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January 31, 2026Canadian Journal of Emergency Medicine1 citations

Two- vs three-hour hs-cTnI algorithms for ruling out acute myocardial infarction using the Beckman access high-sensitivity cardiac troponin I: a systematic review

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AMAngela MakYCY. CHENIKInam Khalfan

Key Result

The 0/2-h and 0/3-h hs-cTnI algorithms using the Beckman Access assay demonstrated high sensitivity (>97.7%) and negative predictive value (>98.9%) for ruling out acute myocardial infarction.

Key Points

  • This review aims to assess the accuracy of 0/2-h and 0/3-h hs-cTnI algorithms for ruling out acute myocardial infarction in emergency settings.
  • Conducted an electronic search across Medline, Embase, and Wiley Cochrane Library
  • Screened relevant studies and extracted data by a review team
  • Appraised study quality and risk using the QUADAS-2 tool
  • Both 0/2-h and 0/3-h hs-cTnI algorithms demonstrated high sensitivity (>97.7%) for ruling out myocardial infarction.
  • Negative predictive values exceeded 98.9% for both algorithms.
  • Two studies indicated that the 2-h hs-cTnI algorithm is similarly accurate as the 3-h protocol, with potential operational benefits.

Study Design

Type

Systematic Review

Structured PICO

Does a 0/2-h hs-cTnI algorithm using the Beckman Access assay accurately rule out acute myocardial infarction compared to a 0/3-h algorithm in ED patients with suspected ACS?

P
Population
Patients presenting to emergency departments with symptoms of suspected acute coronary syndrome (5 studies included)
I
Intervention
0/2-h algorithm using the Beckman Access high-sensitivity cardiac troponin I (hs-cTnI) assay
C
Comparator
0/3-h algorithm using the Beckman Access hs-cTnI assay
O
Outcome
Accuracy (sensitivity and negative predictive value) for ruling out acute myocardial infarctionsurrogate

A 2-hour hs-cTnI algorithm using the Beckman Access assay can effectively rule out acute myocardial infarction with similar accuracy to a 3-hour protocol, potentially leading to operational gains in the ED.

Limitations

  • No studies directly compared the 0 h/2 h and 0 h/3 h algorithms
  • Heterogeneity in study design precluded meta-analysis

Abstract

BACKGROUND: Patients with symptoms of acute coronary syndrome make up a significant proportion of emergency department (EDs) presentations. High-sensitivity troponin testing is a standard component of evaluating patients with suspected symptomatic coronary disease. We sought to synthesize the evidence of the accuracy of 0/2-h and 0/3-h algorithms using the Beckman Access high-sensitivity cardiac troponin I (hs-cTnI) assay. METHODS: We developed an electronic search strategy retrieving research from three electronic databases (Medline, Embase, and Wiley Cochrane Library). Relevant research studies were screened and data extracted by a team of reviewers. Study quality and risk assessment were appraised using the QUADAS-2 tool. Findings were reported according to PRISMA guidelines. RESULTS: Five studies met inclusion criteria. No studies directly compared the 0 h/2 h and 0 h/3 h algorithms using the Beckman Coulter Access hs-cTnI assay, and heterogeneity in study design precluded meta-analysis. Included studies variably used 2-h, 3-h, or intermediate timepoints for serial troponin measurement. All studies reported consistently high sensitivity (> 97.7%) and NPV (> 98.9%) for ruling out acute myocardial infarction, supporting the reliability of both 0/2 h and 0/3 h hs-cTnI algorithms in the ED. CONCLUSIONS: Of the five studies included, two studies suggest that a two-hour hs-TnI algorithm can effectively rule out myocardial infarction with similar accuracy to a longer three-hour protocol. Use of a 2-h hs-cTnI algorithm may lead to operational gains compared to a 3-h serial testing algorithm. RéSUMé: CONTEXTE: Les patients présentant des symptômes de syndrome coronarien aigu représentent une proportion importante des présentations aux services d’urgence (SU). Le test de la troponine à haute sensibilité est une composante standard de l’évaluation des patients atteints d’une maladie coronarienne symptomatique suspectée. Nous avons cherché à synthétiser les preuves de la précision des algorithmes 0/2-heure et 0/3-heure en utilisant le test de troponine I cardiaque haute sensibilité (hs-cTnI) de Beckman Access. MéTHODES: Nous avons développé une stratégie de recherche électronique en récupérant des recherches dans trois bases de données électroniques (Medline, Embase et Wiley Cochrane Library). Les études de recherche pertinentes ont été filtrées et les données extraites par une équipe d’examinateurs. La qualité de l’étude et l’évaluation des risques ont été évaluées à l’aide de l’outil QUADAS-2. Les résultats ont été rapportés conformément aux directives PRISMA. RéSULTATS: Cinq études répondaient aux critères d’inclusion. Aucune étude n’a directement comparé les algorithmes 0h/2h et 0h/3h en utilisant le test hs-cTnI de Beckman Coulter Access, et l’hétérogénéité dans la conception de l’étude a empêché une méta-analyse. Études incluses utilisant de manière variable des temps intermédiaires de 2 heures, 3 heures ou plus pour la mesure en série de la troponine. Toutes les études ont rapporté une sensibilité élevée constante (>97,7 %) et une VPN (>98,9 %) pour exclure un infarctus du myocarde aigu, soutenant la fiabilité des algorithmes hs-cTnI 0/2h et 0/3h dans l’ED. CONCLUSION: Sur les cinq études incluses, deux études suggèrent qu’un algorithme hs-TnI de deux heures peut efficacement exclure l’infarctus du myocarde avec une précision similaire à un protocole plus long de trois heures. L’utilisation d’un algorithme hs-cTnI de 2 heures peut entraîner des gains opérationnels par rapport à un algorithme de test en série de 3 heures.

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Cite This Study

Mak et al. (2026) conducted a systematic review in Acute myocardial infarction. 0/2-h and 0/3-h hs-cTnI algorithms (Beckman Access) was evaluated on Ruling out acute myocardial infarction. The 0/2-h and 0/3-h hs-cTnI algorithms using the Beckman Access assay demonstrated high sensitivity (>97.7%) and negative predictive value (>98.9%) for ruling out acute myocardial infarction.

synapsesocial.com/papers/6a02591345880192ae423dcdhttps://doi.org/10.1007/s43678-025-01085-z
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