Postconcussive symptom report in polytrauma: influence of mild traumatic brain injury and psychiatric distress

Many studies have evaluated the influence of mild traumatic brain injury (mTBI) on neuropsychological test performance and on report of postconcussive symptoms. However, most studies that examine postconcussion syndrome (PCS) do not address the issue of "polytrauma," which is common in military mTBI. This study investigated simultaneously demographic, injury-related, and psychiatric symptom predictors of PCS report in a veteran, polytrauma sample. In prediction of overall report of PCS symptoms with demographic, traumatic brain injury, psychiatric and sleep variables, 60% of the variance was explained. Semipartial correlations revealed that post-traumatic stress disorder uniquely explained 7% of the variance, depression 2%, and sleep dissatisfaction 3%; injury and demographic characteristics accounted for no unique variance. In all 5 hierarchical multiple regressions (prediction of total Neurobehavioral Symptom Inventory score and 4 individual factor scores), the total models were significant (p < 0.001). Accurate diagnosis and treatment necessitates an integrative analysis of PCS, psychiatric, behavioral, and health symptom report in addition to neuropsychological functioning in the polytrauma population. This study demonstrated that emotional distress was uniquely predictive of total report of PCS and that no injury-related characteristics were predictive. This is of particular relevance in a Veteran population given the high rates of both mTBI and psychiatric disturbance.