COMT Val 158 Met polymorphism is associated with nonverbal cognition following mild traumatic brain injury

Mild traumatic brain injury (mTBI) results in variable clinical outcomes, which may be influenced by genetic variation. A single-nucleotide polymorphism in catechol-o-methyltransferase (COMT), an enzyme which degrades catecholamine neurotransmitters, may influence cognitive deficits following moderate and/or severe head trauma. However, this has been disputed, and its role in mTBI has not been studied. Here, we utilize the Transforming Research and Clinical Knowledge in Traumatic Brain Injury Pilot (TRACK-TBI Pilot) study to investigate whether the COMT Val (158) Met polymorphism influences outcome on a cognitive battery 6 months following mTBI--Wechsler Adult Intelligence Test Processing Speed Index Composite Score (WAIS-PSI), Trail Making Test (TMT) Trail B minus Trail A time, and California Verbal Learning Test, Second Edition Trial 1-5 Standard Score (CVLT-II). All patients had an emergency department Glasgow Coma Scale (GCS) of 13-15, no acute intracranial pathology on head CT, and no polytrauma as defined by an Abbreviated Injury Scale (AIS) score of ≥3 in any extracranial region. Results in 100 subjects aged 40.9 (SD 15.2) years (COMT Met (158) /Met (158) 29 %, Met (158) /Val (158) 47 %, Val (158) /Val (158) 24 %) show that the COMT Met (158) allele (mean 101.6 ± SE 2.1) associates with higher nonverbal processing speed on the WAIS-PSI when compared to Val (158) /Val (158) homozygotes (93.8 ± SE 3.0) after controlling for demographics and injury severity (mean increase 7.9 points, 95 % CI [1.4 to 14.3], p = 0.017). The COMT Val (158) Met polymorphism did not associate with mental flexibility on the TMT or with verbal learning on the CVLT-II. Hence, COMT Val (158) Met may preferentially modulate nonverbal cognition following uncomplicated mTBI.Registry: ClinicalTrials.gov Identifier NCT01565551.

Venlafaxine extended-release for depression following spinal cord injury: a randomized clinical trial

IMPORTANCE

Depression is prevalent and associated with negative outcomes in individuals with spinal cord injury (SCI). Antidepressants are used routinely to treat depression, yet no placebo-controlled trials have been published in this population to our knowledge.

OBJECTIVE

To determine the efficacy and tolerability of venlafaxine hydrochloride extended-release (XR) for major depressive disorder (MDD) or dysthymic disorder in persons with chronic SCI.

DESIGN, SETTING, AND PARTICIPANTS

Multisite, randomized (1:1), double-blind, placebo-controlled Project to Improve Symptoms and Mood After SCI (PRISMS) trial. All research staff conducting screening, intervention, and outcome procedures were blinded to randomization status. We screened 2536 patients from outpatient clinics at 6 SCI treatment centers in the United States and randomized 133 participants into the trial. Participants were 18 to 64 years old and at least 1 month after SCI, with MDD or dysthymic disorder. Seventy-four percent of participants were male, and participants were on average 40 years old and 11 years after SCI. Forty-seven percent had cervical injuries, 53.4% had American Spinal Injury Association injury severity A (complete injury) SCI, 24.1% had at least 2 prior MDD episodes, and 99.2% had current MDD. Common comorbidities included chronic pain (93.9%), significant anxiety (57.1%), and history of substance dependence (44.4%).

INTERVENTIONS

Twelve-week trial of venlafaxine XR vs placebo using a flexible-dose algorithm.

MAIN OUTCOMES AND MEASURES

The Hamilton Depression Rating Scale (HAM-D 17-item version and Maier subscale, which focuses on core depression symptoms and excludes somatic symptoms) over 12 weeks.

RESULTS

Mixed-effects models revealed a significant difference between the venlafaxine XR and placebo groups in improvement on the Maier subscale from baseline to 12 weeks (treatment effect, 1.6; 95% CI, 0.3-2.9; P = .02) but not on the HAM-D 17-item version (treatment effect, 1.0; 95% CI, -1.4 to 3.4; P = .42). Participants receiving venlafaxine XR reported significantly less SCI-related disability on the Sheehan Disability Scale at 12 weeks compared with placebo (treatment effect, 4.7; 95% CI, 1.5-7.8; P = .005). Blurred vision was the only significantly more common new or worsening adverse effect in the venlafaxine XR group compared with the placebo group over 12 weeks.

CONCLUSIONS AND RELEVANCE

Venlafaxine XR was well tolerated by most patients and an effective antidepressant for decreasing core symptoms of depression and improving SCI-related disability. Further research is needed to determine the optimal treatment and measurement approaches for depression in chronic SCI.

TRIAL REGISTRATION

clinicaltrials.gov Identifier: NCT00592384.

Comparative study of outcome measures and analysis methods for traumatic brain injury trials

Batteries of functional and cognitive measures have been proposed as alternatives to the Extended Glasgow Outcome Scale (GOSE) as the primary outcome for traumatic brain injury (TBI) trials. We evaluated several approaches to analyzing GOSE and a battery of four functional and cognitive measures. Using data from a randomized trial, we created a "super" dataset of 16,550 subjects from patients with complete data (n=331) and then simulated multiple treatment effects across multiple outcome measures. Patients were sampled with replacement (bootstrapping) to generate 10,000 samples for each treatment effect (n=400 patients/group). The percentage of samples where the null hypothesis was rejected estimates the power. All analytic techniques had appropriate rates of type I error (≤5%). Accounting for baseline prognosis either by using sliding dichotomy for GOSE or using regression-based methods substantially increased the power over the corresponding analysis without accounting for prognosis. Analyzing GOSE using multivariate proportional odds regression or analyzing the four-outcome battery with regression-based adjustments had the highest power, assuming equal treatment effect across all components. Analyzing GOSE using a fixed dichotomy provided the lowest power for both unadjusted and regression-adjusted analyses. We assumed an equal treatment effect for all measures. This may not be true in an actual clinical trial. Accounting for baseline prognosis is critical to attaining high power in Phase III TBI trials. The choice of primary outcome for future trials should be guided by power, the domain of brain function that an intervention is likely to impact, and the feasibility of collecting outcome data.

Association of a common genetic variant within ANKK1 with six-month cognitive performance after traumatic brain injury

Genetic association analyses suggest that certain common single nucleotide polymorphisms (SNPs) may adversely impact recovery from traumatic brain injury (TBI). Delineating their causal relationship may aid in development of novel interventions and in identifying patients likely to respond to targeted therapies. We examined the influence of the (C/T) SNP rs1800497 of ANKK1 on post-TBI outcome using data from two prospective multicenter studies: the Citicoline Brain Injury Treatment (COBRIT) trial and Transforming Research and Clinical Knowledge in Traumatic Brain Injury Pilot (TRACK-TBI Pilot). We included patients with ANKK1 genotyping results and cognitive outcomes at six months post-TBI (n = 492: COBRIT n = 272, TRACK-TBI Pilot n = 220). Using the California Verbal Learning Test Second Edition (CVLT-II) Trial 1-5 Standard Score, we found a dose-dependent effect for the T allele, with T/T homozygotes scoring lowest on the CVLT-II Trial 1-5 Standard Score (T/T 45.1, C/T 51.1, C/C 52.1, ANOVA, p = 0.008). Post hoc testing with multiple comparison-correction indicated that T/T patients performed significantly worse than C/T and C/C patients. Similar effects were observed in a test of non-verbal processing (Wechsler Adult Intelligence Scale, Processing Speed Index). Our findings extend those of previous studies reporting a negative relationship of the ANKK1 T allele with cognitive performance after TBI. In this study, we demonstrate the value of pooling shared clinical, biomarker, and outcome variables from two large datasets applying the NIH TBI Common Data Elements. The results have implications for future multicenter investigations to further elucidate the role of ANKK1 in post-TBI outcome.

