Evidence map›Paper›PMID 34530937›Full record

ReviewBiomarker research2021

Blood biomarkers for mild traumatic brain injury: a selective review of unresolved issues.

Daniel B Hier, Tayo Obafemi-Ajayi, Matthew S Thimgan, Gayla R Olbricht, Sima Azizi, Blaine Allen, Bassam A Hadi, Donald C Wunsch

Abstract readReview
In one paragraph

Review in Biomarker research, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 64 papers, 3 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
64citing papers in PubMed, 3 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

64 citing papers in PubMed, 3 syntheses or guidelines pooled it.

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  14. Performance and accuracy of blood glucose and neutrophil-lymphocyte ratio as predictors of mortality in children and adolescents with traumatic brain injury.Child's nervous system : ChNS : official journal of the International Society for Pediatric Neurosurgery · 2026
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4 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

8 authors.

Daniel B HierDepartment of Electrical and Computer Engineering, Missouri University of Science and Technology, Rolla, MO 65401, USA. hierd@mst.edu.ORCID http://orcid.org/0000-0002-6179-0793
Tayo Obafemi-AjayiCooperative Engineering Program, Missouri State University, Springfield, MO 65897, United States.
Matthew S ThimganDepartment of Biological Sciences, Missouri University of Science and Technology, Rolla, MO 65409, United States.
Gayla R OlbrichtDepartment of Mathematics and Statistics, Missouri University of Science and Technology, Rolla, MO 65409, United States.
Sima AziziDepartment of Electrical and Computer Engineering, Missouri University of Science and Technology, Rolla, MO 65401, USA.
Blaine AllenDepartment of Electrical and Computer Engineering, Missouri University of Science and Technology, Rolla, MO 65401, USA.
Bassam A HadiDepartment of Surgery, Mercy Hospital, St. Louis MO, Missouri, MO 63141, United States.
Donald C WunschDepartment of Electrical and Computer Engineering, Missouri University of Science and Technology, Rolla, MO 65401, USA.

Funding

Mathematical modeling of Drosophila sleepR15GM117507 · NIGMS · MISSOURI UNIVERSITY OF SCIENCE & TECHNOLOGY · PI OLBRICHT, GAYLA R, SAMARANAYAKE, V.A. · 2016 to 2016
$422k
National Science Foundation W911NF-14-2-0034NIGMS NIH HHS R15 GM117507NIH HHS R15 GM117507-01A1
6 · The paper itself

Abstract

backgroundThe use of blood biomarkers after mild traumatic brain injury (mTBI) has been widely studied. We have identified eight unresolved issues related to the use of five commonly investigated blood biomarkers: neurofilament light chain, ubiquitin carboxy-terminal hydrolase-L1, tau, S100B, and glial acidic fibrillary protein. We conducted a focused literature review of unresolved issues in three areas: mode of entry into and exit from the blood, kinetics of blood biomarkers in the blood, and predictive capacity of the blood biomarkers after mTBI.

findingsAlthough a disruption of the blood brain barrier has been demonstrated in mild and severe traumatic brain injury, biomarkers can enter the blood through pathways that do not require a breach in this barrier. A definitive accounting for the pathways that biomarkers follow from the brain to the blood after mTBI has not been performed. Although preliminary investigations of blood biomarkers kinetics after TBI are available, our current knowledge is incomplete and definitive studies are needed. Optimal sampling times for biomarkers after mTBI have not been established. Kinetic models of blood biomarkers can be informative, but more precise estimates of kinetic parameters are needed. Confounding factors for blood biomarker levels have been identified, but corrections for these factors are not routinely made. Little evidence has emerged to date to suggest that blood biomarker levels correlate with clinical measures of mTBI severity. The significance of elevated biomarker levels thirty or more days following mTBI is uncertain. Blood biomarkers have shown a modest but not definitive ability to distinguish concussed from non-concussed subjects, to detect sub-concussive hits to the head, and to predict recovery from mTBI. Blood biomarkers have performed best at distinguishing CT scan positive from CT scan negative subjects after mTBI.

Indexed as

Blood biomarkersConcussionCT scanGFAPKineticsMild traumatic brain injuryNF-LReturn to sportS100BTauUCH-L1

Identifiers

PMID34530937
PMCPMC8447604

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.