 It is well known that human hearts display a variable amount of fat overlying the epicardium. Not only is the coronary vasculature embedded in a layer of adipose tissue, but the rest of the heart may have areas of epicardial fat. As fat is an insulator and does not generate or easily conduct electrical activity, current mapping techniques may classify epicardial fat incorrectly as myocardial scar. This may have important effects on the ability to diagnose and treat arrhythmias with epicardial ablation. 