Two-hour diagnostic algorithms for early assessment of patients with acute chest pain - Implications of lowering the cardiac troponin I cut-off to the 97.5th percentile
2015 (English)In: Clinica Chimica Acta, ISSN 0009-8981, E-ISSN 1873-3492, Vol. 445, 19-24 p.Article in journal (Refereed) Published
Aims: Assessment of patients with suspected non-ST elevation myocardial infarction (NSTEMI) is based on cardiac troponin (cTn) levels with the 99th percentile as cut-off. However, cardiovascular risk starts already at lower troponin concentrations. We therefore, aimed to investigate the utility of 2-hour algorithms using the high-sensitivity cardiac troponin I (hs-cTnI) 97.5th percentile as cut-off which corresponds to the standard URL for most biomarkers. Methods: Hs-cTnI was measured at presentation and 2 h in 1624 chest pain patients. Diagnostic algorithms were developed applying hs-cTnI levels dichotomized at the 99th and 97.5th percentiles combined with hs-cTnI changes and/or ECG findings. Results: The prevalence of NSTEMI was 13.9%. The adjusted odds ratios for 1-year mortality were 2.7(95% CI 1.4-5.1) for the 99th percentile and 3.1 (95% CI 1.6-5.9) for the 97.5th percentile. The best-performing 99th percentile-based algorithms provided a positive predictive value (PPV) of 863% and a negative predictive value (NPV) of 993%. Using 97.5th percentile-based algorithms to define NSTEMI resulted in few reclassifications and yielded similar diagnostic estimates (PPV 85.4%, NPV 99.4%). Conclusion: The hs-cTnI 97.5th percentile integrated into 2-hour algorithms provided high diagnostic estimates and could, due to better prognostic properties serve as an alternative to the 99th percentile.
Place, publisher, year, edition, pages
2015. Vol. 445, 19-24 p.
Cardiac troponin, Chest pain, Myocardial infarction, Emergency department, Diagnosis
Biomedical Laboratory Science/Technology
IdentifiersURN: urn:nbn:se:uu:diva-256231DOI: 10.1016/j.cca.2015.03.002ISI: 000355024100005PubMedID: 25771107OAI: oai:DiVA.org:uu-256231DiVA: diva2:826376