Optimized methods for epilepsy therapy development using an etiologically realistic model of focal epilepsy in the rat

Conventionally developed antiseizure drugs fail to control epileptic seizures in about 30% of patients, and no treatment prevents epilepsy. New etiologically realistic, syndrome-specific epilepsy models are expected to identify better treatments by capturing currently unknown ictogenic and epileptogenic mechanisms that operate in the corresponding patient populations. Additionally, the use of electrocorticography permits better monitoring of epileptogenesis and the full spectrum of acquired seizures, including focal nonconvulsive seizures that are typically difficult to treat in humans. Thus, the combined use of etiologically realistic models and electrocorticography may improve our understanding of the genesis and progression of epilepsy, and facilitate discovery and translation of novel treatments. However, this approach is labor intensive and must be optimized. To this end, we used an etiologically realistic rat model of posttraumatic epilepsy, in which the initiating fluid percussion injury closely replicates contusive closed-head injury in humans, and has been adapted to maximize epileptogenesis and focal non-convulsive seizures. We obtained week-long 5-electrode electrocorticography 1 month post-injury, and used a Monte-Carlo-based non-parametric bootstrap strategy to test the impact of electrode montage design, duration-based seizure definitions, group size and duration of recordings on the assessment of posttraumatic epilepsy, and on statistical power to detect antiseizure and antiepileptogenic treatment effects. We found that use of seizure definition based on clinical criteria rather than event duration, and of recording montages closely sampling the activity of epileptic foci, maximize the power to detect treatment effects. Detection of treatment effects was marginally improved by prolonged recording, and 24h recording epochs were sufficient to provide 80% power to detect clinically interesting seizure control or prevention of seizures with small groups of animals. We conclude that appropriate electrode montage and clinically relevant seizure definition permit convenient deployment of fluid percussion injury and electrocorticography for epilepsy therapy development.

Rates and predictors of suicidal ideation during the first year after traumatic brain injury

OBJECTIVES

We examined rates of suicidal ideation (SI) after traumatic brain injury (TBI) and investigated whether demographic characteristics, preinjury psychiatric history, or injury-related factors predicted SI during the first year after injury.

METHODS

We followed a cohort of 559 adult patients who were admitted to Harborview Medical Center in Seattle, Washington, with a complicated mild to severe TBI between June 2001 and March 2005. Participants completed structured telephone interviews during months 1 through 6, 8, 10, and 12 after injury. We assessed SI using item 9 of the Patient Health Questionnaire (PHQ-9).

RESULTS

Twenty-five percent of the sample reported SI during 1 or more assessment points. The strongest predictor of SI was the first PHQ-8 score (i.e., PHQ-9 with item 9 excluded) after injury. Other significant multivariate predictors included a history of a prior suicide attempt, a history of bipolar disorder, and having less than a high school education.

CONCLUSIONS

Rates of SI among individuals who have sustained a TBI exceed those found among the general population. Increased knowledge of risk factors for SI may assist health care providers in identifying patients who may be vulnerable to SI after TBI.

A randomized controlled trial of venlafaxine XR for major depressive disorder after spinal cord injury: Methods and lessons learned

CONTEXT/OBJECTIVE

We describe the rationale, design, methods, and lessons learned conducting a treatment trial for major depressive disorder (MDD) or dysthymia in people with spinal cord injury (SCI).

DESIGN

A multi-site, double-blind, randomized (1:1) placebo controlled trial of venlafaxine XR for MDD or dysthymia. Subjects were block randomized and stratified by site, lifetime history of substance dependence, and prior history of MDD.

SETTING

Six SCI centers throughout the United States.

PARTICIPANTS

Across participating centers, 2536 subjects were screened and 133 were enrolled into the trial. Subjects were 18-64 years old and at least 1 month post-SCI. Interventions Twelve-week trial of venlafaxine XR versus placebo using a flexible titration schedule.

OUTCOME MEASURES

The primary outcome was improvement in depression severity at 12 weeks. The secondary outcome was improvement in pain.

RESULTS

This article includes study methods, modifications prompted by a formative review process, preliminary data on the study sample and lessons learned. We describe common methodological and operational challenges conducting multi-site trials and how we addressed them. Challenges included study organization and decision making, staff training, obtaining human subjects approval, standardization of measurement and treatment, data and safety monitoring, subject screening and recruitment, unblinding and continuity of care, database management, and data analysis.

CONCLUSIONS

The methodological and operational challenges we faced and the lessons we learned may provide useful information for researchers who aim to conduct clinical trials, especially in the area of medical treatment of depression in people with SCI.

Prevalence of and risk factors for poor functioning after isolated mild traumatic brain injury in children

This study aimed to determine the prevalence and predictors of poor 3 and 12 month quality of life outcomes in a cohort of pediatric patients with isolated mild TBI. We conducted a prospective cohort study of children and adolescents <18 years of age treated for an isolated mild TBI, defined as "no radiographically apparent intracranial injury" or "an isolated skull fracture, and no other clinically significant non-brain injuries." The main outcome measure was the change in quality of life from baseline at 3 and 12 months following injury, as measured by the Pediatric Quality of Life index (PedsQL). Poor functioning was defined as a decrease in total PedsQL score of >15 points between baseline and follow-up scores (at 3 and 12 months). Of the 329 patients who met inclusion criteria, 11.3% (95% CI 8.3-15.3%) at 3 months and 12.9% (95% CI 9.6-17.2%) at 12 months following injury had relatively poor functioning. Significant predictors of poor functioning included less parental education, Hispanic ethnicity (at 3 months following injury, but not at 12 months); low household income (at 3 and 12 months), and Medicaid insurance (at 12 months only). Children and adolescents sustaining a mild TBI who are socioeconomically disadvantaged may require additional intervention to mitigate the effects of mild TBI on their functioning.

Mild passive focal cooling prevents epileptic seizures after head injury in rats

OBJECTIVE

Post-traumatic epilepsy is prevalent, often difficult to manage, and currently cannot be prevented. Although cooling is broadly neuroprotective, cooling-induced prevention of chronic spontaneous recurrent seizures has never been demonstrated. We examined the effect of mild passive focal cooling of the perilesional neocortex on the development of neocortical epileptic seizures after head injury in the rat.

METHODS

Rostral parasagittal fluid percussion injury in rats reliably induces a perilesional, neocortical epileptic focus within weeks after injury. Epileptic seizures were assessed by 5-electrode video-electrocorticography (ECoG) 2 to 16 weeks postinjury. Focal cooling was induced with ECoG headsets engineered for calibrated passive heat dissipation. Pathophysiology was assessed by glial fibrillary acidic protein immunostaining, cortical sclerosis, gene expression of inflammatory cytokines interleukin (IL)-1α and IL-1β, and ECoG spectral analysis. All animals were formally randomized to treatment groups, and data were analyzed blind.

RESULTS

Cooling by 0.5 to 2°C inhibited the onset of epileptic seizures in a dose-dependent fashion. The treatment induced no additional pathology or inflammation, and normalized the power spectrum of stage N2 sleep. Cooling by 2°C for 5.5 weeks beginning 3 days after injury virtually abolished ictal activity. This effect persisted through the end of the study, >10 weeks after cessation of cooling. Rare remaining seizures were shorter than in controls.

INTERPRETATION

These findings demonstrate potent and persistent prevention and modification of epileptic seizures after head injury with a cooling protocol that is neuroprotective, compatible with the care of head injury patients, and conveniently implemented. The required cooling can be delivered passively without Peltier cells or electrical power.

Effect of citicoline on functional and cognitive status among patients with traumatic brain injury: Citicoline Brain Injury Treatment Trial (COBRIT)

CONTEXT

Traumatic brain injury (TBI) is a serious public health problem in the United States, yet no treatment is currently available to improve outcome after TBI. Approved for use in TBI in 59 countries, citicoline is an endogenous substance offering potential neuroprotective properties as well as facilitated neurorepair post injury.

OBJECTIVE

To determine the ability of citicoline to positively affect functional and cognitive status in persons with complicated mild, moderate, and severe TBI.

DESIGN, SETTING, AND PATIENTS

The Citicoline Brain Injury Treatment Trial (COBRIT), a phase 3, double-blind randomized clinical trial conducted between July 20, 2007, and February 4, 2011, among 1213 patients at 8 US level 1 trauma centers to investigate effects of citicoline vs placebo in patients with TBI classified as complicated mild, moderate, or severe.

