Nicholas D Skadsberg1, Rangadham Nagarakanti2, Sanjeev Saksena3,4. 1. Therapy, Delivery, Cardiac Rhythm Disease Management, Medtronic, Inc., Minneapolis, Minnesota. 2. Lankenau Institute for Medical Research, Wynnewood, Pennsylvania. 3. Electrophysiology Research Foundation, Warren, New Jersey. 4. Department of Medicine Robert Wood Johnson Medical School, New Brunswick, New Jersey.