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Original Article
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Volume 343:1139-1147 October 19, 2000 Number 16
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Markers of Myocardial Damage and Inflammation in Relation to Long-Term Mortality in Unstable Coronary Artery Disease
Bertil Lindahl, M.D., Ph.D., Henrik Toss, M.D., Agneta Siegbahn, M.D., Ph.D., Per Venge, M.D., Ph.D., Lars Wallentin, M.D., Ph.D., for The FRISC Study Group

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ABSTRACT

Background In patients with unstable coronary artery disease, there is a relation between the short-term risk of death and blood levels of troponin T (a marker of myocardial damage) and C-reactive protein and fibrinogen (markers of inflammation). Using information obtained during an extension of the follow-up period in the Fragmin during Instability in Coronary Artery Disease trial, we evaluated the usefulness of troponin T, C-reactive protein, and fibrinogen levels and other indicators of risk as predictors of the long-term risk of death from cardiac causes.

Methods Levels of C-reactive protein and fibrinogen at enrollment and the maximal level of troponin T during the first 24 hours after enrollment were analyzed in 917 patients included in a clinical trial of low-molecular-weight heparin in unstable coronary artery disease. The patients were followed for a mean of 37.0 months (range, 1.6 to 50.6).

Results During follow-up, 1.2 percent of the 173 patients with maximal blood troponin T levels of less than 0.06 µg per liter died of cardiac causes, as compared with 8.7 percent of the 367 patients with levels of 0.06 to 0.59 µg per liter and 15.4 percent of the 377 patients with levels of at least 0.60 µg per liter (P= 0.007 and P=0.001, respectively). The rates of death from cardiac causes were 5.7 percent among the 314 patients with blood C-reactive protein levels of less than 2 mg per liter, 7.8 percent among the 294 with levels of 2 to 10 mg per liter, and 16.5 percent among the 309 with levels of more than 10 mg per liter (P= 0.29 and P=0.001, respectively). The rates of death from cardiac causes were 5.4 percent among the 314 patients with blood fibrinogen levels of less than 3.4 g per liter, 12.0 percent among the 300 with levels of 3.4 to 3.9 g per liter, and 12.9 percent among the 303 with levels of at least 4.0 g per liter (P=0.004 and P=0.69, respectively). In a multivariate analysis, levels of troponin T and C-reactive protein were independent predictors of the risk of death from cardiac causes.

Conclusions In unstable coronary artery disease, elevated levels of troponin T and C-reactive protein are strongly related to the long-term risk of death from cardiac causes. These markers are independent risk factors, and their effects are additive with respect to each other and other clinical indicators of risk.


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From the Departments of Cardiology (B.L., H.T., L.W.) and Clinical Chemistry (A.S., P.V.), University of Uppsala, Uppsala, Sweden.

Address reprint requests to Dr. Lindahl at the Department of Cardiology, University Hospital, S-751 85 Uppsala, Sweden, or at bertil.lindahl{at}card.uas.lul.se.

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