INTERVENTION

Ninety-day regimen of daily enteral or oral citicoline (2000 mg) or placebo.

MAIN OUTCOME MEASURES

Functional and cognitive status, assessed at 90 days using the TBI-Clinical Trials Network Core Battery. A global statistical test was used to analyze the 9 scales of the core battery. Secondary outcomes were functional and cognitive improvement, assessed at 30, 90, and 180 days, and examination of the long-term maintenance of treatment effects.

RESULTS

Rates of favorable improvement for the Glasgow Outcome Scale-Extended were 35.4% in the citicoline group and 35.6% in the placebo group. For all other scales the rate of improvement ranged from 37.3% to 86.5% in the citicoline group and from 42.7% to 84.0% in the placebo group. The citicoline and placebo groups did not differ significantly at the 90-day evaluation (global odds ratio [OR], 0.98 [95% CI, 0.83-1.15]); in addition, there was no significant treatment effect in the 2 severity subgroups (global OR, 1.14 [95% CI, 0.88-1.49] and 0.89 [95% CI, 0.72-1.49] for moderate/severe and complicated mild TBI, respectively). At the 180-day evaluation, the citicoline and placebo groups did not differ significantly with respect to the primary outcome (global OR, 0.87 [95% CI, 0.72-1.04]).

CONCLUSION

Among patients with traumatic brain injury, the use of citicoline compared with placebo for 90 days did not result in improvement in functional and cognitive status.

TRIAL REGISTRATION

clinicaltrials.gov Identifier: NCT00545662.

Association of sleep and co-occurring psychological conditions at 1 year after traumatic brain injury

OBJECTIVES

To compare individuals' sleep 1 year after traumatic brain injury (TBI) with that of a healthy comparison group, and examine the relationship between sleep, co-occurring conditions, and functional status in those with TBI.

DESIGN

Longitudinal assessment of a prospectively studied sample of individuals with moderate to severe TBI. Assessment of sleep occurred at 1 year after TBI.

SETTING

Inpatient acute rehabilitation for TBI and community follow-up at 1 year postinjury.

PARTICIPANTS

Individuals with TBI (N=174) were recruited from consecutive admissions to an inpatient rehabilitation unit and enrolled into the TBI Model Systems study. Participant mean age was 38, and mean Glasgow Coma Scale score on admission was 9.3. Seventy-eight percent of the sample were men.

INTERVENTIONS

None.

MAIN OUTCOME MEASURES

Sleep was assessed with the Pittsburgh Sleep Quality Index (PSQI). Depression, anxiety, and pain were measured with the Patient Health Questionnaire-9, the Generalized Anxiety Disorder-7 Scale, and an analog pain rating scale, respectively.

RESULTS

Participants with TBI reported significantly greater sleep difficulties than the healthy comparison group. Forty-four percent of participants with TBI reported significant sleep problems (PSQI>5). Participants with 1 or more co-occurring conditions (depression, pain, or anxiety) had significantly worse sleep than those without such a condition. The highest level of sleep problems was reported by participants with multiple co-occurring conditions. Sleep problems were also associated with poor functional status.

CONCLUSIONS

Sleep difficulties are a frequent problem at 1 year after TBI, and often co-occur with depression, anxiety, and pain. Assessment and treatment of sleep difficulties should be included in clinical practice. Future research on the potential causal relationship among co-occurring conditions may assist in additional intervention planning.

Mortality and long-term functional outcome associated with intracranial pressure after traumatic brain injury

PURPOSE

Elevated intracranial pressure (ICP) has been associated with increased mortality in patients with severe traumatic brain injury (TBI). We have examined whether raised ICP is independently associated with mortality, functional status and neuropsychological functioning in adult TBI patients.

METHODS

Data from a randomized trial of 499 participants were secondarily analyzed. The primary endpoints were mortality and a composite measure of functional status and neuropsychological function (memory, speed of information processing, executive function) over a 6-month period. The area under the curve of the ICP profile (average ICP) during the first 48 h of monitoring was the main predictor of interest. Multivariable regression was used to adjust for a priori defined confounders: age, Glasgow Coma Score, Abbreviated Injury Scale-head and hypoxia.

RESULTS

Of the participants, 365 patients had complete 48-h ICP data. The overall 6-month mortality was 18 %. The adjusted odds ratio of mortality comparing 10-mmHg increases in average ICP was 3.12 (95 % confidence interval 1.79, 5.44; p < 0.01). Overall, higher average ICP was associated with decreased functional status and neuropsychological functioning (p < 0.01). Importantly, among survivors, increasing average ICP was not independently associated with worse performance on neuropsychological testing (p = 0.46).

CONCLUSIONS

Average ICP in the first 48 h of monitoring was an independent predictor of mortality and of a composite endpoint of functional and neuropsychological outcome at the 6-month follow-up in moderate or severe TBI patients. However, there was no association between average ICP and neuropsychological functioning among survivors.

Image-guided cerebrospinal fluid shunting in children: catheter accuracy and shunt survival

OBJECT

Cerebrospinal fluid shunt placement has a high failure rate, especially in patients with small ventricles. Frameless stereotactic electromagnetic image guidance can assist ventricular catheter placement. The authors studied the effects of image guidance on catheter accuracy and shunt survival in children.

METHODS

Pediatric patients who underwent placement or revision of a frontal ventricular CSF shunt were retrospectively evaluated. Catheters were placed using either anatomical landmarks or image guidance. Preoperative ventricular size and postoperative catheter accuracy were quantified. Outcomes of standard and image-guided groups were compared.

RESULTS

Eighty-nine patients underwent 102 shunt surgeries (58 initial, 44 revision). Image guidance was used in the placement of 56 shunts and the standard technique in 46. Shunt failure rates were not significantly different between the standard (22%) and image-guided (25%) techniques (p = 0.21, log-rank test). Ventricular size was significantly smaller in patients in the image-guided group (p < 0.02, Student t-test) and in the surgery revision group (p < 0.01). Small ventricular size did not affect shunt failure rate, even when controlling for shunt insertion technique. Despite smaller average ventricular size, the accuracy of catheter placement was significantly improved with image guidance (p < 0.01). Shunt accuracy did not affect shunt survival.

CONCLUSIONS

The use of image guidance improved catheter tip accuracy compared with a standard technique, despite smaller ventricular size. Failure rates were not dependent on shunt insertion technique, but an observed selection bias toward using image guidance for more at-risk catheter placements showed failure rates similar to initial surgeries.

An exploration of modifiable risk factors for depression after spinal cord injury: which factors should we target?

OBJECTIVE

To identify modifiable risk factors for depression in people with spinal cord injury (SCI).

DESIGN

Cross-sectional survey.

SETTING

Outpatient and community settings.

PARTICIPANTS

Community-residing people with SCI (N=244; 77% men, 61% white; mean age, 43.1y; 43% with tetraplegia) who were at least 1 month postinjury.

INTERVENTIONS

Not applicable.

MAIN OUTCOME MEASURES

Depression severity (Patient Health Questionnaire-9 [PHQ-9]), physical activity (International Physical Activity Questionnaire [IPAQ]), pleasant and rewarding activities (Environment Rewards Observation Scale [EROS]), and self-efficacy to manage the effects of SCI (Modified Lorig Chronic Disease Self-Management Scale).

RESULTS

Greater depression severity was associated with being 20 to 29 years of age, not completing high school, not working or attending school, and being ≤4 years post-SCI. After controlling for demographic and injury characteristics (adjusted R(2)=.13), lower EROS scores (change in adjusted R(2)=.34) and lower self-efficacy (change in R(2)=.13) were independent predictors of higher PHQ-9 scores. Contrary to predictions, physical activity as measured by the IPAQ did not predict depression severity.

CONCLUSIONS

Our findings suggest that having fewer rewarding activities, and to a lesser extent, having less confidence in one's ability to manage the effects of SCI are independent predictors of greater depression severity after SCI. Interventions such as behavior activation, designed to increase rewarding activities, may represent an especially promising approach to treating depression in this population.

