Mean postoperative CK-MB level ( IU/L ) showed the following results : At 1h ( Group A 20.94 + 1.66 , Group B 20.57 + 1.54 , P = .35 ) , at 12h ( Group A 27.13 + 1.85 , Group B 28.05 + 3.04 , P = .135 ) , at 24h ( Group A 27.63 + 1.7 , Group B 27.85 + 2.2 , P = .63 ) , and at 48h ( Group A 22.95 + 2.76 , Group B 23.27 + 3.6 , P = .69 ) .