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Acute elevation of serum inflammatory markers predicts symptom recovery after concussion. Neurology 2019 Jul 30;93(5):e497-e507

Date

07/05/2019

Pubmed ID

31270219

Pubmed Central ID

PMC6693429

DOI

10.1212/WNL.0000000000007864

Scopus ID

2-s2.0-85070790001

Abstract

OBJECTIVE: To test the hypothesis that acute elevations in serum inflammatory markers predict symptom recovery after sport-related concussion (SRC).

METHODS: High school and collegiate football players (n = 857) were prospectively enrolled. Forty-one athletes with concussion and 43 matched control athletes met inclusion criteria. Serum levels of interleukin (IL)-6, IL-1β, IL-10, tumor necrosis factor, C-reactive protein, interferon-γ, and IL-1 receptor antagonist and Sport Concussion Assessment Tool, 3rd edition (SCAT3) symptom severity scores were collected at a preinjury baseline, 6 and 24-48 hours postinjury, and approximately 8, 15, and 45 days following concussion. The number of days that athletes were symptomatic following SRC (i.e., duration of symptoms) was the primary outcome variable.

RESULTS: IL-6 and IL-1RA were significantly elevated in athletes with concussion at 6 hours relative to preinjury and other postinjury visits, as well as compared to controls ( ≤ 0.001). IL-6 and IL-1RA significantly discriminated concussed from control athletes at 6 hours postconcussion (IL-6 area under receiver operating characteristic curve 0.79 [95% confidence interval (CI) 0.65-0.92], IL-1RA AUC 0.79 [95% CI 0.67-0.90]). Further, IL-6 levels at 6 hours postconcussion were significantly associated with the duration of symptoms (hazard ratio for symptom recovery = 0.61 [95% CI 0.38-0.96], = 0.031).

CONCLUSIONS: Results support the potential utility of IL-6 and IL-1RA as serum biomarkers of SRC and demonstrate the potential of these markers in identifying athletes at risk for prolonged recovery after SRC.

CLASSIFICATION OF EVIDENCE: This study provides Class III evidence that serum levels of IL-6 and IL-1RA 6 hours postconcussion significantly discriminated concussed from control athletes.

Author List

Nitta ME, Savitz J, Nelson LD, Teague TK, Hoelzle JB, McCrea MA, Meier TB

Authors

Michael McCrea PhD Professor in the Neurosurgery department at Medical College of Wisconsin
Timothy B. Meier PhD Associate Professor in the Neurosurgery department at Medical College of Wisconsin
Lindsay D. Nelson PhD Associate Professor in the Neurosurgery department at Medical College of Wisconsin




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