Lamotrigine XR conversion to monotherapy: first study using a historical control group

The efficacy and safety of lamotrigine extended-release tablets (LTG XR) as monotherapy for partial seizures were evaluated using the conversion-to-monotherapy design, and historical data as the control. This methodology was recently approved by the United States Food and Drug Administration, and this study is the first historical control design in epilepsy to complete enrollment. Patients ≥13 years old with uncontrolled partial epilepsy receiving monotherapy with valproate or a noninducing antiepileptic drug were converted to once-daily LTG XR (250 mg or 300 mg) as monotherapy and were followed up for 12 additional weeks. Efficacy was measured by the proportion of patients meeting predefined escape criteria for seizure worsening compared with aggregated pseudoplacebo control data from 8 previously conducted conversion-to-monotherapy trials. Nonoverlap of the 95% confidence limit for LTG XR and the 95% prediction interval of the historical control denotes efficacy. Of 226 randomized patients, 174 (93 in 300 mg/day group and 81 in 250 mg/day group) started withdrawal of the background AED and were evaluated for escape. In the historical control analysis population, the lower 95% prediction interval of the historical control (65.3%) was not overlapped by the upper 95% confidence limit of either LTG XR (300 mg/day; 37.2%) or LTG XR (250 mg/day; 43.4%). Adverse events were reported in 53% and 61% of patients receiving LTG XR (300 mg/day and 250 mg/day, respectively). LTG XR (250 mg or 300 mg once daily) is effective for conversion-to-monotherapy treatment of partial seizures in patients ≥13 years old.

Rates of major depressive disorder and clinical outcomes following traumatic brain injury

CONTEXT

Uncertainties exist about the rates, predictors, and outcomes of major depressive disorder (MDD) among individuals with traumatic brain injury (TBI).

OBJECTIVE

To describe MDD-related rates, predictors, outcomes, and treatment during the first year after TBI.

DESIGN

Cohort from June 2001 through March 2005 followed up by structured telephone interviews at months 1 through 6, 8, 10, and 12 (data collection ending February 2006).

SETTING

Harborview Medical Center, a level I trauma center in Seattle, Washington.

PARTICIPANTS

Five hundred fifty-nine consecutively hospitalized adults with complicated mild to severe TBI.

MAIN OUTCOME MEASURES

The Patient Health Questionnaire (PHQ) depression and anxiety modules were administered at each assessment and the European Quality of Life measure was given at 12 months.

RESULTS

Two hundred ninety-seven of 559 patients (53.1%) met criteria for MDD at least once in the follow-up period. Point prevalences ranged between 31% at 1 month and 21% at 6 months. In a multivariate model, risk of MDD after TBI was associated with MDD at the time of injury (risk ratio [RR], 1.62; 95% confidence interval [CI], 1.37-1.91), history of MDD prior to injury (but not at the time of injury) (RR, 1.54; 95% CI, 1.31-1.82), age (RR, 0.61; 95% CI, 0.44-0.83 for > or = 60 years vs 18-29 years), and lifetime alcohol dependence (RR, 1.34; 95% CI, 1.14-1.57). Those with MDD were more likely to report comorbid anxiety disorders after TBI than those without MDD (60% vs 7%; RR, 8.77; 95% CI, 5.56-13.83). Only 44% of those with MDD received antidepressants or counseling. After adjusting for predictors of MDD, persons with MDD reported lower quality of life at 1 year compared with the nondepressed group.

CONCLUSIONS

Among a cohort of patients hospitalized for TBI, 53.1% met criteria for MDD during the first year after TBI. Major depressive disorder was associated with history of MDD and was an independent predictor of poorer health-related quality of life.

ECoG studies of valproate, carbamazepine and halothane in frontal-lobe epilepsy induced by head injury in the rat

The use of electrocorticography (ECoG) with etiologically realistic epilepsy models promises to facilitate the discovery of better anti-epileptic drugs (AEDs). However, this novel approach is labor intensive, and must be optimized. To this end, we employed rostral parasagittal fluid percussion injury (rpFPI) in the adolescent rat, which closely replicates human contusive closed head injury and results in posttraumatic epilepsy (PTE). We systematically examined variables affecting the power to detect anti-epileptic effects by ECoG and used a non-parametric bootstrap strategy to test several different statistics, study designs, statistical tests, and impact of non-responders. We found that logarithmically transformed data acquired in repeated-measures experiments provided the greatest statistical power to detect decreases in seizure frequencies of preclinical interest with just 8 subjects and with up to approximately 40% non-responders. We then used this optimized design to study the anti-epileptic effects of acute exposure to halothane, and chronic (1 week) exposures to carbamazepine (CBZ) and valproate (VPA) 1 month post-injury. While CBZ was ineffective in all animals, VPA induced, during treatment, a progressive decrease in seizure frequency in animals primarily suffering from non-spreading neocortical seizures, but was ineffective in animals with a high frequency of spreading seizures. Halothane powerfully blocked all seizure activity. The data show that rpFPI and chronic ECoG can conveniently be employed for the evaluation of AEDs, suggest that VPA may be more effective than CBZ to treat some forms of PTE, and support the theory that pharmacoresistance may depend on the severity of epilepsy. The data also demonstrate the utility of chronic exposures to experimental drugs in preclinical studies and highlight the need for greater attention to etiology in clinical studies of AEDs.

Haptoglobin phenotype and apolipoprotein E polymorphism: relationship to posttraumatic seizures and neuropsychological functioning after traumatic brain injury

The relationship of genetic predisposition to reduced iron capacity and apolipoprotein E (APOE) to posttraumatic seizures (PTSs) and neuropsychological outcomes was investigated in patients with traumatic brain injuries from a prior valproate clinical study. Haptoglobin concentration/phenotype and APOE genotype were determined in 25 patients with PTSs and 26 control (no PTSs) subjects approximately 10 years after traumatic brain injury. Haptoglobin phenotype was also determined in previously collected frozen samples for 25 additional patients with PTSs and 32 no-PTS subjects. There was no relationship between haptoglobin phenotype or APOE genotype and occurrence of PTSs. APOE genotype was not related to neuropsychological outcome; however, when adjustments were made for differences in educational levels, APOE epsilon4 subjects did worse, especially on tests of verbal intellectual and verbal memory skills. In contrast to our hypothesis, those with haptoglobin 1-1 (high-affinity binder of hemoglobin) scored somewhat worse on Verbal IQ and Tapping D at 1 and 12 months after injury.

Preventing and treating posttraumatic seizures: the human experience

Posttraumatic epilepsy presents an ideal target for prevention efforts. Traumatic brain injury (TBI) is common, characteristics that put people at high risk such as penetrating injury or subdural hematoma or provoked seizures are easily identified, and the latency between the injury and the onset of epileptic seizures is frequently short. Several drugs have been tested for their ability to prevent provoked seizures and epilepsy after TBI. We describe the design of those studies and their results. Phenytoin and carbamazepine significantly reduce the incidence of provoked seizures. Phenobarbital and the combination of phenobarbital and phenytoin also look promising for reducing provoked seizures, but small sample sizes in the studies evaluating these drugs do not allow definitive conclusions. None of the drugs studied (phenytoin, phenobarbital, their combination, carbamazepine, valproate, or magnesium) have shown reliable evidence that they prevent, or even suppress, epileptic seizures after TBI. For most of the regimens tested (the phenytoin/phenobarbital combination being the exception), the best estimate of effect is under a 25% reduction in posttraumatic seizures, well less than the 50% reduction most studies were designed to detect. The evaluation of the tested drugs has serious limitations, however, and antiepileptic drugs (AEDs) developed since 1980 and other compounds have barely been tested at all. Better understanding the process of epileptogenesis, testing treatments that demonstrate antiepileptogenic effects in the laboratory, and performing thorough preclinical and phase II evaluations before attempting definitive trials should greatly improve the chance of identifying ways to prevent posttraumatic epilepsy, providing the ultimate cure for this condition.

The effect of telephone counselling on reducing post-traumatic symptoms after mild traumatic brain injury: a randomised trial

BACKGROUND

Mild traumatic brain injury (MTBI) is a significant public health problem affecting approximately 1 million people annually in the USA. A total of 10-15% of individuals are estimated to have persistent post-traumatic symptoms. This study aimed to determine whether focused, scheduled telephone counselling during the first 3 months after MTBI decreases symptoms and improves functioning at 6 months.

