severe transient electrolyte abnormality, by an electrophysiology procedure, or addressed by Automatic Implantable Cardioverter Defibrillator placement. Patients with increased risk of cardiac arrest, QTc > 450 msec, atrial ventricular block II or III, etc.)