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A correction has been published: N Engl J Med 1999;341(7):548.

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Volume 340:1623-1629 May 27, 1999 Number 21
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Benefit of Abciximab in Patients with Refractory Unstable Angina in Relation to Serum Troponin T Levels
Christian W. Hamm, M.D., Christopher Heeschen, M.D., Britta Goldmann, M.D., Alec Vahanian, M.D., Jennifer Adgey, M.D., Carlos Macaya Miguel, M.D., Wolfgang Rutsch, M.D., Juergen Berger, Ph.D., Jille Kootstra, Maarten L. Simoons, M.D., for The c7E3 Fab Antiplatelet Therapy in Unstable Refractory Angina (CAPTURE) Study Investigators

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ABSTRACT

Background In patients with refractory unstable angina, the platelet glycoprotein IIb/IIIa–receptor antibody abciximab reduces the incidence of cardiac events before and during coronary angioplasty. We investigated whether serum troponin T levels identify patients most likely to benefit from therapy with this drug.

Methods Among 1265 patients with unstable angina who were enrolled in the c7E3 Fab Antiplatelet Therapy in Unstable Refractory Angina (CAPTURE) trial, serum samples drawn at the time of randomization to abciximab or placebo were available from 890 patients; we used these samples for the determination of troponin T and creatine kinase MB levels. Patients with postinfarction angina were not included.

Results Serum troponin T levels at the time of study entry were elevated (above 0.1 ng per milliliter) in 275 patients (30.9 percent). Among patients receiving placebo, the risk of death or nonfatal myocardial infarction was related to troponin T levels. The six-month cumulative event rate was 23.9 percent among patients with elevated troponin T levels, as compared with 7.5 percent among patients without elevated troponin T levels (P<0.001). Among patients treated with abciximab, the respective six-month event rates were 9.5 percent for patients with elevated troponin T levels and 9.4 percent for those without elevated levels. As compared with placebo, the relative risk of death or nonfatal myocardial infarction associated with treatment with abciximab in patients with elevated troponin T levels was 0.32 (95 percent confidence interval, 0.14 to 0.62; P=0.002). The lower event rates in patients receiving abciximab were attributable to a reduction in the rate of myocardial infarction (odds ratio, 0.23; 95 percent confidence interval, 0.12 to 0.49; P<0.001). In patients without elevated troponin T levels, there was no benefit of treatment with respect to the relative risk of death or myocardial infarction at six months (odds ratio, 1.26; 95 percent confidence interval, 0.74 to 2.31; P=0.47).

Conclusions The serum troponin T level, which is considered to be a surrogate marker for thrombus formation, identifies a high-risk subgroup of patients with refractory unstable angina suitable for coronary angioplasty who will particularly benefit from antiplatelet treatment with abciximab.


Source Information

From the Department of Cardiology (C.W.H., C.H., B.G.) and the Institute of Mathematics and Computer Science in Medicine (J.B.), University Hospital Eppendorf, Hamburg, Germany; the Service de Cardiologie, Hôpital Tenon, Paris (A.V.); the Cardiac Department of the Royal Victoria Hospital, Belfast, Northern Ireland (J.A.); Unidad de Hemodinamica, Hospital Universitario San Carlos, Madrid (C.M.M.); the Department of Cardiology, Charité University Hospital, Berlin, Germany (W.R.); and Cardialysis and Erasmus University, Rotterdam, the Netherlands (J.K., M.L.S.). Presented in part at the 47th Annual Scientific Session of the American College of Cardiology, Atlanta, March 29–April 1, 1998.

Address reprint requests to Dr. Hamm at Kerckhoff Heart Center, Benekestrasse 2-8, D-61231 Bad Nauheim, Germany, or at christian. hamm{at}kerckhoff.med.uni-giessen.de.

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Related Letters:

Troponin T Levels and Abciximab Therapy in Unstable Angina
Lev E. I., Osende J. I., Zaman A. G., Hamm C. W., Heeschen C.
Extract | Full Text  
N Engl J Med 1999; 341:1084-1085, Sep 30, 1999. Correspondence

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