The utility of presentation and 4-hour high sensitivity troponin I to rule-out acute myocardial infarction in the emergency department, Clinical Biochemistry (2015Biochemistry ( ), doi: 10.1016Biochemistry ( /j.clinbiochem.2015 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.The utility of presentation and 4-hour high sensitivity troponin I to rule-out acute myocardial infarction in the emergency department.
A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT2 Abstract a) Objectives: International guidance recommends that early serial sampling of high sensitivity troponin be used to accurately identify acute myocardial infarction (AMI) in chest pain patients.The background evidence for this approach is limited. We evaluated whether on presentation and 4-hour high-sensitivity troponin I (hs-cTnI) could be used to accurately rule-out AMI.b) Design and Methods: hs-cTnI was measured on presentation and at 4-hours in adult patients attending an emergency department with possible acute coronary syndrome. We determined the sensitivity for AMI for at least one hs-cTnI above the 99th percentile for a healthy population or alone or in combination with new ischemic ECG changes. Both overall and sex-specific 99th percentiles were assessed.. Patients with negative tests were designated low-risk. d) Conclusion: Hs-cTnI >99th percentile thresholds measured on presentation and at 4-hours was not a safe strategy to rule-out AMI in this clinical setting irrespective of whether sex-specific 99th percentiles were used, or whether hs-cTnI was combined with ECG results.