Although antiarrhythmic drugs remain the primary form of therapy for VT, non-pharmacologic techniques like implantable cardioverter-defibrillator (ICD) and catheter ablation (CA) are becoming increasingly popular because of advancement in technology as well as an increase in desire among patients to eliminate the arrhythmia with ablation rather than suppressing it with drugs. ICDs and CA effectively terminate VT on a short-term basis; but multiple morphologies, hemodynamic instability and non-inducibility limit the long-term success rate of CA. The 'substrate mapping' approach defines areas of ventricular scar which can be potential VT sources. Several studies on small groups of patients have shown that successful ablation of VT substrates either reduces the recurrence of VT to 19- 50% or reduces the frequency of recurrence as well as the requirement of anti-arrhythmic drugs (AADs).