Faculty Bibliography

OBJECTIVE: To determine the association between demographic, psychosocial, and injury-related characteristics and traumatic brain injury (TBI) occurring prior to a moderate or severe TBI requiring rehabilitation. DESIGN: Secondary data analysis. SETTING: TBI Model System inpatient rehabilitation facilities. PARTICIPANTS: Persons (N=4464) 1, 2, 5, 10, 15, or 20 years after TBI resulting in participation in the TBI Model System National Database. INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURES: History of TBI prior to the TBI Model System Index injury, pre-Index injury demographic and behavioral characteristics, Index injury characteristics, post-Index injury behavioral health and global outcome. RESULTS: Twenty percent of the cohort experienced TBIs preceding the TBI Model System Index injury-80% of these were mild and 40% occurred before age 16. Pre- and post-Index injury behavioral issues, especially substance abuse, were highly associated with having had a prior TBI. Greater severity of the pre-Index injury as well as occurrence before age 6 often showed stronger associations. Unexpectedly, pre-Index TBI was associated with less severe Index injuries and better functioning on admission and discharge from rehabilitation. CONCLUSIONS: Findings suggest that earlier life TBI may have important implications for rehabilitation after subsequent TBI, especially for anticipating behavioral health issues in the chronic stage of recovery. Results provide additional evidence for the potential consequences of early life TBI, even if mild.

There are no established biomarkers for mild traumatic brain injury (mTBI), in part because post-concussive symptoms (PCS) are subjective and conventional imaging is typically unremarkable. To test whether diffuse axonal abnormalities quantified with three-dimensional (3D) proton magnetic resonance spectroscopic imaging (1H-MRSI) correlated with patients' PCS, we retrospectively studied 26 mTBI patients (mean Glasgow Coma Scale score of 14.7), 18-56 years old, 3 - 55 days post injury and 13 controls. All were scanned at 3 Tesla with T1-and T2-weighted MRI and 3D 1H-MRSI (480 voxels over 360 cm3, ~30% of the brain). On scan day patients completed a symptom questionnaire and those indicating at least one of the most common acute/subacute mTBI symptoms (headache, dizziness, sleep disturbance, memory deficits, blurred vision) were grouped as PCS-positive. Global gray- and white matter (GM/WM) absolute concentrations of N-acetylaspartate (NAA), choline (Cho), creatine (Cr) and myo-inositol (mI) in the PCS-positive and PCS-negative patients were compared to age- and gender-matched controls using two-way analysis of variance. The results showed that the PCS-negative group (n=11) and controls (n=8) did not differ in any GM or WM metabolite level. The PCS-positive patients (n=15), however, had lower WM NAA than the controls (n=12): 7.0+/-0.6 mM (mean+/- standard deviation) versus 7.9+/-0.5mM (p=0.0007). Global WM NAA, therefore, showed sensitivity to the TBI sequelae associated with common PCS in individuals with mostly normal neuroimaging as well as GCS scores. This suggests a potential biomarker role in a patient population in which objective measures of injury and symptomatology are currently lacking.

This study examined possible cognitive correlates of hormonal neuroprotection following traumatic brain injury (TBI) using archival neuropsychological findings for 1563 individuals undergoing acute TBI rehabilitation between 1989 and 2002. Presumed age of menopause was based on the STRAW (Stages of Reproductive Aging) staging system (Soules, 2005; Soules et al., 2001) and general linear model (GLM) analysis of performance on neuropsychological testing by participants across gender and age groups (25-34, 35-44, 45-54, and 55-64) was performed. Hypotheses were (1) women with TBI in the oldest age group would have lower scores on neuropsychological tests and functional outcome measures than women in the younger groups, and (2) men in the oldest age group would have higher scores than women of the same age group. Analyses revealed that oldest females had significantly worse Trails B and SDMT written and oral scores than the youngest females. In addition, oldest females had significantly better Trails B, Rey AVLT and SDMT written scores than the oldest males. Possible cohort exposure to hormone replacement therapy, unknown hormonal status at time of testing, and sample-specific injury characteristics may have contributed to these findings.

