Serum Levels of Biochemical Markers of Traumatic Brain Injury

Background. A biomarker would be valuable in the diagnosis, risk stratification and prognosis of patients with traumatic brain injury (TBI). Methods. We measured serum levels of S-100 β, neuron specific enolase (NSE) and myelin basic protein (MBP) in 50 TBI subjects, and 50 age and gender matched controls. Patients were recruited within 6 hours of the initial injury, they had an initial Glasgow Coma Scale (GCS) score of 14 or less, or a GCS score of 15 with witnessed loss of consciousness (LOC) or amnesia. Results. S-100 β, NSE and MBP levels were significantly higher in TBI subjects than in control subjects ( 0 . 0 0 1 for S-100 β and NSE; = 0 . 0 0 9 for MBP). Initial S-100 β levels were significantly higher in TBI subjects who had not retuned to normal activities 2 weeks following their injury than in TBI subjects who had retuned to normal activities ( = 0 . 0 2 2 ). MBP levels were higher in TBI subjects with positive findings on the baseline CT scan than in CT-negative subjects ( = 0 . 0 0 7 ). Conclusions. S-100 β, NSE and MBP may be present in the sera of TBI subjects in elevated quantities relative to controls. S-100 β may aid in predicting short-term outcome in TBI subjects.