 The realization that ventricular tachycardia VT in the setting of Chagas Disease can originate in the epicardium has lead to the development of a percutaneous, transthoracic epicardial approach to mapping and ablation of this arrhythmia. This approach has now been applied to patients with VT in the setting of ischemic and nonischemic heart disease at many centers throughout the world. Traditional mapping technologies are utilized on the epicardium to define scarred heart tissue and locate the VT circuit. 