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Item Adverse Outcome Following Mild Traumatic Brain Injury Is Associated with Microstructure Alterations at the Gray and White Matter Boundary(MDPI, 2023-08-21) Pankatz, Lara; Rojczyk, Philine; Seitz-Holland, Johanna; Bouix, Sylvain; Jung, Leonard B.; Wiegand, Tim L. T.; Bonke, Elena M.; Sollmann, Nico; Kaufmann, Elisabeth; Carrington, Holly; Puri, Twishi; Rathi, Yogesh; Coleman, Michael J.; Pasternak, Ofer; George, Mark S.; McAllister, Thomas W.; Zafonte, Ross; Stein, Murray B.; Marx, Christine E.; Shenton, Martha E.; Koerte, Inga K.; Psychiatry, School of MedicineThe gray matter/white matter (GM/WM) boundary of the brain is vulnerable to shear strain associated with mild traumatic brain injury (mTBI). It is, however, unknown whether GM/WM microstructure is associated with long-term outcomes following mTBI. The diffusion and structural MRI data of 278 participants between 18 and 65 years of age with and without military background from the Department of Defense INTRuST study were analyzed. Fractional anisotropy (FA) was extracted at the GM/WM boundary across the brain and for each lobe. Additionally, two conventional analytic approaches were used: whole-brain deep WM FA (TBSS) and whole-brain cortical thickness (FreeSurfer). ANCOVAs were applied to assess differences between the mTBI cohort (n = 147) and the comparison cohort (n = 131). Associations between imaging features and post-concussive symptom severity, and functional and cognitive impairment were investigated using partial correlations while controlling for mental health comorbidities that are particularly common among military cohorts and were present in both the mTBI and comparison group. Findings revealed significantly lower whole-brain and lobe-specific GM/WM boundary FA (p < 0.011), and deep WM FA (p = 0.001) in the mTBI cohort. Whole-brain and lobe-specific GM/WM boundary FA was significantly negatively correlated with post-concussive symptoms (p < 0.039), functional (p < 0.016), and cognitive impairment (p < 0.049). Deep WM FA was associated with functional impairment (p = 0.002). Finally, no significant difference was observed in cortical thickness, nor between cortical thickness and outcome (p > 0.05). Findings from this study suggest that microstructural alterations at the GM/WM boundary may be sensitive markers of adverse long-term outcomes following mTBI.Item Are Burns a Chronic Condition? Examining Patient Reported Outcomes up to 20 Years after Burn Injury – A Burn Model System National Database Investigation(Wolters Kluwer, 2022) Abouzeid, Cailin A.; Wolfe, Audrey E.; Ni, Pengsheng; Carrougher, Gretchen J.; Gibran, Nicole S.; Hammond, Flora M.; Holavanahalli, Radha; McMullen, Kara A.; Roaten, Kimberly; Suman, Oscar; Stewart, Barclay T.; Wolf, Steven; Zafonte, Ross; Kazis, Lewis E.; Ryan, Colleen M.; Schneider, Jeffrey C.; Physical Medicine and Rehabilitation, School of MedicineBackground: People living with burn injury often face long-term physical and psychological sequelae associated with their injuries. Few studies have examined the impacts of burn injuries on long-term health and function, life satisfaction, and community integration beyond 5 years postinjury. The purpose of this study was to examine these outcomes up to 20 years after burn injury. Methods: Data from the Burn Model System National Longitudinal Database (1993-2020) were analyzed. Patient-reported outcome measures were collected at discharge (preinjury status recall) and 5 years, 10 years, 15 years, and 20 years after injury. Outcomes examined were the SF-12/VR-12 Physical Component Summary and Mental Component Summary, Satisfaction with Life Scale, and Community Integration Questionnaire. Trajectories were developed using linear mixed models