METHODS	Serial samples for measurement of creatine kinase ( CK-MB ) , cardiac troponin I ( cTnI ) , ischemia-modified albumin ( IMA ) and heart-type fatty-acid-binding protein ( hFABP ) were taken at baseline , prebypass , T = 10 minutes , 2 , 6 , 12 , and 24 hours after cross-clamp release , to assess the degree of myocardial damage .\