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Editorial |
1
Department of Laboratory Medicine, and Pathology, University of Minnesota, School of Medicine, Minneapolis, MN 55415
2
Department of Pathology, Hartford Hospital, Hartford, CT 06102
a Address correspondence to this author at: Hennepin County Medical Center, Clinical Laboratories MC 812, 701 Park Ave., Minneapolis MN 55415. Fax 612-904-4229; e-mail
fred.apple@co.hennepin.mn.us.
As we move into the new Millennium, "the times they are a changin" regarding the diagnostic criteria used to rule in and rule out acute myocardial infarction (AMI) (1). The purpose of this editorial is to comment on the new cardiology guidelines for the redefinition of AMI and unstable angina, as well as to compare them with previously published laboratory medicine recommendations. Some of the new recommendations made by clinical groups may appear to be in conflict with those published previously by laboratory medicine groups; thus, we document the chronology and evolution of all guidelines on the use of cardiac markers.
Consensus documents recently published by the European Society of Cardiology (ESC), the American College of Cardiology (ACC), and the American Heart Association (AHA) make specific recommendations on the use of biomarkers for the detection of myocardial infarction (MI) (2)(3)(4)(5). The redefined criteria used to classify acute coronary syndrome (ACS) patients presenting with ischemic symptoms as acute, evolving, or recent MI are heavily predicated on an increased serum/plasma cardiac troponin (I or T) concentration (2)(3)(4). Furthermore, in the new ACC/AHA guidelines for management of patients with unstable angina and non-ST-segment elevation MI (NSTEMI), an increased cardiac troponin value establishes the diagnosis of NSTEMI, whereas a normal cardiac troponin value establishes the diagnosis of unstable angina in ACS patients with ischemic discomfort (5).
The new guidelines emphasize the following clinical issues. First,
increases of cardiac troponins are indicative of myocardial injury but
are not synonymous with MI or an ischemic mechanism of injury. If an
ischemic mechanism of injury is unlikely, other etiologies of
myocardial injury should be pursued. Second, increases in cardiac
troponin likely reflect irreversible rather than reversible injury,
although there
References
The following articles in journals at HighWire Press have cited this article:
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R Sharma, D C Gaze, D Pellerin, R L Mehta, H Gregson, C P Streather, P O Collinson, and S J D Brecker Cardiac structural and functional abnormalities in end stage renal disease patients with elevated cardiac troponin T Heart, June 1, 2006; 92(6): 804 - 809. [Abstract] [Full Text] [PDF] |
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F. S. Apple, C. A. Parvin, K. F. Buechler, R. H. Christenson, A. H.B. Wu, and A. S. Jaffe Validation of the 99th Percentile Cutoff Independent of Assay Imprecision (CV) for Cardiac Troponin Monitoring for Ruling Out Myocardial Infarction Clin. Chem., November 1, 2005; 51(11): 2198 - 2200. [Full Text] [PDF] |
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M. Panteghini, F. Pagani, K.-T. J. Yeo, F. S. Apple, R. H. Christenson, F. Dati, J. Mair, J. Ravkilde, and A. H.B. Wu Evaluation of Imprecision for Cardiac Troponin Assays at Low-Range Concentrations Clin. Chem., February 1, 2004; 50(2): 327 - 332. [Abstract] [Full Text] [PDF] |
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J. C. Lin, F. S. Apple, M. M. Murakami, and R. V. Luepker Rates of Positive Cardiac Troponin I and Creatine Kinase MB Mass among Patients Hospitalized for Suspected Acute Coronary Syndromes Clin. Chem., February 1, 2004; 50(2): 333 - 338. [Abstract] [Full Text] [PDF] |
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J. T. MacGregor The Future of Regulatory Toxicology: Impact of the Biotechnology Revolution Toxicol. Sci., October 1, 2003; 75(2): 236 - 248. [Abstract] [Full Text] [PDF] |
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F. S. Apple, H. E. Quist, P. J. Doyle, A. P. Otto, and M. M. Murakami Plasma 99th Percentile Reference Limits for Cardiac Troponin and Creatine Kinase MB Mass for Use with European Society of Cardiology/American College of Cardiology Consensus Recommendations Clin. Chem., August 1, 2003; 49(8): 1331 - 1336. [Abstract] [Full Text] [PDF] |
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D. A. Morrow, N. Rifai, M. S. Sabatine, S. Ayanian, S. A. Murphy, J. A. de Lemos, E. Braunwald, and C. P. Cannon Evaluation of the AccuTnI Cardiac Troponin I Assay for Risk Assessment in Acute Coronary Syndromes Clin. Chem., August 1, 2003; 49(8): 1396 - 1398. [Full Text] [PDF] |
