1. A method of treating arrhythmogenic cardiac tissue, comprising: recording a base cardiac electrogram signal at a base electrode for a predetermined amount of time; recording a plurality of cardiac electrogram signals at a plurality of electrodes other than the base electrode for the predetermined amount of time; comparing the base cardiac electrogram signal with each of the plurality of cardiac electrogram signals; determining an average correlation coefficient associated with the base cardiac electrogram signal and each of the plurality of cardiac electrogram signals; mapping a specific area of cardiac tissue where the base electrode is positioned based at least in part on the determined average correlation coefficient; analyzing the average correlation coefficient to determine whether the average correlation coefficient has a low value; identifying the specific area of cardiac tissue as arrhythmogenic cardiac tissue when the average correlation coefficient has a low value; providing a medical device including an ablation element; identifying a closed boundary between the arrhythmogenic cardiac tissue and surrounding cardiac tissue based at least in part on the average correlation coefficient; placing the medical device in contact with the arrhythmogenic cardiac tissue; and activating the ablation element and ablating substantially all of the arrhythmogenic cardiac tissue within the boundary.