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Clinical Chemistry 46: 338-344, 2000;
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(Clinical Chemistry. 2000;46:338-344.)
© 2000 American Association for Clinical Chemistry, Inc.

Articles

Correlation of Antemortem Serum Creatine Kinase, Creatine Kinase-MB, Troponin I, and Troponin T with Cardiac Pathology

Daylily S. Ooia, Phillip A. Isotalo and John P. Veinot

a Address correspondence to this author at: Division of Biochemistry, Department of Pathology and Laboratory Medicine, Ottawa Hospital-Civic Campus, 1053 Carling Ave., Ottawa, ON K1Y 4E9 Canada. Fax 613-761-5401; e-mail dsooi{at}ottawahospital.on.ca

Background: Spurious increases in serum troponins, especially troponin T, have been reported in patients with and without acute myocardial syndromes.

Methods: We studied 78 autopsied patients without clinical myocardial infarction (MI) and correlated histologic cardiac findings with antemortem serum creatine kinase (CK), its MB isoenzyme (CK-MB), cardiac troponin I (cTnI), and cardiac troponin T (cTnT).

Results: There was no significant myocardial pathology in 15 patients. Cardiac pathologies were in five groups: scarring from previous MI or patchy ventricular fibrosis (n = 9), recent MI (n = 27), healing MI (n = 7), degenerative myocyte changes consistent with congestive heart failure (CHF; n = 12), and other cardiac pathologies (n = 8). The median concentrations in the five groups were not significantly different for either CK or CK-MB. Compared with the no-pathology group, only the MI group was significantly different for cTnI, and the MI and other pathology groups were significantly different for cTnT. For patients with MI, 22%, 19%, 48%, and 65% had increased CK, CK-MB, cTnI, and cTnT, respectively; for CHF and other cardiac pathologies combined, the percentages were 28%, 17%, 22%, and 50%. For patients with increased cTnI, 72% and 28% had MI and other myocardial pathologies, respectively; patients with increased cTnT had 64% and 36%, respectively. Patients without myocardial pathology had no increases in CK-MB, cTnI, or cTnT.

Conclusions: All patients with increased serum CK-MB, cTnI, and cTnT had significant cardiac histologic changes. The second-generation cTnT assay appears to be a more sensitive indicator of MI and other myocardial pathologies than the cTnI assay used in this study.




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