CyberHeart's Cardiac Arrhythmia Ablation Treatment: Patients With Refractory Ventricular Tachycardia/Fibrillation

Inclusion Criteria: * Presence of an implantable cardioverter-defibrillator (ICD) * Patients with ischemic or non-ischemic cardiomyopathy who have had recurrent symptomatic VT that induced ICD shock(s) following catheter ablation and/or antiarrhythmic drug (AAD) therapy. * 60 years of age or greater. * Left ventricular ejection fraction ≥ 20%. * Failure of or ineligible for catheter ablation. Exclusion Criteria: * Unable or unwilling to provide informed consent * Patients with idiopathic VT * Women who are pregnant * Prior radiation therapy to the thorax * Active ischemia or other reversible causes of VT * Active non-cardiovascular illness or systemic infection * Presence of thrombus in the right atrium or right ventricle on pre-procedure echocardiogram * Cardiogenic shock * NYHA (New York Heart Association) Class IV Heart Failure. * Presence of incessant VT that is hemodynamically unstable. * Acute heart failure exacerbation. * Revascularization in the past 90 days. * Other disease process that is likely to limit survival to less than 12 months