with repeated measures of outcome scores over time, controlling for demographic and clinical variables. Results: The study population included 421 adult burn survivors with a mean age of 42.4 years. Lower Physical Component Summary scores (worse health) were associated with longer length of hospital stay, older age at injury and greater time since injury. Similarly, lower Mental Component Summary scores were associated with longer length of hospital stay, female sex, and greater time since injury. Satisfaction with Life Scale scores decrease negatively over time. Lower Community Integration Questionnaire scores were associated with burn size and Hispanic/Latino ethnicity. Conclusion: Burn survivors' physical and mental health and satisfaction with life worsened over time up to 20 years after injury. Results strongly suggest that future studies should focus on long-term follow-up where clinical interventions may be necessary.Item Association of Sex and Age With Mild Traumatic Brain Injury-Related Symptoms: A TRACK-TBI Study(American Medical Association, 2021-04-01) Levin, Harvey S.; Temkin, Nancy R.; Barber, Jason; Nelson, Lindsay D.; Robertson, Claudia; Brennan, Jeffrey; Stein, Murray B.; Yue, John K.; Giacino, Joseph T.; McCrea, Michael A.; Diaz-Arrastia, Ramon; Mukherjee, Pratik; Okonkwo, David O.; Boase, Kim; Markowitz, Amy J.; Bodien, Yelena; Taylor, Sabrina; Vassar, Mary J.; Manley, Geoffrey T.; TRACK-TBI Investigators; Adeoye, Opeolu; Badjatia, Neeraj; Bullock, M. Ross; Chesnut, Randall; Corrigan, John D.; Crawford, Karen; Dikmen, Sureyya; Duhaime, Ann-Christine; Ellenbogen, Richard; Feeser, V. Ramana; Ferguson, Adam R.; Foreman, Brandon; Gardner, Raquel; Gaudette, Etienne; Gonzalez, Luis; Gopinath, Shankar; Gullapalli, Rao; Hemphill, J. Claude; Hotz, Gillian; Jain, Sonia; Keene, C. Dirk; Korley, Frederick K.; Kramer, Joel; Kreitzer, Natalie; Lindsell, Chris; Machamer, Joan; Madden, Christopher; Martin, Alastair; McAllister, Thomas; Merchant, Randall; Nolan, Amber; Ngwenya, Laura B.; Noel, Florence; Palacios, Eva; Puccio, Ava; Rabinowitz, Miri; Rosand, Jonathan; Sander, Angelle; Satris, Gabriella; Schnyer, David; Seabury, Seth; Sun, Xiaoying; Toga, Arthur; Valadka, Alex; Wang, Kevin; Yuh, Esther; Zafonte, Ross; Psychiatry, School of MedicineImportance: Knowledge of differences in mild traumatic brain injury (mTBI) recovery by sex and age may inform individualized treatment of these patients. Objective: To identify sex-related differences in symptom recovery from mTBI; secondarily, to explore age differences within women, who demonstrate poorer outcomes after TBI. Design, setting, and participants: The prospective cohort study Transforming Research and Clinical Knowledge in Traumatic Brain Injury (TRACK-TBI) recruited 2000 patients with mTBI from February 26, 2014, to July 3, 2018, and 299 patients with orthopedic trauma (who served as controls) from January 26, 2016, to July 27, 2018. Patients were recruited from 18 level I trauma centers and followed up for 12 months. Data were analyzed from August 19, 2020, to March 3, 2021. Exposures: Patients with mTBI (defined by a Glasgow Coma Scale score of 13-15) triaged to head computed tomography in 24 hours or less; patients with orthopedic trauma served as controls. Main outcomes and measures: Measured outcomes included (1) the Rivermead Post Concussion Symptoms Questionnaire (RPQ), a 16-item self-report scale that assesses postconcussion symptom severity over the past 7 days relative to preinjury; (2) the Posttraumatic Stress Disorder Checklist for the Diagnostic and Statistical Manual of Mental Disorders (Fifth Edition) (PCL-5), a 20-item test that measures the severity of posttraumatic stress disorder symptoms; (3) the Patient Health Questionnaire-9 (PHQ-9), a 9-item scale that measures