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Clinical Chemistry, Vol 42, 1770-1776, Copyright © 1996 by American Association for Clinical Chemistry
AS Jaffe, Y Landt, CA Parvin, DR Abendschein, EM Geltman and JH Ladenson
Cardiovascular Division, Washington University, School of Medicine, St. Louis, MO, USA. jaffea@vax.cs.hscsyr.edu
Criteria for the retrospective diagnosis of acute myocardial infarction rely heavily on increases in lactate dehydrogenase (LD) isoenzymes. However, increases of LD isoenzyme activities are not specific for myocardial injury. Recently, increased concentrations of cardiac troponin I (cTnI) have been shown to be highly specific for myocardial damage and to have sensitivity comparable with that of creatine kinase MB isoenzyme for detecting cardiac injury. Furthermore, increases of cTnI persist in plasma for at least several days. The present study was designed to determine the relative sensitivities of cTnI and LD isoenzymes over time for the diagnosis of infarction. The results indicate that cTnI values are at least as sensitive as LD isoenzymes: 90% of patients with myocardial infarction had above-normal concentrations of cTnI on the 4th day after admission to the coronary care unit. Criteria based on cTnI should improve the accuracy of retrospective diagnoses of acute myocardial infarction.
The following articles in journals at HighWire Press have cited this article:
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