Real-time Automated Program for IDentification of VT Origin

Inclusion Criteria: * Patients will be eligible for inclusion if they fulfilled VANISH inclusion criteria by having both of: 1. Prior myocardial infarction (pathological Q waves or imaging evidence of regional myocardial akinesis/thinning in the absence of a non-ischemic cause)38 and 2. One of the following VT events within the last 6 months while on Amiodarone or another class III or class I antiarrhythmic drug: A: Sustained monomorphic VT documented on 12-lead ECG or rhythm strip requiring termination by pharmacologic means or DC cardioversion, B: ≥3 episodes of symptomatic VT treated with anti-tachycardia pacing (ATP), C: ≥1 appropriate ICD shocks, D: ≥3 VT episodes within 24 hours, separated by ≥ 5 minutes, E: sustained VT below detection rate of an ICD Exclusion Criteria: * Patients will be excluded from the trial if they: 1. Are unable or unwilling to provide informed consent. 2. Have active ischemia or another reversible cause of VT (e.g. drug-induced arrhythmia), or had recent acute coronary syndrome requiring revascularization. 3. Are antiarrhythmic drug-naïve. 4. Are known to have protruding left ventricular thrombus or mechanical aortic and mitral valves. 5. Have had a prior catheter ablation procedure for VT. 6. Are in renal failure (Creatinine clearance \<15 mL/min) 7. Have NYHA Functional class IV heart failure or CCS Functional class IV angina. 8. Have had recent ST elevation myocardial infarction (\< 1 month). 9. Are pregnant or have a systemic illness likely to limit survival to \<1 year.