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  • Title: Tau proteins in serum predict outcome after severe traumatic brain injury.
    Author: Liliang PC, Liang CL, Weng HC, Lu K, Wang KW, Chen HJ, Chuang JH.
    Journal: J Surg Res; 2010 May 15; 160(2):302-7. PubMed ID: 19345376.
    Abstract:
    BACKGROUND: The identification of reliable outcome predictors after traumatic brain injury (TBI) is crucial. The objective of our study was to investigate the role of tau protein as a serum marker of TBI. METHODS: Thirty-four patients with severe TBI (Glasgow Coma Scale [GCS] score at admission <or= 8) were considered. The tau protein level in the blood samples obtained at the time of admission was measured. The outcome was assessed by using the Glasgow Outcome Scale (GOS) at 6 mo post-injury. Demographic, clinical, and laboratory variables were analyzed to study their effect on the outcome. RESULTS: tau Protein levels were higher in the poor outcome group (436.2 +/- 473.6 pg/mL) than in the good outcome group (51.6 +/- 81.5 pg/mL) (P < 0.0001). Univariate analyses demonstrated that poor outcome was significantly associated with a poor GCS score (P = 0.001), higher serum tau protein levels (P < 0.001), abnormal pupil light reflex (P = 0.013), and basal cistern compression on computed tomogram (CT) (P = 0.026). Multivariate analyses revealed that a poor GCS score (P = 0.049) and higher serum tau protein levels (P = 0.043) were independent prognostic factors for poor outcome. The receiver-operating characteristic (ROC) curve demonstrated that a tau protein level >or= 114.5 pg/mL yielded 88% sensitivity and 94% specificity for predicting a poor outcome. CONCLUSIONS: These results suggest that in addition to GCS; serum tau protein levels may serve as indicators for the prediction of outcome following severe TBI. However; it should be viewed with caution because of the small sample size and wide standard deviations.
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