depression based on symptom frequency over the past 2 weeks; and (4) the Brief Symptom Inventory-18 (BSI-18), an 18-item scale of psychological distress (split into Depression and Anxiety subscales). Results: A total of 2000 patients with mTBI (1331 men [67%; mean (SD) age, 41.0 (17.3) years; 1026 White (78%)] and 669 women [33%; mean (SD) age, 43.0 (18.5) years; 505 (76%) White]). After adjustment of multiple comparisons, significant TBI × sex interactions were observed for cognitive symptoms (B = 0.76; 5% false discovery rate-corrected P = .02) and somatic RPQ symptoms (B = 0.80; 5% false discovery rate-corrected P = .02), with worse symptoms in women with mTBI than men, but no sex difference in symptoms in control patients with orthopedic trauma. Within the female patients evaluated, there was a significant TBI × age interaction for somatic RPQ symptoms, which were worse in female patients with mTBI aged 35 to 49 years compared with those aged 17 to 34 years (B = 1.65; P = .02) or older than 50 years (B = 1.66; P = .02). Conclusions and relevance: This study found that women were more vulnerable than men to persistent mTBI-related cognitive and somatic symptoms, whereas no sex difference in symptom burden was seen after orthopedic injury. Postconcussion symptoms were also worse in women aged 35 to 49 years than in younger and older women, but further investigation is needed to corroborate these findings and to identify the mechanisms involved. Results suggest that individualized clinical management of mTBI should consider sex and age, as some women are especially predisposed to chronic postconcussion symptoms even 12 months after injury.Item Associations between neuropsychiatric and health status outcomes in individuals with probable mTBI(Elsevier, 2019-02) Bomyea, Jessica; Flashman, Laura A.; Zafonte, Ross; Andaluz, Norberto; Coimbra, Raul; George, Mark S.; Grant, Gerald A.; Marx, Christine E.; McAllister, Thomas W.; Shutter, Lori; Lang, Ariel J.; Stein, Murray B.; Psychiatry, School of MedicineMild traumatic brain injury (mTBI) is a common occurrence, and may impact distal outcomes in a subgroup of individuals. Improved characterization of health outcomes and identification of factors associated with poor outcomes is needed to better understand the impact of mTBI, particularly in those with co-occurring posttraumatic stress disorder (PTSD). Participants in a data repository of the Injury and Traumatic Stress (INTRuST) Clinical Consortium (n = 625) completed functional disability [FD] and health-related quality of life [HRQOL] questionnaires, and a subset completed a neuropsychological assessment. FD and HRQOL were compared among participants with probable mTBI (mTBI), probable mTBI with PTSD (mTBI/PTSD), and health comparison participants (HC). Associations between symptoms, neuropsychological performance, and health outcomes were examined in those with probable mTBI with and without PTSD (n = 316). Individuals in the mTBI/PTSD group endorsed poorer health outcomes than those in the mTBI group, who endorsed poorer outcomes than those in the HC group. Individuals in either mTBI group performed worse than those in the HC on verbal learning and memory and psychomotor speed. Health outcomes were correlated with mental health and postconcussive symptoms, as well as neuropsychological variables. mTBI may adversely impact self-reported health, with the greatest effect observed in individuals with co-occurring mTBI/PTSD.Item Effects of Statin Treatment on Outcomes after Traumatic Brain Injury(Liebert, 2018) Whyte, John; Ketchum, Jessica M.; Bogner, Jenny; Brunner, Robert C.; Hammond, Flora M.; Zafonte, Ross; Whiteneck, Gale G.; Weintraub, Alan; Physical Medicine and Rehabilitation, School of MedicineNeuroprotective treatments that have shown