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Salaun E, Drory S, Coté MA, Tremblay V, Bédard E, Steinberg C, Paré D, O'Connor K, Cieza T, Coté N, Poirier P, Douville P, Blais J, Desmeules P, Kalavrouziotis D, Mohammadi S, Voisine P, Bernier M, Pibarot P, Thériault S. Role of Antitroponin Antibodies and Macrotroponin in the Clinical Interpretation of Cardiac Troponin. J Am Heart Assoc 2024; 13:e035128. [PMID: 38879450 DOI: 10.1161/jaha.123.035128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/19/2024]
Abstract
Cardiac troponin is extensively used as a biomarker in modern medicine due to its diagnostic capability for myocardial injury, as well as its predictive and prognostic value for cardiac diseases. However, heterophile antibodies, antitroponin antibodies, and macrotroponin complexes can be observed both in seemingly healthy individuals and patients with cardiac diseases, potentially leading to false positive or disproportionate elevation of cTn (cardiac troponin) assay results and introducing discrepancies in clinical interpretations with impact on medical management. In this review article, we describe the possible mechanisms of cTn release and the sources of variations in the assessment of circulating cTn levels. We also explore the pathophysiological mechanisms underlying antitroponin antibody development and discuss the influence exerted by macrotroponin complexes on the results of immunoassays. Additionally, we explore approaches to detect these complexes by presenting various clinical scenarios encountered in routine clinical practice. Finally, unsolved questions about the development, prevalence, and clinical significance of cardiac autoantibodies are discussed.
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Affiliation(s)
- Erwan Salaun
- Institut Universitaire de Cardiologie et de Pneumologie de Québec Université Laval Québec Canada
| | - Samuel Drory
- Institut Universitaire de Cardiologie et de Pneumologie de Québec Université Laval Québec Canada
| | - Marc-André Coté
- Institut Universitaire de Cardiologie et de Pneumologie de Québec Université Laval Québec Canada
| | - Veronic Tremblay
- Institut Universitaire de Cardiologie et de Pneumologie de Québec Université Laval Québec Canada
| | - Elisabeth Bédard
- Institut Universitaire de Cardiologie et de Pneumologie de Québec Université Laval Québec Canada
| | - Christian Steinberg
- Institut Universitaire de Cardiologie et de Pneumologie de Québec Université Laval Québec Canada
| | - David Paré
- Institut Universitaire de Cardiologie et de Pneumologie de Québec Université Laval Québec Canada
| | - Kim O'Connor
- Institut Universitaire de Cardiologie et de Pneumologie de Québec Université Laval Québec Canada
| | - Tomas Cieza
- Institut Universitaire de Cardiologie et de Pneumologie de Québec Université Laval Québec Canada
| | - Nancy Coté
- Institut Universitaire de Cardiologie et de Pneumologie de Québec Université Laval Québec Canada
| | - Paul Poirier
- Institut Universitaire de Cardiologie et de Pneumologie de Québec Université Laval Québec Canada
- Faculty of pharmacy Université Laval Québec Canada
| | - Pierre Douville
- Centre Hospitalier Universitaire de Québec Université Laval Québec Canada
| | - Jonatan Blais
- Centre Hospitalier Universitaire de Québec Université Laval Québec Canada
| | - Philippe Desmeules
- Institut Universitaire de Cardiologie et de Pneumologie de Québec Université Laval Québec Canada
- Centre Hospitalier Universitaire de Québec Université Laval Québec Canada
| | - Dimitris Kalavrouziotis
- Institut Universitaire de Cardiologie et de Pneumologie de Québec Université Laval Québec Canada
| | - Siamak Mohammadi
- Institut Universitaire de Cardiologie et de Pneumologie de Québec Université Laval Québec Canada
| | - Pierre Voisine
- Institut Universitaire de Cardiologie et de Pneumologie de Québec Université Laval Québec Canada
- Division of Cardiac Surgery University of Ottawa Heart Institute Ottawa Ontario Canada
| | - Mathieu Bernier
- Institut Universitaire de Cardiologie et de Pneumologie de Québec Université Laval Québec Canada
| | - Philippe Pibarot
- Institut Universitaire de Cardiologie et de Pneumologie de Québec Université Laval Québec Canada
| | - Sébastien Thériault
- Institut Universitaire de Cardiologie et de Pneumologie de Québec Université Laval Québec Canada
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Kavsak PA, Ma J. Discordant High-Sensitivity Cardiac Troponin I Concentrations in the General Population. Clin Chem 2024; 70:562-564. [PMID: 38300840 DOI: 10.1093/clinchem/hvad224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2024]
