RESULTS	Graft patency was similar between groups among 622 grafts assessed by angiography before hospital discharge ( 99 % OPCAB versus 97.7 % CPB ; p = 0.22 , Fisher 's exact test ) , among 511 grafts assessed by angiography at 1 year ( 93.6 % OPCAB versus 95.8 % CPB ; p = 0.33 ) , and among 190 grafts assessed by computed tomographic angiography at late follow-up ( 76 % OPCAB versus 83.5 % CPB ; p = 0.44 ) .\