promise in reducing secondary injury and improving recovery in animal models of traumatic brain injury (TBI) have not been found effective to date in humans. One reason may be the delay after injury in initiating treatment. Statin medications are among the promising neuroprotective agents in animal models, and their presence in the bloodstream of many individuals at the time of injury might optimize their clinical impact. This observational study conducted by a subset of centers participating in the National Institute on Disability, Independent Living, and Rehabilitation Research (NIDILRR)-funded TBI Model System program sought to examine the effects of taking statin medication at the time injury on functional outcomes. Participants >50 years of age were prospectively enrolled during patient rehabilitation. Demographic data, cardiovascular history, and brain injury history were obtained through chart abstraction and interview. Prescription medication use in the year prior to enrollment was determined from a national pharmacy search service. Propensity scoring was used to create 49 pairs of participants who were well matched on demographic and clinical attributes but discordant for statin use. The treated and untreated participants did not differ on initial Glasgow Coma Score, time until commands were followed, duration of post-traumatic amnesia, or Functional Independence Measure (FIM) scores at rehabilitation admission, discharge, or 1 year post-injury, or on acute or rehabilitation hospital lengths of stay. Evidence of greater and lesser statin compliance was not associated with outcome. This study did not provide support for a clinically important benefit of statin use at the time of moderate to severe TBI.Item Functional Outcomes Over the First Year After Moderate to Severe Traumatic Brain Injury in the Prospective, Longitudinal TRACK-TBI Study(American Medical Association, 2021) McCrea, Michael A.; Giacino, Joseph T.; Barber, Jason; Temkin, Nancy R.; Nelson, Lindsay D.; Levin, Harvey S.; Dikmen, Sureyya; Stein, Murray; Bodien, Yelena G.; Boase, Kim; Taylor, Sabrina R.; Vassar, Mary; Mukherjee, Pratik; Robertson, Claudia; Diaz-Arrastia, Ramon; Okonkwo, David O.; Markowitz, Amy J.; Manley, Geoffrey T.; TRACK-TBI Investigators; Adeoye, Opeolu; Badjatia, Neeraj; Bullock, M. Ross; Chesnut, Randall; Corrigan, John D.; Crawford, Karen; Duhaime, Ann-Christine; Ellenbogen, Richard; Feeser, V. Ramana; Ferguson, Adam R.; Foreman, Brandon; Gardner, Raquel; Gaudette, Etienne; Goldman, Dana; Gonzalez, Luis; Gopinath, Shankar; Gullapalli, Rao; Hemphill, J. Claude; Hotz, Gillian; Jain, Sonia; Keene, C. Dirk; Korley, Frederick K.; Kramer, Joel; Kreitzer, Natalie; Lindsell, Chris; Machamer, Joan; Madden, Christopher; Martin, Alastair; McAllister, Thomas; Merchant, Randall; Ngwenya, Laura B.; Noel, Florence; Nolan, Amber; Palacios, Eva; Perl, Daniel; Puccio, Ava; Rabinowitz, Miri; Rosand, Jonathan; Sander, Angelle; Satris, Gabriella; Schnyer, David; Seabury, Seth; Sherer, Mark; Toga, Arthur; Valadka, Alex; Wang, Kevin; Yue, John K.; Yuh, Esther; Zafonte, Ross; Psychiatry, School of MedicineImportance: Moderate to severe traumatic brain injury (msTBI) is a major cause of death and disability in the US and worldwide. Few studies have enabled prospective, longitudinal outcome data collection from the acute to chronic phases of recovery after msTBI. Objective: To prospectively assess outcomes in major areas of life function at 2 weeks and 3, 6, and 12 months after msTBI. Design, setting, and participants: This cohort study, as part of the Transforming Research and Clinical Knowledge in TBI (TRACK-TBI) study, was conducted at 18 level 1 trauma centers in the US from February 2014 to August 2018 and prospectively assessed longitudinal outcomes, with follow-up