METHODS

This was a two-group, parallel, randomised clinical trial with the outcome assessed by blinded examiner at 6 months after injury. 366 of 389 eligible subjects aged 16 years or older with MTBI were enrolled in the emergency department, with an 85% follow-up completion rate. Five telephone calls were completed, individualised for patient concerns and scripted to address education, reassurance and reactivation. Two composites were analysed, one relating to post-traumatic symptoms that developed or worsened after injury and their impact on functioning, the other related to general health status.

RESULTS

The telephone counselling group had a significantly better outcome for symptoms (6.6 difference in adjusted mean symptom score, 95% confidence interval (CI) 1.2 to 12.0), but no difference in general health outcome (1.5 difference in adjusted mean functional score, 95% CI 2.2 to 5.2). A smaller proportion of the treatment group had each individual symptom (except anxiety) at assessment. Similarly, fewer of the treatment group had daily functioning negatively impacted by symptoms with the largest differences in work, leisure activities, memory and concentration and financial independence.

CONCLUSIONS

Telephone counselling, focusing on symptom management, was successful in reducing chronic symptoms after MTBI.

TRIAL REGISTRATION NUMBER

ClinicalTrials.gov, #NCT00483444.

Gaining insight into patients' perspectives on participation in home management activities after traumatic brain injury

OBJECTIVE

This study investigated performance of home management activities 1 year after traumatic brain injury (TBI), as reported on the Functional Status Examination.

METHOD

Home management performance of 164 rehabilitation inpatients (mean age 35.4 years, 77% men, 75% white) with moderate to severe TBI was examined in relation to demographics, injury severity, neuropsychological functioning, and living situation.

RESULTS

Fifty-nine percent reported more difficulty or more assistance with home management at 1 year. Nonperformance of individual activities before injury ranged from 16% to 76%. Age (p= .001), living situation after injury (p = .002), and neuropsychological function at 1 year (p = .001) were associated with more limited home management performance after injury as compared to premorbid function.

CONCLUSIONS

Home management is challenging 1 year after TBI, especially for older adults and those with greater cognitive impairments. Accurate preinjury information is needed to determine the nature and extent of subsequent losses, guide treatment planning and interventions, and characterize recovery of function.

The measurement and magnitude of awareness difficulties after traumatic brain injury: a longitudinal study

Previous research suggests that reduced self-awareness is common following traumatic brain injury (TBI). However, few studies have examined the magnitude of this problem in a sample representative of hospitalized individuals. In this longitudinal study, individuals with complicated mild to severe TBIs and their significant others (SO) were evaluated at 1 and 12 months postinjury on the Sickness Impact Profile. Awareness was measured by comparing the level of injury-related problems reported by a person with TBI and their SO. Overall, individuals with TBI did not report fewer difficulties than their SO. In contrast, they frequently reported more injury-related difficulties than their SO. As there is no commonly or universally accepted definition for differential awareness, the magnitude of underreporting and over-reporting problems is presented using four different cutoff scores. A minimum discrepancy is proposed for defining awareness difficulties that is based on the standard error of measurement of the test-retest difference of the measure. Reduced self-awareness was inconsistent across both time and functional domains. These results suggest that reduced self-awareness is not the norm at 1 or 12 months postinjury and highlight the need for a more standardized approach to the measurement and classification of self-awareness.

Effect of time, injury, age and ethanol on interpatient variability in valproic acid pharmacokinetics after traumatic brain injury

BACKGROUND

Traumatic brain injury (TBI) results in an increase in hepatic metabolism. The increased metabolism is in significant contrast to a large body of in vitro and in vivo data demonstrating that activation of the host-defence response downregulates hepatic metabolism. Theoretically, this occurs because of activation of the pro-inflammatory cytokines tumour necrosis factor-alpha, interferon-gamma, interleukin (IL)-1 and IL-6. As part of a large double-blind, placebo-controlled clinical trial evaluating the use of valproic acid for prophylaxis of post-traumatic seizures, we obtained extensive valproic acid concentration-time data. Valproic acid is a hepatically metabolised, low extraction-ratio drug. Therefore, unbound clearance (CL(u)) is equal to intrinsic or metabolic clearance.

OBJECTIVE

The objective of this study was to evaluate the time-dependent effects of TBI on the pharmacokinetics of total and unbound valproic acid with the goal of identifying patient factors that may predict changes in total clearance (CL) and CL(u). In addition, by determining the factors that influence the magnitude and time course of induction of hepatic metabolism and understanding their interaction with the host-defence mediators, we can further our insight into the mechanism(s) responsible for the changes in CL and CL(u).

STUDY DESIGN

Valproic acid plasma concentration data were obtained from 158 TBI patients. Unbound valproic acid plasma concentrations were estimated using total valproic acid plasma and albumin concentrations following a Scatchard equation binding model previously developed in a subset of TBI patients. The effect of 13 patient factors on CL and CL(u) was evaluated initially in a univariate analysis. The significant factors were then included in a multiple linear regression analysis by use of step-wise selection and forward selection procedures.

RESULTS

CL and CL(u) were significantly increased after TBI in a time-dependent manner. The average increase was >75% by weeks 2 and 3 post-injury. The magnitude of the induction of CL was increased with decreased albumin concentrations, in addition to the presence of ethanol on admission, increased severity of head injury, tube feeding and total parenteral nutrition (TPN). The magnitude of induction of CL(u) was increased by older age, presence of ethanol on admission, increased severity of head injury, tube feeding, TPN, and if the patient had a post-injury neurosurgical procedure. The time to normalisation of CL(u) was significantly longer in patients with head injury plus other injuries compared with those with head injury alone.

CONCLUSIONS

As has been reported with other drugs, TBI results in a significant increase in the metabolism of valproic acid. The patient factors identified in this study that resulted in an increase in the magnitude and time course of the induction of CL(u) (ethanol, older age, presence of a neurosurgical procedure, severity of TBI and presence of multiple non-TBI injuries) have all been reported to cause a shift to the anti-inflammatory mediators IL-4 and IL-10. This suggests that the increase in hepatic metabolism after TBI may be due to the increased presence of anti-inflammatory mediators in contrast to the inhibition effect of the pro-inflammatory mediators in non-TBI inflammation and infection.

Timing of Surgery After Multisystem Injury With Traumatic Brain Injury: Effect on Neuropsychological and Functional Outcome

OBJECTIVE

The optimal timing for noncranial surgery after multisystem injury is not known. Early surgery may lead to decreased pulmonary complications and length of stay, but also predispose to secondary brain injury if decreased cerebral perfusion occurs intraoperatively. Previous work has not consistently evaluated neuropsychological or functional outcome. We sought to determine whether 6-month neuropsychological and functional outcome was associated with timing of noncranial surgery after traumatic brain injury.

MATERIALS

We performed a cohort study to evaluate the effect of timing of non-neurosurgical operative interventions on neuropsychological and functional outcome, morbidity, and mortality. Early surgery was defined as <or=24 hours after injury, and late surgery, >24 hours after injury but during the same admission. Patients with a nonoperative brain injury and an operative facial or orthopedic fracture were selected from two randomized trials previously performed at our Level I trauma center. Data were abstracted from medical records and outcome had been prospectively gathered as part of the two clinical trials.

RESULTS

Patients undergoing early or late surgery had similar demographics, overall injury severity, traumatic brain injury severity, and admission characteristics. The early group had more open orthopedic fractures, but also underwent multiple operations more often than did the late group. At 6 months postinjury, patients in the early group had a better composite neuropsychological score than did those in the late group on unadjusted analysis and after including a propensity score. After adjusting for potential confounders, this difference was significant. No significant differences in return to work or Glasgow Outcome Score were noted. The late group had a higher incidence of pneumonia and a longer hospital stay (p<0.10).

CONCLUSIONS

In traumatic brain injury patients with multisystem trauma, early timing of orthopedic and facial fracture fixation under general anesthesia was not associated with worse neuropsychological or functional outcome when compared with the outcomes associated with late surgery. Clinical conclusions may be limited by inherent selection bias and unmeasured confounding. However, these results contribute to equipoise regarding timing of surgery after multiple injuries, and emphasize the need for a randomized trial.

