124: TIMED RESUMPTION OF BETA-BLOCKERS AND THE INCIDENCE OF ATRIAL FIBRILLATION AFTER NONCARDIAC SURGERY. Issue 12 (December 2016) - Khanna, Ashish; Sessler, Daniel; Diwan, Murtaza; You, Jing; Naylor, Amanda; Reville, Eric; Riter, Quinton; Naylor, Douglas