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Updated: Oct 29, 2025

A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
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A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis

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Diagnostic algorithms for non-ST-segment elevation myocardial infarction: open issues

Aldo Clerico1, Alberto Aimo1, Martina Zaninotto2

  • 1Scuola Superiore Sant'Anna e Fondazione CNR - Regione Toscana G. Monasterio, Pisa, Italy.

Clinical Chemistry and Laboratory Medicine
|July 5, 2021
PubMed

Insights

Serial measurement of cardiac troponin (cTn) aids myocardial infarction (MI) diagnosis. This review examines factors affecting high-sensitivity cTn (hs-cTn) changes and their impact on diagnosing non-ST-segment elevation MI (NSTEMI).

Area of Science:

  • Cardiology
  • Biochemistry

Background:

  • Serial measurement of cardiac troponin (cTn) is a cornerstone for diagnosing myocardial infarction (MI) since 2000.
  • High-sensitivity cardiac troponin (hs-cTn) assays have improved diagnostic capabilities.

Purpose of the Study:

  • To analyze factors influencing temporal changes in hs-cTn levels.
  • To evaluate the impact of these changes on the diagnosis of non-ST-segment elevation myocardial infarction (NSTEMI).
  • To identify discrepancies in recent international guidelines (2020-2021) for acute coronary syndromes (ACS).

Main Methods:

  • Review of international guidelines for ACS management.
  • Analysis of factors affecting hs-cTn kinetics.
  • Evaluation of diagnostic criteria for NSTEMI.

Main Results:

  • Significant discrepancies exist among recent guidelines regarding hs-cTn cut-off and absolute change values for NSTEMI rule-in.
  • Lack of consensus on sex-specific cut-off values for hs-cTn.
  • Insufficient evidence on the diagnostic accuracy and cost-effectiveness of proposed hs-cTn algorithms.

Conclusions:

  • Current guidelines show variability in hs-cTn interpretation for NSTEMI diagnosis.
  • Further research is needed to standardize hs-cTn use, particularly concerning sex-specific values and algorithmic approaches.
  • Harmonization of guidelines is crucial for consistent clinical practice in ACS management.

Keywords:
cardiac troponinscardiovascular riskguidelineshigh-sensitivity immunoassayquality specificationreference population

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