Functioning and disability from 10 to 16 years after traumatic brain injury

Trajectories of Cognitive and Motor Functional Independence in Hispanic Individuals During the 10 yrs After Traumatic Brain Injury

OBJECTIVE

This study examined demographic and injury-related predictors of cognitive and motor functional independence in Hispanics with traumatic brain injury at years 1, 2, 5, and 10 after hospital discharge.

DESIGN

Hispanic participants ( n = 1360) from the TBI Model Systems Study were included if they had at least one Functional Independence Measure (FIM) Cognitive and Motor score at any time point (years 1, 2, 5, or 10). Hierarchical linear modeling was used to examine baseline predictors of FIM Cognitive and Motor trajectories across this period.

RESULTS

FIM Cognitive trajectories showed a quadratic movement (initial increase followed by a plateau or slight decrease), whereas FIM Motor trajectories showed a cubic movement (initial increase, followed by a plateau, then another increase). Higher FIM Cognitive trajectories were predicted by younger age, shorter length of posttraumatic amnesia, higher education, and having experienced a nonviolent mechanism of injury. Higher FIM Motor trajectories were predicted by younger age, shorter posttraumatic amnesia, and a nonviolent mechanism of injury.

CONCLUSIONS

The baseline predictors of functional trajectories identified may help create tailored, evidence-based rehabilitation interventions along the continuum of recovery during the first 10 yrs for Hispanics with traumatic brain injury at risk for reduced functional outcomes.

Cognitive Reserve, Early Cognitive Screening, and Relationship to Long-Term Outcome after Severe Traumatic Brain Injury

The objective was to investigate the relationship between early global cognitive functioning using the Barrow Neurological Institute Screen for Higher Cerebral Functions (BNIS) and cognitive flexibility (Trail Making Test (TMT), TMT B-A), with long-term outcome assessed by the Mayo-Portland Adaptability Index (MPAI-4) in severe traumatic brain injury (sTBI) controlling for the influence of cognitive reserve, age, and injury severity. Of 114 patients aged 18–65 with acute Glasgow Coma Scale 3–8, 41 patients were able to complete (BNIS) at 3 months after injury and MPAI-4 5–8 years after injury. Of these, 33 patients also completed TMT at 3 months. Global cognition and cognitive flexibility correlated significantly with long-term outcome measured with MPAI-4 total score (r_BNIS = 0.315; r_TMT = 0.355). Global cognition correlated significantly with the participation subscale (r = 0.388), while cognitive flexibility correlated with the adjustment (r = 0.364) and ability (r = 0.364) subscales. Adjusting for cognitive reserve and acute injury severity did not alter these relationships. The effect size for education on BNIS and TMT scores was large (d ≈ 0.85). Early screenings with BNIS and TMT are related to long-term outcome after sTBI and seem to measure complementary aspects of outcome. As early as 3 months after sTBI, educational level influences the scores on neuropsychological screening instruments.