Magnesium sulfate for neuroprotection after traumatic brain injury: a randomised controlled trial

BACKGROUND

Traumatic brain injuries represent an important and costly health problem. Supplemental magnesium positively affects many of the processes involved in secondary injury after traumatic brain injury and consistently improves outcome in animal models. We aimed to test whether treatment with magnesium favourably affects outcome in head-injured patients.

METHODS

In a double-blind trial, 499 patients aged 14 years or older admitted to a level 1 regional trauma centre between August, 1998, and October, 2004, with moderate or severe traumatic brain injury were randomly assigned one of two doses of magnesium or placebo within 8 h of injury and continuing for 5 days. Magnesium doses were targeted to achieve serum magnesium ranges of 1.0-1.85 mmol/L or 1.25-2.5 mmol/L. The primary outcome was a composite of mortality, seizures, functional measures, and neuropsychological tests assessed up to 6 months after injury. Analyses were done according to the intention-to-treat principle. This trial is registered with , number .

FINDINGS

Magnesium showed no significant positive effect on the composite primary outcome measure at the higher dose (mean=55 average percentile ranking on magnesium vs 52 on placebo, 95% CI for difference -7 to 14; p=0.70). Those randomly assigned magnesium at the lower dose did significantly worse than those assigned placebo (48 vs 54, 95% CI -10.5 to -2; p=0.007). Furthermore, there was higher mortality with the higher magnesium dose than with placebo. Other major medical complications were similar between groups, except for a slight excess of pulmonary oedema and respiratory failure in the lower magnesium target group. No subgroups were identified in which magnesium had a significantly positive effect.

INTERPRETATION

Continuous infusions of magnesium for 5 days given to patients within 8 h of moderate or severe traumatic brain injury were not neuroprotective and might even have a negative effect in the treatment of significant head injury.

A Longitudinal Study of Health-Related Quality of Life After Traumatic Brain Injury

OBJECTIVE

To examine the longitudinal course of health-related quality of life from 1 month to 3 to 5 years after traumatic brain injury (TBI).

DESIGN

Longitudinal cohort study with 4 evaluation points.

SETTING

Level I trauma center.

PARTICIPANTS

Consecutive hospital admissions of 133 adolescents and adults with complicated mild to severe TBI who completed the outcome measure at all 4 time points, 111 general trauma patients, and 87 healthy friend controls.

INTERVENTIONS

Not applicable.

MAIN OUTCOME MEASURE

Sickness Impact Profile.

RESULTS

TBI patients reported significant limitations at 1 month postinjury, with substantial improvement occurring by 6 months, especially in the physical domain. Psychosocial improvement was smaller, and perceived cognitive, emotional, and communication difficulties did not change over the time period assessed. Persons with TBI had clear difficulties relative to healthy peers, but their reported level of difficulties was very similar to that of the persons who had sustained a general trauma by 1 year postinjury.

CONCLUSIONS

In this sample, TBI was associated with significant early limitations in most aspects of everyday life. Considerable improvement was noted over the first 6 months postinjury, especially in physical domains. Some aspects of psychosocial functioning also improved, although reported limitations in communication, cognitive, and emotional domains remained constant over time. These findings highlight the persistence of injury-related difficulties that compromise quality of life.

Functional Outcome Scales in Traumatic Brain Injury: A Comparison of the Glasgow Outcome Scale (Extended) and the Functional Status Examination

Clinical trials aimed at developing therapies for traumatic brain injury (TBI) require outcome measures that are reliable, validated, and easily administered. The most widely used of these measures, the Glasgow Outcome Scale (GOS) and the GOS-Extended (GOS-E), have been criticized as suffering from ceiling effects. In an attempt to develop a more useful and dynamic outcome measure, the Functional Status Examination (FSE) was developed, which grades outcome across 10 functional domains. The FSE has been demonstrated to be reliable and sensitive in monitoring recovery after TBI. This manuscript compares FSE with GOS-E in a cohort of patients with a wide range of injury severities. 177 individuals who survived at least 6 months after TBI were studied. The FSE and GOS-E were administered 6-12 months after injury. FSE and GOS-E scores correlated well with each other. FSE scores were distributed throughout the range, indicating that ceiling and floor effects were not present. Physiologic measures of injury severity (Glasgow Coma Score [GCS]) did not correlate with anatomic measures (Abbreviated Injury Scale [AIS] and Injury Severity Score [ISS]). GCS correlated weakly with both outcome measures, but AIS/ISS did not. We conclude that FSE and GOS-E are reliable outcome measures for TBI survivors, and FSE may offer some advantages over GOS-E due its ability to provide a more detailed description of deficits. The majority of the variance in outcome is not accounted for by currently available measures of injury severity.

Workers' risk of unemployment after traumatic brain injury: a normed comparison

We examined, among those persons working preinjury, the risk of unemployment 1 year after traumatic brain injury (TBI) relative to expected risk of unemployment for the sample under a validated risk-adjusted econometric model of employment in the U.S. population. Results indicate that 42% of TBI cases were unemployed versus 9% expected, relative risk (RR) = 4.5, 95% confidence interval (CI) (4.12, 4.95). The relative risk for unemployment was higher among males, those with higher education, persons with more severe injuries, and more impaired early neuropsychological or functional status. Difference in unemployment rates gave similar results for gender, severity of injury, and early neuropsychological and functional status. However, for education, the excess was smaller among those more highly educated, but the unemployment rate in the more highly educated in the general population was sufficiently small to yield a larger relative risk. In conclusion, after accounting for underlying risk of unemployment in the general population, unemployment is substantially higher after TBI for people who were employed when they were injured. The differential employment status varies depending on demographics, severity of brain injury, early functional outcome, and neurobehavioral indicators. For characteristics such as education, associated with rates of unemployment in the general population, different methods used to compare the rates may yield different results.

The Effect of a Scheduled Telephone Intervention on Outcome After Moderate to Severe Traumatic Brain Injury: A Randomized Trial

OBJECTIVE

To measure the effectiveness of a scheduled telephone intervention offering counseling and education to people with traumatic brain injury (TBI) on behavioral outcomes compared with standard follow-up at 1 year postinjury.

DESIGN

Two-group randomized, prospective clinical trial throughout the first year after injury.

SETTING

Subjects' homes via telephone in an urban-rural catchment area from a level I trauma center.

PARTICIPANTS

Subjects (N=171; age range, 18-70 y) with a primary diagnosis of TBI who were discharged from an acute rehabilitation unit. They were randomly assigned to the telephone intervention (n=85) or to standard follow-up (n=86) groups at discharge. Of these, 79 participated in the intervention and completed the outcome assessment (3 withdrew; 3 were lost to follow-up), and 78 participated in usual care and completed the outcome assessment (8 were lost to follow-up).

INTERVENTIONS

Subjects were randomly assigned to receive telephone calls at 2 and 4 weeks and 2, 3, 5, 7, and 9 months after discharge. The calls consisted of brief motivational interviewing, counseling, and education, plus facilitating usual care or usual care alone through follow-up appointments and therapy prescriptions.

MAIN OUTCOME MEASURES

A composite outcome was used as the primary endpoint on an intent-to-treat basis. Secondary analyses were conducted with individual measures, including the FIM instrument, Disability Rating Scale, Community Integration Questionnaire, Neurobehavioral Functioning Inventory, Functional Status Examination, Glasgow Outcome Scale-Extended, Medical Outcomes Study 36-Item Short-Form Health Survey, Brief Symptom Inventory, EuroQol, and Modified Perceived Quality of Life scale. The primary analysis was a blocked Mann-Whitney U test.

RESULTS

At 1-year follow-up, those who had received scheduled telephone intervention fared significantly better on the primary composite outcome index ( P =.002). In addition, this group fared better on specific composites such as functional status ( P =.003) and quality of well-being ( P =.006). There were no significant differences on vocational status ( P =.08) or community integration status ( P =.13).

CONCLUSIONS

Scheduled telephone counseling and education resulted in improved overall outcome, particularly for functional status and quality of well-being, when compared with usual outpatient care. Telephone counseling shows promise as a low-cost, widely available rehabilitation intervention for TBI.