OBJECTIVE: : To compare and contrast the levels of impairment, disability, and community participation of individuals with traumatic brain injury (TBI) with or without late posttraumatic seizures (LPTS). DESIGN: : Prospective survey study. SETTING: : Community. PARTICIPANTS: : Two groups of 91 individuals with TBI, with and without LPTS, were enrolled in the TBI Model Systems National Database between 1989 and 2002 and interviewed at years 1, 2, and 5 postinjury. INTERVENTIONS: : Not applicable. MAIN OUTCOME MEASURES: : Demographic, injury severity, productivity, and psychosocial outcomes. RESULTS: : The majority of the demographic and productivity outcomes up to 5 years postinjury were similar between individuals in the LPTS and non-LPTS groups. Both the LPTS and non-LPTS groups showed an increasing percentage of individuals who began to live alone after the first year postinjury and a decreasing percentage of individuals who were living with family members at 5 years postinjury compared with the first year post-TBI. A higher percentage of individuals in the LPTS group reported using more dependent forms of transportation such as riding with others or using public transportation. Individuals in the LPTS group had higher Disability Rating Scale scores at all time points, denoting greater functional disability, than individuals in the non-LPTS group, despite the 2 groups having similar Disability Rating Scale scores at discharge from rehabilitation. Satisfaction With Life Scale scores showed no changes over time but were significantly different between both groups at all time points, with individuals in the LPTS group reporting lower Satisfaction With Life Scale score than individuals in the non-LPTS group. CONCLUSIONS: : It does appear that the development of LPTS following a TBI is associated with poorer functional and psychosocial outcomes in the first 5 years after injury. It remains to be determined whether there are other factors that also may account for these differences and that may be amenable to intervention.

OBJECTIVE:: To investigate the psychometric properties of the Multidimensional Assessment of Fatigue (MAF) scale in a traumatic brain injury (TBI) sample. DESIGN:: Prospective survey study. SETTING:: Community. PARTICIPANTS:: One hundred sixty-seven individuals with TBI admitted for inpatient rehabilitation, enrolled into the TBI Model Systems national database, and followed up at either the first or second year postinjury. INTERVENTIONS:: Not applicable. MAIN OUTCOME MEASURE(S):: Multidimensional Assessment of Fatigue. RESULTS:: The initial analysis, using items 1 to 14, which are based on a 10-point rating scale, found that only 1 item ("walking") misfit the overall construct of fatigue in this TBI population. However, this 10-point rating scale was found to have disordered thresholds. When ratings were collapsed into 4 response categories, all MAF items used to calculate the Global Fatigue Index formed a unidimensional scale. CONCLUSION(S):: Findings generally support the unidimensionality of the MAF when used in a TBI population but call into question the use of a 10-point rating scale for items 1 to 14. Further study is needed to investigate the use of a 4-category rating scale across all items and the fit of the "walking" item for a measure of fatigue among individuals with TBI.

Dijkers MP, Bushnik T, Heinemann AW, Heller T, Libin AV, Starks J, Sherer M, Vandergoot D. Systematic reviews for informing rehabilitation practice: an introduction. The research literature that rehabilitation clinicians need to be familiar with has become too large for anyone to read, and numerous published studies are too complex for many practitioners to understand and fruitfully use. One method to keep up with new findings is through systematic reviews. Systematic reviews can be effective tools that help guide rehabilitation practice by identifying the best research that provides the evidence for enhanced clinical decision-making. This article describes how systematic reviews are created, indicates where rehabilitation clinicians may find them, and refers to a resource that may be of use in evaluating their quality and applicability.

Purpose: To disseminate findings from an international workshop regarding priority issues for girls' and women's health and quality-of-life after sustaining a traumatic brain injury (TBI). Methods: A workshop was held prior to the American Congress of Rehabilitation Medicine Conference 2010. The purpose of the workshop was to highlight the unique health issues experienced by women after a TBI, to identify research, education and policy gaps and to develop strategies to promote women's health. Presentations by researchers and consumers as well as large group discussions formed the basis of the recommendations. Results: Twenty researchers, clinicians, consumers and community agency personnel attended from five countries. Significant gaps in service provision in the community were identified as were unique issues for the short- and long-term effects on maturation and ageing, reproductive and sexual health, mental health and life satisfaction. The workshop led to the development of an international task force and recommendations for future directions. Conclusion: Women and girls experience unique outcomes after a TBI. The workshop identified research, policy, education and service priorities for the promotion of health and quality-of-life within this population.