Pilot Study of Catheter Ablation for Ventricular Tachycardia in Patients With an Implantable Cardioverter Defibrillator

Inclusion Criteria: * Have an ICD with or without cardiac resynchronization therapy (i.e. CRT-D) for a primary or secondary prevention indication * Have ischemic heart disease defined as the presence of wall motion abnormalities and documented coronary artery disease (one ≥ 70% stenosis in ≥ 1 major coronary artery) * Have ≥ 1 documented ICD shock or ≥ 3 ATP therapies within 6 months before randomization for VT in the absence of a reversible cause that in the opinion of the treating physician requires further therapy. The VT has to be monomorphic and at a rate of ≤ 260 bpm. * Be at least 18 years of age * Be eligible for catheter ablation * Have no history of intolerance or contraindication to at least 1 of the following antiarrhythmic medications: amiodarone, sotalol, and mexiletine. Exclusion: * Patients who in the opinion of the treating physician should not receive additional therapy * More than 30 days of amiodarone treatment in the past 3 months unless the patient has been on ≤ 200 mgs of amiodarone daily for atrial arrhythmias or premature ventricular contractions (PVCs) and the patient is eligible for a higher dose of amiodarone * Incessant VT that necessitates immediate treatment * Reversible causes of VT including but not limited to ischemia, decompensated HF, and electrolyte disturbances * The presence of a contraindication to catheter ablation of VT (including the presence of a mobile ventricular thrombus; an acute MI, coronary revascularization, or a stroke in the preceding 30 days; unstable angina or NYHA class IV HF; a mechanical valve; or inability to receive anticoagulation or antithrombotic therapy) * Patients with non-ischemic cardiomyopathy * Patients with hypertrophic obstructive, restrictive, or infiltrative cardiomyopathy * Patients with acute myocarditis, congenital heart disease, valvular disease likely to require surgery in the next 1 year, and/or inoperable obstructive valvular disease * Patients with a heart transplant or who are expected to undergo cardiac transplantation within 12 months * Patients with a left ventricular assist device * Patients who are already on antiarrhythmic drug therapy (other than beta-blockers) for VT (patients will not be excluded if they are receiving antiarrhythmic drug therapy for atrial arrhythmias or PVCs if they are eligible for additional drug therapy for VT). * Heritable arrhythmias or increased risk for torsade de pointes with class III drugs * End stage renal disease requiring dialysis * Estimated life expectancy of \<1 year from a non-cardiac cause * Women who are pregnant or who have childbearing potential and are not using a reliable method of contraception * Inability to give informed consent