Mean postoperative CK-MB level ( IU/L ) showed the following results : At @h ( Group A @ + @ , Group B @ + @ , P = @ ) , at @h ( Group A @ + @ , Group B @ + @ , P = @ ) , at @h ( Group A @ + @ , Group B @ + @ , P = @ ) , and at @h ( Group A @ + @ , Group B @ + @ , P = @ ) .