Performance of highly sensitive cardiac troponin T assay to detect ischaemia at PET-CT in low-risk patients with acute coronary syndrome: a prospective observational study.

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State: Public
Version: Final published version
Serval ID
serval:BIB_3F31027138A6
Type
Article: article from journal or magazin.
Collection
Publications
Title
Performance of highly sensitive cardiac troponin T assay to detect ischaemia at PET-CT in low-risk patients with acute coronary syndrome: a prospective observational study.
Journal
BMJ open
Author(s)
Morawiec B., Fournier S., Tapponnier M., Prior J.O., Monney P., Dunet V., Lauriers N., Recordon F., Trana C., Iglesias J.F., Kawecki D., Boulat O., Bardy D., Lamsidri S., Eeckhout E., Hugli O., Muller O.
ISSN
2044-6055 (Electronic)
ISSN-L
2044-6055
Publication state
Published
Issued date
10/07/2017
Peer-reviewed
Oui
Volume
7
Number
7
Pages
e014655
Language
english
Notes
Publication types: Journal Article ; Observational Study
Publication Status: epublish
Abstract
Highly sensitive troponin T (hs-TnT) assay has improved clinical decision-making for patients admitted with chest pain. However, this assay's performance in detecting myocardial ischaemia in a lowrisk population has been poorly documented.
To assess hs-TnT assay's performance to detect myocardial ischaemia at positron emission tomography/CT (PET-CT) in low-risk patients admitted with chest pain.
Patients admitted for chest pain with a nonconclusive ECG and negative standard cardiac troponin T results at admission and after 6 hours were prospectively enrolled. Their hs-TnT samples were at T0, T2 and T6. Physicians were blinded to hs-TnT results. All patients underwent a PET-CT at rest and during adenosine-induced stress. All patients with a positive PET-CT result underwent a coronary angiography.
Forty-eight patients were included. Six had ischaemia at PET-CT. All of them had ≥1 significant stenosis at coronary angiography. Areas under the curve (95% CI) for predicting significant ischaemia at PET-CT using hs-TnT were 0.764 (0.515 to 1.000) at T0, 0.812(0.616 to 1.000) at T2 and 0.813(0.638 to 0.989) at T6. The receiver operating characteristicbased optimal cut-off value for hs-TnT at T0, T2 and T6 needed to exclude significant ischaemia at PET-CT was <4 ng/L. Using this value, sensitivity, specificity, positive and negative predictive values of hs-TnT to predict significant ischaemia were 83%/38%/16%/94% at T0, 100%/40%/19%/100% at T2 and 100%/43%/20%/100% at T6, respectively.
Our findings suggest that in low-risk patients, using the hs-TnT assay with a cut-off value of 4 ng/L demonstrates excellent negative predictive value to exclude myocardial ischaemia detection at PET-CT, at the expense of weak specificity and positive predictive value.
ClinicalTrials.gov Identifier: NCT01374607.

Keywords
Acute Coronary Syndrome/diagnostic imaging, Aged, Biomarkers/blood, Chest Pain/etiology, Clinical Decision-Making, Coronary Angiography, Female, Humans, Male, Middle Aged, Positron Emission Tomography Computed Tomography, Predictive Value of Tests, Prospective Studies, ROC Curve, Switzerland, Troponin T/blood, acute coronary syndrome, ischemia, positron emission tomography, troponin
Pubmed
Web of science
Open Access
Yes
Create date
19/07/2017 14:05
Last modification date
20/08/2019 14:36
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