Affiliation(s)
- Peter A Kavsak
- Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON, Canada
| | - Jinhui Ma
- Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, ON, Canada
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Wu AHB, Jaffe AS, Peacock WF, Kavsak P, Greene D, Christenson RH. The Role of Artificial Intelligence for Providing Scientific Content for Laboratory Medicine. J Appl Lab Med 2024; 9:386-393. [PMID: 38102068 DOI: 10.1093/jalm/jfad095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Accepted: 09/25/2023] [Indexed: 12/17/2023]
Abstract
BACKGROUND Artificial intelligence (AI) promises to become an important tool in the practice of laboratory medicine. AI programs are available online that can provide concise medical and laboratory information within seconds after a question is submitted. METHODS We posed the following contemporary and relevant question for clinical chemists using an AI program: "Should labs eliminate CK-MB testing?" The results of this inquiry were critically reviewed by a cardiologist, emergency department physician, and clinical laboratorians for accuracy and appropriateness. RESULTS An AI report answering this question was generated within 15 s. The experts felt that the information was inaccurate with the statements that CK-MB results are released earlier than cardiac troponin (cTn), and are more useful for detection of myocardial injury in patients with renal insufficiencies. The summary omitted discussion on the ongoing debate for periprocedural detection of acute myocardial infarction (MI), the perceived value for detection of reinfarction, the value in risk stratification compared to cTn, the economic justification for testing both CK-MB and cTn, and medicolegal aspects of testing when results are discordant. CONCLUSIONS At this time, AI does not appear to be ready to be used by clinical laboratories for answering important practice questions.
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Affiliation(s)
- Alan H B Wu
- Department of Laboratory Medicine, University of California, San Francisco, San Francisco, CA, United States
| | - Allan S Jaffe
- Departments of Cardiology and Laboratory Medicine, Mayo Clinic, Rochester, MN, United States
| | | | - Pete Kavsak
- Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON, Canada
| | - Dina Greene
- Department of Laboratory Medicine, University of Washington, Seattle, WA, United States
- LetsGetChecked Laboratories, Monrovia, CA, United States
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Lam L, Kyle C. Practical approaches to the detection of macrotroponin. Ann Clin Biochem 2024; 61:122-132. [PMID: 37578158 DOI: 10.1177/00045632231197301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/15/2023]
Abstract
INTRODUCTION Macrotroponin is increasingly recognised as a cause of confusion in interpreting high-sensitivity cardiac troponin (hs-cTnI) results. In this study, we sought to evaluate two practical approaches to detecting macrotroponin. These two approaches are PEG precipitation and SVM (support vector machine) analysis to classify discrepancies between hs-cTn assays. METHOD Residual serum and heparin plasma specimens (n = 483) with initially elevated hs-cTnI from hospital and community laboratories were retested on multiple hs-cTn platforms before and after PEG precipitation and Protein A immunoglobulin depletion. SVM analysis was conducted to identify a linear equation that best discriminated specimens with macrotroponin using a combination of results from two different hs-cTn assays. FINDINGS The diagnostic performance of PEG precipitation was carried out using Protein A immunoglobulin depletion as the reference comparator. When a cutoff residual activity after PEG precipitation of ≤ 20% was used, this threshold carried a high specificity of 92% (confidence interval 83-98%; n = 189) using the Siemens hs-cTnI Vista assay and 95% specificity (86%-98%; n = 242) using the Abbott hs-cTnI Architect assay. SVM analysis generated a linear equation identifying macrotroponin specimens from results obtained on two hs-cTn assays. This approach can be highly specific, comparable to PEG precipitation when certain assay combinations and concentrations are used. CONCLUSION We describe and identify practical alternatives to detecting macrotroponin. These approaches can be optimised for high specificity, reducing the need for more complex laboratory methods.