to 12 months postinjury. Participants were patients with msTBI (Glasgow Coma Scale scores 3-12) extracted from a larger group of patients with mild, moderate, or severe TBI who were enrolled in TRACK-TBI. Data analysis took place from October 2019 to April 2021. Exposures: Moderate or severe TBI. Main outcomes and measures: The Glasgow Outcome Scale-Extended (GOSE) and Disability Rating Scale (DRS) were used to assess global functional status 2 weeks and 3, 6, and 12 months postinjury. Scores on the GOSE were dichotomized to determine favorable (scores 4-8) vs unfavorable (scores 1-3) outcomes. Neurocognitive testing and patient reported outcomes at 12 months postinjury were analyzed. Results: A total of 484 eligible patients were included from the 2679 individuals in the TRACK-TBI study. Participants with severe TBI (n = 362; 283 men [78.2%]; median [interquartile range] age, 35.5 [25-53] years) and moderate TBI (n = 122; 98 men [80.3%]; median [interquartile range] age, 38 [25-53] years) were comparable on demographic and premorbid variables. At 2 weeks postinjury, 36 of 290 participants with severe TBI (12.4%) and 38 of 93 participants with moderate TBI (41%) had favorable outcomes (GOSE scores 4-8); 301 of 322 in the severe TBI group (93.5%) and 81 of 103 in the moderate TBI group (78.6%) had moderate disability or worse on the DRS (total score ≥4). By 12 months postinjury, 142 of 271 with severe TBI (52.4%) and 54 of 72 with moderate TBI (75%) achieved favorable outcomes. Nearly 1 in 5 participants with severe TBI (52 of 270 [19.3%]) and 1 in 3 with moderate TBI (23 of 71 [32%]) reported no disability (DRS score 0) at 12 months. Among participants in a vegetative state at 2 weeks, 62 of 79 (78%) regained consciousness and 14 of 56 with available data (25%) regained orientation by 12 months. Conclusions and relevance: In this study, patients with msTBI frequently demonstrated major functional gains, including recovery of independence, between 2 weeks and 12 months postinjury. Severe impairment in the short term did not portend poor outcomes in a substantial minority of patients with msTBI. When discussing prognosis during the first 2 weeks after injury, clinicians should be particularly cautious about making early, definitive prognostic statements suggesting poor outcomes and withdrawal of life-sustaining treatment in patients with msTBI.Item Latent Profile Analysis of Neuropsychiatric Symptoms and Cognitive Function of Adults 2 Weeks After Traumatic Brain Injury: Findings From the TRACK-TBI Study(American Medical Association, 2021-03-01) Brett, Benjamin L.; Kramer, Mark D.; Whyte, John; McCrea, Michael A.; Stein, Murray B.; Giacino, Joseph T.; Sherer, Mark; Markowitz, Amy J.; Manley, Geoffrey T.; Nelson, Lindsay D.; TRACK-TBI Investigators; Adeoye, Opeolu; Badjatia, Neeraj; Boase, Kim; Barber, Jason; Bodien, Yelena; Bullock, M. Ross; Chesnut, Randall; Corrigan, John D.; Crawford, Karen; Diaz-Arrastia, Ramon; Dikmen, Sureyya; Duhaime, Ann-Christine; Ellenbogen, Richard; Feeser, V. Ramana; Ferguson, Adam R.; Foreman, Brandon; Gardner, Raquel; Gaudette, Etienne; Gonzalez, Luis; Gopinath, Shankar; Gullapalli, Rao; Hemphill, J. Claude; Hotz, Gillian; Jain, Sonia; Keene, C. Dirk; Korley, Frederick K.; Kramer, Joel; Kreitzer, Natalie; Levin, Harvey; Lindsell, Chris; Machamer, Joan; Madden, Christopher; Martin, Alastair; McAllister, Thomas; Merchant, Randall; Mukherjee, Pratik; Ngwenya, Laura B.; Noel, Florence; Okonkwo, David; Palacios, Eva; Puccio, Ava; Rabinowitz, Miri; Robertson, Claudia; Rosand, Jonathan; Sander, Angelle; Satris, Gabriella; Schnyer, David; Seabury, Seth; Taylor, Sabrina; Temkin, Nancy; Toga, Arthur; Valadka, Alex; Vassar, Mary; Wang, Kevin; Yue, John K.; Yuh, Esther; Zafonte, Ross; Psychiatry, School of MedicineImportance: Heterogeneity across patients with traumatic brain injury (TBI) presents challenges for clinical care and intervention design. Identifying distinct clinical phenotypes of TBI soon after injury may inform patient selection for precision medicine clinical trials. Objective: To investigate whether distinct neurobehavioral phenotypes can be identified 2 weeks after TBI and to characterize the degree to which early neurobehavioral phenotypes are associated with 6-month outcomes. Design, setting, and participants: This prospective cohort study included patients presenting to 18 US level 1 trauma centers within 24 hours of TBI from 2014 to 2019 as part of the Transforming Research and Clinical Knowledge in TBI (TRACK-TBI) study. Data were analyzed from January 28, 2020, to January 11, 2021. Exposures: TBI. Main outcomes and measures: Latent profiles (LPs) were derived from common dimensions of neurobehavioral functioning at 2 weeks after injury, assessed through National Institutes of Health TBI Common Data Elements (ie, Brief Symptom Inventory-18, Patient Health Questionnaire-9 Depression checklist, Posttraumatic Stress Disorder Checklist for DSM-5, PROMIS Pain Intensity scale, Insomnia Severity Index, Rey Auditory Verbal Learning Test, Wechsler Adult Intelligence Scale-Fourth Edition Coding and Symbol Search subtests, Trail Making Test, and NIH Toolbox Cognitive Battery Pattern Comparison Processing Speed, Dimensional Change Card Sort, Flanker Inhibitory Control and Attention, and Picture Sequence Memory subtests). Six-month outcomes were the Satisfaction With Life Scale (SWLS), Quality of Life after Brain Injury-Overall Scale (QOLIBRI-OS), Glasgow Outcome Scale-Extended (GOSE), and Rivermead Post-Concussion Symptoms Questionnaire (RPQ). Results: Among 1757 patients with TBI included, 1184 (67.4%) were men, and the mean (SD) age was 39.9 (17.0) years. LP analysis revealed 4 distinct neurobehavioral phenotypes at 2 weeks after injury: emotionally resilient (419 individuals [23.8%]), cognitively impaired (368 individuals [20.9%]), cognitively resilient (620 individuals [35.3%]), and neuropsychiatrically distressed (with cognitive weaknesses; 350 individuals [19.9%]). Adding LP group to models including demographic characteristics, medical history, Glasgow Coma Scale score, and other injury characteristics was associated with significantly improved estimation of association with 6-month outcome (GOSE R2 increase = 0.09-0.19; SWLS R2 increase = 0.12-0.22; QOLIBRI-OS R2 increase = 0.14-0.32; RPQ R2 = 0.13-0.34). Conclusions and relevance: In this cohort study of patients with TBI presenting to US level-1 trauma centers, qualitatively distinct profiles of symptoms and cognitive functioning were identified at 2 weeks after TBI. These distinct phenotypes may help optimize clinical decision-making regarding prognosis, as well as selection and stratification for randomized clinical trials.Item Pathological Computed Tomography Features Associated With Adverse Outcomes After Mild Traumatic Brain Injury(American Medical Association, 2021) Yuh, Esther L.; Jain, Sonia; Sun, Xiaoying; Pisică, Dana; Harris, Mark H.; Taylor, Sabrina R.; Markowitz, Amy J.; Mukherjee, Pratik; Verheyden, Jan; Giacino, Joseph T.; Levin, Harvey S.; McCrea, Michael; Stein, Murray B.; Temkin, Nancy R.; Diaz-Arrastia, Ramon; Robertson, Claudia S.; Lingsma, Hester F.; Okonkwo, David O.; Maas, Andrew I. R.; Manley, Geoffrey T.; TRACK-TBI Investigators for the CENTER-TBI Investigators; Adeoye, Opeolu; Badjatia, Neeraj; Boase, Kim; Bodien, Yelena; Corrigan, John D.; Crawford, Karen; Dikmen, Sureyya; Duhaime, Ann-Christine; Ellenbogen, Richard; Feeser, V. Ramana; Ferguson, Adam