No difference was shown between the two groups in CK-MB levels before PCI [ ( 12.9 5.1 ) U/L vs ( 12.0 5.2 ) U/L , P > 0.05 ] ; and the increase of CK-MB 12-24 hours after PCI [ ( 1.0 6.2 ) U/L vs ( 2.3 8.3 ) U/L , P > 0.05 ] .