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Affiliation(s)
- Leo Lam
- Chemical Pathology, LabPlus, Auckland City Hospital, Auckland, New Zealand
- Biochemistry, Middlemore Hospital Laboratories, Auckland, New Zealand
| | - Campbell Kyle
- Chemical Pathology, LabPlus, Auckland City Hospital, Auckland, New Zealand
- Biochemistry, Labtests, Auckland, New Zealand
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Li L, Shu X, Zhang L, Xu A, Yang J, Jing Y, Wang H, Zhang Z. Evaluation of the analytical and clinical performance of a new high-sensitivity cardiac troponin I assay: hs-cTnI (CLIA) assay. Clin Chem Lab Med 2024; 62:353-360. [PMID: 37746851 DOI: 10.1515/cclm-2023-0529] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Accepted: 08/25/2023] [Indexed: 09/26/2023]
Abstract
OBJECTIVES Cardiac troponin (cTn) is the key biomarker for diagnosis of acute coronary syndrome (ACS). We performed a complete assessment of the high-sensitivity cardiac troponin I (hs-cTnI) (CLIA) assay on the analytical performance and clinical diagnostic performance, which was compared with Abbott ARCHITECT hs-cTnI assay. METHODS Sex-specific 99th percentile upper reference limits (URLs) were determined from a healthy population of 424 males and 408 females. High-sensitivity performance was assessed by examining the imprecision at sex-specific URLs and the detectable results above LoD in a cohort of healthy population. The diagnostic performance of the hs-cTnI (CLIA) assay was validated in a population of 934 patients with suspected ACS. RESULTS The 99th percentile URLs were 15.3 ng/L for female, 31.3 ng/L for male and 24.2 ng/L for overall population. The total imprecision near the sex-specific 99th percentile URLs were <5 %. 76.74 % of females, 97.12 % of males and 86.69 % of overall population had cTnI values exceeding the LoD, which met the criteria of high-sensitivity troponin assay. No cross-reactivity or interference was identified. The diagnostic sensitivity, specificity, PPV, NPV, and AUC of hs-cTnI (CLIA) assay were 97.97 , 90.70, 79.02, 99.21 % and 0.9885, respectively, which were comparable to ARCHITECT hs-cTnI assay. CONCLUSIONS hs-cTnI (CLIA) assay is a high-sensitivity troponin I method with high precision, sensitivity and specificity. The clinical diagnostic performance of hs-cTnI (CLIA) is comparable to the established ARCHITECT hs-cTnI assay. Mindray's hs-cTnI (CLIA) assay is an attractive alternative for diagnosis of myocardial infarction with a high level of accuracy and safety.
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Affiliation(s)
- Ling Li
- Clinical Laboratory of Wuhan Asia Heart Hospital, Wuhan, Hubei, P.R. China
| | - Xin Shu
- Clinical Laboratory of Wuhan Asia General Hospital, Wuhan, Hubei, P.R. China
| | - Litao Zhang
- Clinical Laboratory of Wuhan Asia General Hospital, Wuhan, Hubei, P.R. China
| | - Ao Xu
- Clinical Laboratory of Wuhan Asia Heart Hospital, Wuhan, Hubei, P.R. China
| | - Juan Yang
- Clinical Laboratory of Wuhan Asia Heart Hospital, Wuhan, Hubei, P.R. China
| | - Yisha Jing
- Clinical Laboratory of Wuhan Asia General Hospital, Wuhan, Hubei, P.R. China
| | - Hui Wang
- Clinical Laboratory of Wuhan Asia General Hospital, Wuhan, Hubei, P.R. China
| | - Zhenlu Zhang
- Clinical Laboratory of Wuhan Asia Heart Hospital, Wuhan, Hubei, P.R. China
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Kavsak PA, Hoard B, Mackett K, Mukherjee SD, Bordeleau L, Ellis PM, Dhesy-Thind S. Detection of Macrotroponin in Patients Receiving Treatment for Breast Cancer. CJC Open 2023; 5:658-660. [PMID: 37720180 PMCID: PMC10502437 DOI: 10.1016/j.cjco.2023.05.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/19/2023] Open
Affiliation(s)
| | - Brock Hoard
- McMaster University, Hamilton, Ontario, Canada
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Kavsak PA, Khattak S, Pogue E, Tandon V. An interference yielding divergent high-sensitivity cardiac troponin results on different instruments from the same manufacturer. Clin Chim Acta 2023; 548:117450. [PMID: 37348628 DOI: 10.1016/j.cca.2023.117450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 06/12/2023] [Accepted: 06/14/2023] [Indexed: 06/24/2023]
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