R.; Foreman, Brandon; Gardner, Raquel; Gaudette, Etienne; Gonzalez, Luis; Gopinath, Shankar; Gullapalli, Rao; Hemphill, J. Claude; Hotz, Gillian; Keene, C. Dirk; Kramer, Joel; Kreitzer, Natalie; Lindsell, Chris; Machamer, Joan; Madden, Christopher; Martin, Alastair; McAllister, Thomas; Merchant, Randall; Nelson, Lindsay; Ngwenya, Laura B.; Noel, Florence; Nolan, Amber; Palacios, Eva; Perl, Daniel; Rabinowitz, Miri; Rosand, Jonathan; Sander, Angelle; Satris, Gabriella; Schnyer, David; Seabury, Seth; Toga, Arthur; Valadka, Alex; Vassar, Mary; Zafonte, Ross; Psychiatry, School of MedicineImportance: A head computed tomography (CT) with positive results for acute intracranial hemorrhage is the gold-standard diagnostic biomarker for acute traumatic brain injury (TBI). In moderate to severe TBI (Glasgow Coma Scale [GCS] scores 3-12), some CT features have been shown to be associated with outcomes. In mild TBI (mTBI; GCS scores 13-15), distribution and co-occurrence of pathological CT features and their prognostic importance are not well understood. Objective: To identify pathological CT features associated with adverse outcomes after mTBI. Design, setting, and participants: The longitudinal, observational Transforming Research and Clinical Knowledge in Traumatic Brain Injury (TRACK-TBI) study enrolled patients with TBI, including those 17 years and older with GCS scores of 13 to 15 who presented to emergency departments at 18 US level 1 trauma centers between February 26, 2014, and August 8, 2018, and underwent head CT imaging within 24 hours of TBI. Evaluations of CT imaging used TBI Common Data Elements. Glasgow Outcome Scale-Extended (GOSE) scores were assessed at 2 weeks and 3, 6, and 12 months postinjury. External validation of results was performed via the Collaborative European NeuroTrauma Effectiveness Research in Traumatic Brain Injury (CENTER-TBI) study. Data analyses were completed from February 2020 to February 2021. Exposures: Acute nonpenetrating head trauma. Main outcomes and measures: Frequency, co-occurrence, and clustering of CT features; incomplete recovery (GOSE scores <8 vs 8); and an unfavorable outcome (GOSE scores <5 vs ≥5) at 2 weeks and 3, 6, and 12 months. Results: In 1935 patients with mTBI (mean [SD] age, 41.5 [17.6] years; 1286 men [66.5%]) in the TRACK-TBI cohort and 2594 patients with mTBI (mean [SD] age, 51.8 [20.3] years; 1658 men [63.9%]) in an external validation cohort, hierarchical cluster analysis identified 3 major clusters of CT features: contusion, subarachnoid hemorrhage, and/or subdural hematoma; intraventricular and/or petechial hemorrhage; and epidural hematoma. Contusion, subarachnoid hemorrhage, and/or subdural hematoma features were associated with incomplete recovery (odds ratios [ORs] for GOSE scores <8 at 1 year: TRACK-TBI, 1.80 [95% CI, 1.39-2.33]; CENTER-TBI, 2.73 [95% CI, 2.18-3.41]) and greater degrees of unfavorable outcomes (ORs for GOSE scores <5 at 1 year: TRACK-TBI, 3.23 [95% CI, 1.59-6.58]; CENTER-TBI, 1.68 [95% CI, 1.13-2.49]) out to 12 months after injury, but epidural hematoma was not. Intraventricular and/or petechial hemorrhage was associated with greater degrees of unfavorable outcomes up to 12 months after injury (eg, OR for GOSE scores <5 at 1 year in TRACK-TBI: 3.47 [95% CI, 1.66-7.26]). Some CT features were more strongly associated with outcomes than previously validated variables (eg, ORs for GOSE scores <5 at 1 year in TRACK-TBI: neuropsychiatric history, 1.43 [95% CI .98-2.10] vs contusion, subarachnoid hemorrhage, and/or subdural hematoma, 3.23 [95% CI 1.59-6.58]). Findings were externally validated in 2594 patients with mTBI enrolled in the CENTER-TBI study. Conclusions and relevance: In this study, pathological CT features carried different prognostic implications after mTBI to 1 year postinjury. Some patterns of injury were associated with worse outcomes than others. These