Standard error in the Jacobson and Truax Reliable Change Index: the "classical approach" leads to poor estimates

Different authors have used different estimates of variability in the denominator of the Reliable Change Index (RCI). Maassen attempts to clarify some of the differences and the assumptions underlying them. In particular he compares the 'classical' approach using an estimate S(Ed) supposedly based on measurement error alone with an estimate S(Diff) based on the variability of observed differences in a population that should have no true change. Maassen concludes that not only is S(Ed) based on classical theory, but it properly estimates variability due to measurement error and practice effect while S(Diff) overestimates variability by accounting twice for the variability due to practice. Simulations show Maassen to be wrong on both accounts. With an error rate nominally set to 10%, RCI estimates using S(Diff) wrongly declare change in 10.4% and 9.4% of simulated cases without true change while estimates using S(Ed) wrongly declare change in 17.5% and 12.3% of the simulated cases (p < .000000001 and p < .008, respectively). In the simulation that separates measurement error and practice effects, SEd estimates the variability of change due to measurement error to be .34, when the true variability due to measurement error was .014. Neuropsychologists should not use SEd in the denominator of the RCI.

Access to inpatient rehabilitation after violence-related traumatic brain injury11No commercial party having a direct financial interest in the results of the research supporting this article has or will confer a benefit on the author(s) or on any organization with which the author(s) is/are associated

OBJECTIVES

To examine injury characteristics, demographics, and discharge disposition after traumatic brain injury of violent or nonviolent cause.

DESIGN

Cohort study.

SETTING

Level I trauma center.

PARTICIPANTS

Patients (N=1807) admitted with a Head Abbreviated Injury Score (AIS) of 2 or more over a 2-year period.

INTERVENTIONS

Not applicable.

MAIN OUTCOME MEASURES

Injury cause was classified as violent or nonviolent. Discharge disposition was classified as home, inpatient rehabilitation, skilled nursing facility (SNF), and other.

RESULTS

The violence group was more likely to be male, to include individuals from diverse racial groups, to have an alcohol level above the legal limit, to have a more severe Head AIS, and to have Medicaid funding and equal access to inpatient rehabilitation compared with the nonviolence group. The violence group, though, was more likely to be discharged to home than to inpatient rehabilitation and more likely to be discharged to inpatient rehabilitation than to an SNF. The nonviolence group had a longer acute care length of stay and a higher rate of injuries to other body systems.

CONCLUSIONS

People with violence-related injuries often present unique rehabilitation challenges. After accounting for injury severity and demographics, there was no evidence of bias against the violently injured in gaining access to inpatient rehabilitation services.

Natural history of depression in traumatic brain injury11No commercial party having a direct financial interest in the results of the research supporting this article has or will confer a benefit upon the author(s) or upon any organization with which the author(s) is/are associated

OBJECTIVE

To examine prospectively the rates, risk factors, and phenomenology of depression over 3 to 5 years after traumatic brain injury (TBI).

DESIGN

Inception cohort longitudinal study.

SETTING

Level I trauma center.

PARTICIPANTS

Consecutive admissions of 283 adults with moderate to severe TBI.

INTERVENTIONS

Not applicable.

MAIN OUTCOME MEASURE

Center for Epidemiologic Studies Depression (CES-D) Scale.

RESULTS

The rates of moderate to severe depression ranged from 31% at 1 month to 17% at 3 to 5 years. With 1 exception, the relation between brain injury severity and depression was negligible. Less than high school education, preinjury unstable work history, and alcohol abuse predicted depression after injury. Examination of CES-D factors indicate that, in addition to somatic symptoms, both depressed affect and lack of positive affect contribute to elevated CES-D scores.

CONCLUSIONS

High rates of depressive symptoms cannot be dismissed on grounds that somatic symptoms related to brain injury are mistaken for depression. Depressed affect and lack of positive affect are also elevated in persons with TBI. Preinjury psychosocial factors are predictive of depression and knowing them should facilitate efforts to detect, prevent, and treat depression after TBI.

Does Glucocorticoid Administration Prevent Late Seizures after Head Injury?

PURPOSE

Preventing posttraumatic epilepsy has been a difficult challenge. In this study we evaluated the association between glucocorticoid administration after traumatic brain injury (TBI) and posttraumatic seizures.

METHODS

We examined a seizure-prevention trial database of 404 patients with severe TBI for exposure to glucocorticoids in the early (<1 week) posttraumatic period. After controlling for seizure risk, we compared the odds of developing first and second late posttraumatic seizures between those that received glucocorticoids and those that did not.

RESULTS

Patients dosed with glucocorticoids within 1 day of their TBI were more likely to develop first late seizures than were those without [p = 0.04; hazard ratio = 1.74; 95% confidence interval (CI), 1.01-2.98]; whereas those receiving glucocorticoids > or =2 days after their injury had no similar association (p = 0.66; hazard ratio = 0.77; 95% CI, 0.23-2.56; p = 0.10 among the three groups). Receiving glucocorticoids within 1 day, or > or =2 days after TBI was not associated with second late seizure development.

CONCLUSIONS

Glucocorticoid treatment after TBI is not associated with decreased late posttraumatic seizures, and early treatment is associated with increased seizure activity.

A new and more robust test of QALYs

Previous empirical tests of quality-adjusted life-years (QALYs), the most widely used outcome measure in economic evaluations of health care, generally yielded negative results. These tests were, however, for the most part based on expected utility, which is now widely acknowledged to be descriptively inaccurate. The observed violations might, therefore, have been caused by violations of expected utility. We performed a new test of QALYs, which is valid under expected utility and under the two most influential non-expected utility theories, rank-dependent utility and prospect theory, and found considerable support for the QALY model. Our findings suggest that QALYs may be valid if nonexpected utility formulas are used to compute health state utilities.

Effect of valproate on hemostatic function in patients with traumatic brain injury

OBJECTIVES

To evaluate whether valproate (VPA) resulted in laboratory or clinical evidence of a change in bleeding-related measures associated with VPA therapy in patients sustaining a traumatic brain injury.

METHODS

Fibrinogen, platelet count and clot elastic shear modulus using the Thrombelastograph (TEG) coagulation analyzer were measured at baseline, 4, 14, 30, and 180 days post-injury. Clinically significant events, defined as the trigger for requiring a transfusion, were identified and evaluated as to possible treatment effects.

RESULTS

Compared to baseline, the platelet count in the VPA groups was decreased on day 4, increased by 100% on day 14, and returned to baseline levels by day 30. Fibrinogen was significantly increased by day 4 and returned to baseline by day 30. The platelet count was correlated with an increase in the maximum amplitude or width of the TEG tracing; a measure of strength of the clot, suggesting that valproate did not alter the clot strength contributed by platelets. None of the clinical events requiring transfusions appeared to be treatment related.

CONCLUSIONS

No serious hemostatic adverse events occurred in the trauma patients receiving VPA or phenytoin that could be attributed to treatment.

Outcome 3 to 5 years after moderate to severe traumatic brain injury

OBJECTIVE

To investigate neuropsychologic, emotional, and functional status and quality of life (QOL) 3 to 5 years after moderate to severe traumatic brain injury (TBI).

DESIGN

Observational cohort.

SETTING

Level I trauma center.

PARTICIPANTS

Consecutive adult admissions with TBI involving intracranial abnormalities, prospectively followed up for 3 to 5 years, with 80% follow-up.

INTERVENTIONS

Not applicable.

MAIN OUTCOME MEASURES

Neuropsychologic functioning (Paced Auditory Serial Addition Test, California Verbal Learning Test), emotional status (Center for Epidemiologic Studies Depression Scale, Brief Symptom Inventory), functional status (Functional Status Examination, Glasgow Outcome Scale, Medical Outcomes Study 36-Item Short-Form Health Survey, employment), and perceived QOL.

RESULTS

Significant functional limitations were observed in all areas. Recovery to preinjury levels ranged from 65% of cases in personal care to approximately 40% in cognitive competency, major activity, and leisure and recreation. Brain injury severity, measured by the modified Abbreviated Injury Scale, related to functional status and neuropsychologic functioning, but not to emotional or QOL measures. Length of impaired consciousness appeared to contribute to outcome more than did anatomic lesions.

