The early cognitive effects from a mild traumatic brain injury (mTBI) are poorly understood in youth. The aim of this study was to examine acute neurocognitive functioning in children and adolescents who presented to the emergency department (ED) after an mTBI. Youth 8-17 years of age with an mTBI (n=77; mean age, 13.6 years; 95% confidence interval [CI], 13.0-14.2) and an orthopedic injury control (OIC) group (n=28; mean age, 13.9 years; 95% CI, 13.1-14.7) underwent a very brief computerized neurocognitive assessment (four subtests from CNS Vital Signs) in a pediatric trauma hospital ED. The mTBI and OIC groups were not significantly different on age, gender, handedness, computer familiarity, race, median family income, pain rating scales, or time from injury to assessment. There were no significant differences between the mTBI and OIC groups for accuracy on immediate memory, delayed memory, and measures of attention and executive functioning. However, the mTBI group performed significantly worse than the OIC on nearly all measures of psychomotor speed and reaction time. Further, cognitive functioning appears to worsen as more time passes since the mTBI. Neurocognitive deficits are detectable in youth with an mTBI who present to the ED, despite having a Glasgow Coma Scale score of 15/15 and normal neuroimaging (or their presentation does not warrant neuroimaging). Their profile appears to include preserved accuracy on cognitive measures, but at the expense of slower psychomotor speed and longer reaction time.

Cognitive abilities can be acutely disrupted in children and adolescents who sustain a mild traumatic brain injury (mTBI), with the potential that these disruptions may be predictive of recovery. The objective of this study was to determine if cognitive abilities in the emergency department (ED) can differentiate and predict poor symptom recovery following a pediatric mTBI. Participants included 77 male and female youth with a mTBI (mean age=13.6; SD=2.6). All participants completed computerized cognitive testing (four subtests from the CNS Vital Signs) when they presented to the ED. Symptom measurement occurred in the ED (for pre-injury), at 7-10 days, 1 month, 2 months, and 3 months post-mTBI using the post-concussion symptom inventory (PCSI). Recovery was determined using reliable change scores for symptom ratings from 28 orthopedic injury controls (mean age=13.9 years; SD=2.1). Significantly worse Reaction Time scores (i.e., rapid information processing) in the ED were found in those who remained symptomatic at 1 month. Performances on the Reaction Time and Cognitive Flexibility domain scores were predictive of symptom outcome at 1 month for youth (above and beyond sex and baseline symptom burden). Youth with low scores on Reaction Time and/or Cognitive Flexibility were nearly 15 times (95% CI=1.8-323.5) more likely to remain symptomatic at 1 month post-mTBI. No significant group differences were found at 7-10 days, 2 months, or 3 months post-injury. Rapid computerized cognitive testing in the ED following a mTBI may help clinicians predict which youth may or may not remain symptomatic at follow-up.

Rest is commonly prescribed following a mild traumatic brain injury (mTBI). There is concern that cognitive exertion by an acutely or sub-acutely injured brain may negatively alter outcome. The objective of this study was to determine if computerized cognitive testing in the emergency department alters symptom outcome from mTBI. Participants included 77 youth with mTBI who underwent computerized cognitive testing (mean age, 13.6; 95% confidence interval [CI] = 13.0-14.2) and were matched to 77 youth with mTBI who did not participate in cognitive testing (mean age, 13.5; 95% CI = 12.9-14.0). Participants who underwent cognitive testing did not differ from those who did not undergo acute cognitive testing on mean symptom ratings or the proportion who were not recovered at 7-10 days, 1 month, 2 months, or 3 months. There also was no difference in symptom outcome for those who underwent a shortened (four subtests, mean time = 16 min) or full-length (seven subtests, mean time = 28 min) version of the computerized test. Brief cognitive exertion using a computerized cognitive assessment after mTBI in youth does not result in worse symptoms at these follow-up periods, does not prolong symptom recovery, should not be considered contraindicated to recovery, and could be considered as another tool to aid in the management of these injuries. Further research with different samples is warranted.

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