Frequency, Duration, and Predictors of Newly-Diagnosed Atrial Fibrillation Following Dual-Chamber Pacemaker Implantation in Patients Without a Previous History of Atrial Fibrillation††Conflicts of interest: Dr. Mittal is a consultant for Biotronik and LifeWatch Corporation, Rosemont, Illinois; has received fellowship support from Boston Scientific Corporation, St. Paul, Minnesota, and Medtronic, Minneapolis, Minnesota; and has received speaking honoraria from Boston Scientific Corporation, Medtronic, and St. Jude Medical, St. Paul, Minnesota. Dr. Stein has received speaking honoraria from Boston Scientific Corporation, Medtronic, and St. Jude Medical and is a member of the advisory boards of Boston Scientific Corporation and Medtronic. Dr. Gilliam is a consultant for, has received speaking honoraria from, is a member of the advisory board of, and has received research funding from Boston Scientific Corporation. Stacia Merkel Kraus is a consultant for Boston Scientific Corporation. Drs. Meyer and Christman are employees of Boston Scientific Corporation.