WEST CHESTER, Ohio--(BUSINESS WIRE)--AtriCure, Inc. (Nasdaq: ATRC), a medical device company and a leader in cardiac surgical ablation systems, today announced that it has received conditional approval from the FDA to evaluate the safety and efficacy of a dual epicardial/ endocardial procedure (DEEP), or hybrid procedure, to treat patients with persistent and long-standing persistent atrial fibrillation (AF). The trial will be conducted at five prominent U.S. medical centers and provides for the enrollment of thirty patients. Initial enrollment is expected to begin during the second half of 2010.