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S. Eriksson, M. Junikka, P. Laitinen, K. Majamaa-Voltti, H. Alfthan, and K. Pettersson Negative Interference in Cardiac Troponin I Immunoassays from a Frequently Occurring Serum and Plasma Component Clin. Chem., July 1, 2003; 49(7): 1095 - 1104. [Abstract] [Full Text] [PDF] |
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R. Ziebig, A. Lun, B. Hocher, F. Priem, C. Altermann, G. Asmus, H. Kern, R. Krause, B. Lorenz, R. Mobes, et al. Renal Elimination of Troponin T and Troponin I Clin. Chem., July 1, 2003; 49(7): 1191 - 1193. [Full Text] [PDF] |
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M. Beciani, A. Tedesco, A. Violante, S. Cipriani, M. Azzarito, A. Sturniolo, and G. Splendiani Cardiac troponin I (2nd generation assay) in chronic haemodialysis patients: prevalence and prognostic value Nephrol. Dial. Transplant., May 1, 2003; 18(5): 942 - 946. [Abstract] [Full Text] [PDF] |
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M. Herrmann, J. Scharhag, M. Miclea, A. Urhausen, W. Herrmann, and W. Kindermann Post-Race Kinetics of Cardiac Troponin T and I and N-Terminal Pro-Brain Natriuretic Peptide in Marathon Runners Clin. Chem., May 1, 2003; 49(5): 831 - 834. [Full Text] [PDF] |
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Y. E.C. Taes, N. H. Lameire, M. L. De Buyzere, A. Shoja, G. De Backer, and J. R. Delanghe Exercise-induced Myocardial Ischemia Is Accompanied by Increased Serum Creatine Concentrations Clin. Chem., April 1, 2003; 49(4): 684 - 686. [Full Text] [PDF] |
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F. S. Apple, M. M. Murakami, L. A. Pearce, and C. A. Herzog Predictive Value of Cardiac Troponin I and T for Subsequent Death in End-Stage Renal Disease Circulation, December 3, 2002; 106(23): 2941 - 2945. [Abstract] [Full Text] [PDF] |
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J. R. Tate, T. Badrick, G. Koumantakis, J. M. Potter, and P. E. Hickman Reporting of Cardiac Troponin Concentrations Clin. Chem., November 1, 2002; 48(11): 2077 - 2080. [Full Text] [PDF] |
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A. H.B. Wu and F. S. Apple Drs. Wu and Apple respond: Clin. Chem., November 1, 2002; 48(11): 2080 - 2082. [Full Text] [PDF] |
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M. Panteghini Acute Coronary Syndrome: Biochemical Strategies in the Troponin Era Chest, October 1, 2002; 122(4): 1428 - 1435. [Abstract] [Full Text] [PDF] |
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F. S. Apple, M. M. Murakami, R. L. Jesse, M. A. Levitt, A. K. Berger, L. A. Pearce, and P. Collinson Near-Bedside Whole-Blood Cardiac Troponin I Assay for Risk Assessment of Patients with Acute Coronary Syndromes Clin. Chem., October 1, 2002; 48(10): 1784 - 1787. [Full Text] [PDF] |
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V. Scharnhorst, H. L. Vader, and F. van der Graaf Characteristics of the Cardiac Troponin I Assay on the Immulite 2000 Analyzer Clin. Chem., September 1, 2002; 48(9): 1626 - 1627. [Full Text] [PDF] |
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D. Peetz, G. Hafner, and K. J. Lackner Analytical Characteristics of the AxSYM Cardiac Troponin I and Creatine Kinase MB Assays Clin. Chem., July 1, 2002; 48(7): 1110 - 1111. [Full Text] [PDF] |
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M. Panteghini Performance of Today's Cardiac Troponin Assays and Tomorrow's Clin. Chem., June 1, 2002; 48(6): 809 - 810. [Full Text] [PDF] |
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D. Uettwiller-Geiger, A. H.B. Wu, F. S. Apple, A. W. Jevans, P. Venge, M. D. Olson, C. Darte, D. L. Woodrum, S. Roberts, and S. Chan Multicenter Evaluation of an Automated Assay for Troponin I Clin. Chem., June 1, 2002; 48(6): 869 - 876. [Abstract] [Full Text] [PDF] |
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A. Cerutti, L. Corsini, R. Finotto, and C. Perazzi Comparison of Cardiac Troponin I in Serum and Heparin Plasma with the Dimension RxL Assay Clin. Chem., May 1, 2002; 48(5): 790 - 791. [Full Text] [PDF] |
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G. P. Armstrong, A. N. Barker, H. Patel, and H. H. Hart Reference Interval for Troponin I on the ACS:Centaur Assay: A Recommendation Based on the Recent Redefinition of Myocardial Infarction Clin. Chem., January 1, 2002; 48(1): 198 - 199. [Full Text] [PDF] |
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F. S. Apple, A. S. Jaffe, L. K. Newby, A. L. Kaplan, R. H. Tuttle, S. E. McNulty, E. M. Ohman, A. B. Storrow, W. B. Gibler, J. L. Garvey, et al. Bedside Multimarker Testing for Risk Stratification in Chest Pain Units: The Chest Pain Evaluation by Creatine Kinase-MB, Myoglobin, and Troponin I (CHECKMATE) Study Response Circulation, November 27, 2001; 104 (22): e125 - e126. [Full Text] [PDF] |
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