Abstract:
OBJECTIVE:Activation of the inflammatory cascade is a known pathophysiologic process in severe traumatic brain injury (TBI) with yet non-standardized scientific data regarding relationship to outcome. The understanding of the time course of expression of cerebrospinal fluid (CSF) biomarker levels following severe TBI is an important step toward using these biomarkers to measure injury severity and/or early response to therapeutic interventions. The objective of the current study is to report the time course and values of a battery of CSF inflammatory biomarkers following severe TBI in our reasonably sized patient cohort. PATIENTS AND METHODS:Our patient cohort consists of 32 consented patients, who met the study's inclusion criteria for data collection from 2000 to 2010. The time course and values of a battery of CSF biomarkers (IL-1β, IL-6, TNF-α, IFN-γ, IL-12p70, IL-10, and IL-8) following severe TBI in this patient cohort was characterized. Additionally, the correlation of biomarker concentration with 6-month neurological outcome was assessed. Serial CSF sampling through an external ventricular drain was performed over the first five days following injury. Concentration of a panel of inflammatory biomarkers (IL-1β, IL-6, TNF-α, IFN-γ, IL-12p70, IL-10, and IL-8) were evaluated using Meso Scale Discovery's Multi-Array technology. Glasgow Outcome Scale (GOS) score at six months following injury was dichotomized into poor outcome (GOS 1-3) and favorable outcome (GOS 4-5). Statistical analyses were performed using Kruskal-Wallis test and linear regression analysis. RESULTS:The result shows that CSF concentrations of inflammatory biomarkers had a significant association with 6-month neurological outcome (p-values≤0.05 for each marker), with the favorable outcome group having lower concentrations of these biomarkers on average, in comparison to the poor neurologic outcome group over the first five days after TBI. All inflammatory biomarkers decreased to normal levels by post-trauma day 5, except for IL-6 and IL-8. Upregulation and increased expression of key inflammatory markers following severe TBI were significant predictors of worse 6-month neurologic outcome. Additionally, post-trauma day 5 concentrations of IL-6 and IL-8 remained elevated over normal CSF values. CONCLUSION:The study shows that inflammatory biomarkers in CSF are potential biomarkers of injury severity and progression and/or recovery; they could prove beneficial in the future assessment of injury severity and response to therapy after severe TBI.
journal_name
Clin Neurol Neurosurgjournal_title
Clinical neurology and neurosurgeryauthors
Nwachuku EL,Puccio AM,Adeboye A,Chang YF,Kim J,Okonkwo DOdoi
10.1016/j.clineuro.2016.06.009subject
Has Abstractpub_date
2016-10-01 00:00:00pages
1-5eissn
0303-8467issn
1872-6968pii
S0303-8467(16)30222-0journal_volume
149pub_type
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journal_title:Clinical neurology and neurosurgery
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