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-100β, 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-100β, NSE and MBP levels were significantly higher in TBI subjects than in control subjects ( P<0.001 for S-100β and NSE; P=0.009 for MBP). Initial S-100β 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 ( P=0.022 ). MBP levels were higher in TBI subjects with positive findings on the baseline CT scan than in CT-negative subjects ( P=0.007 ).Conclusions. S-100β, NSE and MBP may be present in the sera of TBI subjects in elevated quantities relative to controls. S-100β may aid in predicting short-term outcome in TBI subjects.