Postoperatively at 0 , 6 , and 12 hours , there were no differences in CK-MB ( U/l ) ( 37.5 57.9 v 32.0 21.5 , 29.4 41.1 v 24.4 23.1 , and 21.4 21.3 v. 21.8 32.4 , respectively ) and troponin T ( 752.4 638.2 v 762.7 557.1 , 753.8 507.3 v 777.6 515.0 , and 774.6 572.6 v 698.7 540.2 , respectively ) values .