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Related Concept Videos

Blood Studies for Cardiovascular System I: Cardiac Biomarkers01:20

Blood Studies for Cardiovascular System I: Cardiac Biomarkers

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Cardiac biomarkers are enzymes, proteins, and hormones released into the blood when cardiac cells are injured. They are powerful tools for triaging.
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Inductively coupled plasma–mass spectrometry (ICP–MS) is a highly selective and sensitive technique for accurate elemental analysis. Though the analysis of ICP–MS mass spectra is comparatively straightforward, it is affected by spectroscopic and non-spectroscopic interferences. Spectroscopic interferences arise when the plasma contains ionic species with an m/z value the same as the analyte ion. Spectroscopic interference can be categorized as isobaric, polyatomic ions, and...
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Diagnosing acute coronary syndrome or ACS begins with a thorough patient history. Notable symptoms include central, crushing chest pain radiating to the left arm, neck, jaw, or back, along with shortness of breath, sweating (diaphoresis), nausea, vomiting, dizziness, and palpitations.It is crucial to note any history of cardiac illnesses and assess risk factors, including age, gender, smoking, hypertension, diabetes, hyperlipidemia, and a sedentary lifestyle.During physical examination, vital...
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Methods for analyzing positive cardiac troponin assay interference.

Ola Hammarsten1, Charlotte Becker2, Anna E Engberg2

  • 1Department of Clinical Chemistry and Transfusion Medicine, Sahlgrenska Academy at University of Gothenburg, SE41345 Gothenburg, Sweden.

Clinical Biochemistry
|March 8, 2023
PubMed
Summary
This summary is machine-generated.

Analyzing cardiac troponin I (cTnI) assay interference is crucial for accurate myocardial infarction (MI) diagnosis. Methods like protein G spin columns and ultracentrifugation effectively identify interfering macrocomplexes, ensuring reliable patient results.

Keywords:
Cardiac troponinHeterophile antibodiesInterferenceMacrotroponin

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Area of Science:

  • Clinical Chemistry
  • Biomarker Analysis
  • Diagnostic Assay Development

Background:

  • Cardiac troponin T (cTnT) and troponin I (cTnI) are key biomarkers for myocardial infarction (MI) diagnosis.
  • Assay interference, often due to macrotroponin or heterophilic antibodies, can lead to false-positive cTnI results, complicating clinical decisions.
  • Accurate identification of troponin assay interference is vital for correct patient management.

Purpose of the Study:

  • To describe and compare four distinct methods for analyzing cardiac troponin I (cTnI) assay interference.
  • To evaluate the efficacy of protein G spin column, gel filtration chromatography, and two sucrose gradient ultracentrifugation techniques in detecting cTnI interference.
  • To assess the performance of these methods in a clinical setting with patients exhibiting confirmed cTnI interference.

Main Methods:

  • Utilized protein G spin column method, gel filtration chromatography, and two sucrose gradient ultracentrifugation methods.
  • Analyzed samples from five patients with confirmed cTnI interference and one MI patient without interference.
  • Focused on identifying high-molecular-weight immunocomplexes (macrotroponin) and heterophilic antibody-mediated interference.

Main Results:

  • The protein G spin column method demonstrated high between-run variability but successfully identified all five patients with cTnI interference.
  • Sucrose gradient ultracentrifugation methods and gel filtration chromatography exhibited similar performance.
  • Both ultracentrifugation and gel filtration methods accurately identified the specific immunocomplexes responsible for cTnI assay interference.

Conclusions:

  • The evaluated methods, including sucrose gradient ultracentrifugation and gel filtration chromatography, are sufficient for confirming or excluding positive cTnI assay interference.
  • These techniques provide reliable means to address diagnostic challenges posed by troponin assay interference.
  • Accurate interference analysis ensures the integrity of cTnI results in clinical practice.