results support that patients with mTBI and these CT features need TBI-specific education and systematic follow-up.Item Predictive utility of an adapted Marshall head CT classification scheme after traumatic brain injury(Taylor & Francis, 2019-01-19) Brown, Allen W.; Pretz, Christopher R.; Bell, Kathleen R.; Hammond, Flora M.; Arciniegas, David B.; Bodien, Yelena G.; Dams-O’Connor, Kristen; Giacino, Joseph T.; Hart, Tessa; Johnson-Greene, Douglas; Kowalski, Robert G.; Walker, William C.; Weintraub, Alan; Zafonte, Ross; Physical Medicine and Rehabilitation, School of MedicineObjective: To study the predictive relationship among persons with traumatic brain injury (TBI) between an objective indicator of injury severity (the adapted Marshall computed tomography [CT] classification scheme) and clinical indicators of injury severity in the acute phase, functional outcomes at inpatient rehabilitation discharge, and functional and participation outcomes at 1 year after injury, including death.Participants: The sample involved 4895 individuals who received inpatient rehabilitation following acute hospitalization for TBI and were enrolled in the Traumatic Brain Injury Model Systems National Database between 1989 and 2014.Design: Head CT variables for each person were fit into adapted Marshall CT classification categories I through IV.Main Measures: Prediction models were developed to determine the amount of variability explained by the CT classification categories compared with commonly used predictors, including a clinical indicator of injury severity.Results: The adapted Marshall classification categories aided only in the prediction of craniotomy or craniectomy during acute hospitalization, otherwise making no meaningful contribution to variance in the multivariable models predicting outcomes at any time point after injury.Conclusion: Results suggest that head CT findings classified in this manner do not inform clinical discussions related to functional prognosis or rehabilitation planning after TBI.Item Prevalence of suicidal behaviour following traumatic brain injury: Longitudinal follow-up data from the NIDRR Traumatic Brain Injury Model Systems(Taylor & Francis, 2016) Fisher, Lauren B.; Pedrelli, Paola; Iverson, Grant L.; Bergquist, Thomas F.; Bombardier, Charles H.; Hammond, Flora M.; Hart, Tessa; Ketchum, Jessica M.; Giacino, Joseph; Zafonte, Ross; Department of Physical Medicine and Rehabilitation, IU School of MedicineObjective: This study utilized the Traumatic Brain Injury Model Systems (TBIMS) National Database to examine the prevalence of depression and suicidal behaviour in a large cohort of patients who sustained moderate-to-severe TBI. Method: Participants presented to a TBIMS acute care hospital within 72 hours of injury and received acute care and comprehensive rehabilitation in a TBIMS designated brain injury inpatient rehabilitation programme. Depression and suicidal ideation were measured with the Patient Health Questionnaire (PHQ-9). Self-reported suicide attempts during the past year were recorded at each follow-up examination, at 1, 2, 3, 10, 15 and 20 years post-injury. Results: Throughout the 20 years of follow-up, rates of depression ranged from 24.8–28.1%, suicidal ideation ranged from 7.0–10.1% and suicide attempts (past year) ranged from 0.8–1.7%. Participants who endorsed depression and/or suicidal behaviour at year 1 demonstrated consistently elevated rates of depression and suicidal behaviour 5 years after TBI. Conclusion: Compared to the general population, individuals with TBI are at greater risk for depression and suicidal behaviour many years after TBI. The significant psychiatric symptoms evidenced by individuals with TBI highlight the need for routine screening and mental health treatment in this population.