SAN RAMON, Calif.--(BUSINESS WIRE)--ESTECH announced today compelling data supporting the use of its AFfirm device as reported by researchers at the recent American Association for Thoracic Surgery (AATS) and Surgical Treatment of Atrial Fibrillation (STAF) meetings, May 5-9, in Washington, DC, demonstrating “Conduction Block” is a marker for successful treatment of Atrial Fibrillation (AF).