There were 39 thromboembolic events ( 3.7 % strokes [ n = 29 ] and 1.3 % transient ischemic attacks [ n = 10 ] ) in group 1 : two events ( 0.87 % ) in patients with paroxysmal AF , 4 ( 2.3 % ) in patients with persistent AF , and 33 ( 8.5 % ) in patients with long-standing persistent AF .