title: Diagnostic evaluation of creatine kinase-2 mass and creatine kinase-3 and -2 isoform ratios in early diagnosis of acute myocardial infarction.
abstract: The diagnostic efficacy of creatine kinase (CK) isoforms (CK-3 and CK-2) was compared with measurement of CK-2 mass concentrations for the early diagnosis of myocardial infarction (MI). Serial serum samples drawn from 76 patients with confirmed MI and 55 non-MI patients were used for determining CK-2 mass concentrations and the MM3/MM1 (CK-3 isoforms) and MB2/MB1 (CK-2 isoforms) ratios. We compared the diagnostic utility of each by receiver-operating-characteristic (ROC) curve and likelihood ratio analyses. Our results indicate that all three tests were ineffective within the first 4 h after the onset of chest pain. All three were most effective at 4-18 h after onset, but both CK-3 and CK-2 isoform ratios were less effective than CK-2 mass concentrations in the next 6-h period (18-24 h). In the critical time between 3 and 6 h, the diagnostic performance of all three was comparable.
authors.affiliation: Department of Clinical Biochemistry, University Hospital (University of Western Ontario), London, Canada.
authors.forename: V
authors.initials: V
authors.lastname: Bhayana
authors.forename: S
authors.initials: S
authors.lastname: Cohoe
authors.forename: F Y
authors.initials: FY
authors.lastname: Leung
authors.forename: G
authors.initials: G
authors.lastname: Jablonsky
authors.forename: A R
authors.initials: AR
authors.lastname: Henderson
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003402:Creatine Kinase / Q000097:blood*; D004587:Electrophoresis, Agar Gel; D005189:False Positive Reactions; D005260:Female; D006801:Humans; D007527:Isoenzymes; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000175:diagnosis / Q000201:enzymology*
chemical_list: D007527:Isoenzymes; D003402:Creatine Kinase