CONCLUSIONS

The results provide representative estimates of long-term morbidity in patients with TBI involving intracranial lesions. The magnitude of morbidity was high. Although direct costs of TBI have received the most attention, the long-term consequences and their cost implications are much larger, unfold over time, and are borne by the survivors, their families, and the public subsidy system.

Risk Factors for Posttraumatic Seizures in Adults

PURPOSE

Traumatic brain injury has long been known to be a cause of epilepsy. Most information on risk factors for developing posttraumatic seizures is from before computed tomography (CT) scanning became universal. This article looks at factors about the injury or individual that put people at especially high risk of developing posttraumatic seizures.

METHODS

We considered 783 cases at high risk of developing seizures, followed up for 2 years as part of seizure prophylaxis studies. Cumulative incidence of seizures in subgroups and standardized incidence ratios were used to identify factors related to unprovoked seizure risk.

RESULTS

Subgroups with significantly elevated risk include those with evacuation of a subdural hematoma; surgery for an intracerebral hematoma; Glasgow Coma Scale in the severe range of 3 to 8; early seizures, especially delayed early seizures; time to following commands of a week or more; depressed skull fracture that was not surgically elevated; dural penetration by injury; at least one nonreactive pupil; and parietal lesions on CT scan.

CONCLUSIONS

Both the risk factors and the time course of the risk are important for designing seizure-prophylaxis studies and, if an effective prophylactic regimen is identified, for deciding on appropriate candidates for prophylaxis.

Neurobehavioral outcome in persons with violent or nonviolent traumatic brain injury

OBJECTIVE

To broaden the investigation of those injured violently by examining neuropsychological and psychosocial outcomes in relation to circumstances of traumatic brain injury and preinjury factors.

DESIGN

A prospective, longitudinal study.

PARTICIPANTS

A total of 752 adults with traumatic brain injury was grouped into those injured by violent or nonviolent circumstances and followed to 1-year post injury.

MAIN OUTCOME MEASURES

Circumstance groups were compared on demographics, preexisting conditions, brain injury severity, and neuropsychological and psychosocial outcomes.

RESULTS

The results indicate significant differences between the groups on demographics, preexisting conditions, and head injury severity. Neuropsychological and psychosocial outcome did not differ between the circumstance groups when all other factors were taken into account.

CONCLUSIONS

Injury severity and characteristics of the person that predate the injury were important to outcome rather than the circumstances of the injury itself.

Correlates of functional status 3-5 years after traumatic brain injury with CT abnormalities

The Functional Status Examination (FSE) is a relatively new measure of functional outcome after traumatic brain injury (TBI). This study examines functional status limitations and what contributes to them to further enhance interpretability of the FSE and to continue its development as an outcome measure. The measure was given to 209 adults sustaining TBI with CT abnormalities who were followed prospectively until three to five years after injury. Relationships between functional status change as assessed by the FSE and characteristics of the injury and pre-injury characteristics of the person injured were evaluated as were relationships with concurrent measures of neuropsychological, emotional, and psychosocial functioning, health status, quality of life, and other functional status measures. Groups based on degree of functional status limitations due to the injury differ significantly on injury severity, especially length of impaired consciousness. They do not differ on most pre-injury characteristics of the person injured, although pre-existing conditions, primarily alcohol abuse, are more common in those with more negative functional changes after injury. All concurrent measures examined differ significantly among FSE groups with strongest relationships with measures of quality of life, psychosocial functioning, and other measures of health status and functional status (each p < 0.001). The Functional Status Examination shows promise as a measure reflecting a broad range of functional limitations. The FSE is an excellent tool combining clinical relevance, face validity, strong relationships to other measures of relevant constructs (criterion-related validity), and reasonable sensitivity to TBI severity even long after the injury and in a mostly moderately injured group.

The natural history of drinking and alcohol-related problems after traumatic brain injury

OBJECTIVES

To describe changes in drinking from before traumatic brain injury (TBI) to 1 year after TBI.

DESIGN

Inception cohort with 1-year follow-up.

SETTING

Level I trauma center.

PARTICIPANTS

Adults (N=197) hospitalized with a broad range of head injury severity.

INTERVENTIONS

Not applicable.

MAIN OUTCOME MEASURES

Alcohol consumption and alcohol-related problems.

RESULTS

Drinking and alcohol-related problems decreased substantially from preinjury to 1 year after TBI. However, about one quarter of the sample reported heavy drinking, significant problems, or both during the first year after TBI. Preinjury alcohol use and problems were highly predictive of heavy use and problems after TBI.

CONCLUSION

Although drinking and alcohol-related problems decreased after TBI, there appears to be an ongoing need for prevention and intervention efforts. Screening for preinjury alcohol problems can be used to identify the vast majority of persons who will develop alcohol-related problems within 1 year after injury.

Nonrandomized studies of rehabilitation for traumatic brain injury: can they determine effectiveness?

OBJECTIVE

To examine the feasibility of investigating rehabilitation effectiveness for traumatic brain injury (TBI) with a nonrandomized design.

DESIGN

Observational cohort with confounder control by regression methodology.

SETTING

Level I trauma center.

PARTICIPANTS

Consecutive series of 365 individuals with TBI discharged to inpatient rehabilitation or home (78% follow-up).

INTERVENTIONS

Not applicable.

MAIN OUTCOME MEASURES

The Glasgow Outcome Scale (GOS), Sickness Impact Profile (SIP), Burden Inventory, and Perceived Quality of Life (PQOL). The predictors of interest: discharge to comprehensive inpatient rehabilitation or home and inpatient rehabilitation length of stay (LOS).

RESULTS

Discharge to rehabilitation was associated with poorer functioning on the GOS (P=.03) and SIP (P=.57), an increase on the Burden Inventory (P=.14), and improved PQOL (P=.20). Similar results were found for longer lengths of inpatient rehabilitation.

CONCLUSIONS

The results appear to be because of a confounding effect rather than rehabilitation. The study design could not control for confounding that resulted from unmeasured or difficult to measure aspects of the clinical decisions for discharge placement and rehabilitation LOS. Furthermore, typical severity indices were inadequate to control for injury severity and recovery. Matching designs that investigate TBI rehabilitation are also at risk for inadequate confounder control.

Prophylactic Anticonvulsants After Neurosurgery

Six prospective, controlled trials have examined the effects of antiepileptic drugs (AEDs) given to prevent the occurrence of seizures following neurosurgery. Some studies have concentrated on specific reasons for the neurosurgery (brain tumor) while others have included people with a variety of indications for surgery. Phenytoin (PHT) has been studied most, but carbamazepine (CBZ) and phenobarbital (PB) have also been evaluated to some extent. Studies of people with traumatic brain injury (some of whom were operated on) provide some, but less direct, evidence of the prophylactic effects of AEDs after neurosurgery. Despite considerable variation in reasons for the neurosurgery, AEDs given, and study design, the overall conclusions are remarkably consistent. The seizure risk is reduced about 40%-50% for the first week after neurosurgery in those given the older AEDs compared with those given placebo or no treatment. After the first few weeks, none of the drugs has been proven to reduce the incidence of seizures and in most situations the best estimate is essentially no effect, but effects on the order of a 25%-50% reduction in late (epileptic) seizures cannot be ruled out. The new generation of AEDs have not been tested as prophylactic agents after neurosurgery. Although there are no guidelines for prophylaxis following neurosurgery in general, these results are consistent with the guidelines of professional organizations for subsets of neurosurgery cases. Those guidelines consider prophylaxis, especially using PHT, to be an option for the first week after surgery but that the routine use of prophylactic anticonvulsants after the first week is not warranted.

Prophylactic Anticonvulsants After Neurosurgery

Six prospective, controlled trials have examined the effects of antiepileptic drugs (AEDs) given to prevent the occurrence of seizures following neurosurgery. Some studies have concentrated on specific reasons for the neurosurgery (brain tumor) while others have included people with a variety of indications for surgery. Phenytoin (PHT) has been studied most, but carbamazepine (CBZ) and phenobarbital (PB) have also been evaluated to some extent. Studies of people with traumatic brain injury (some of whom were operated on) provide some, but less direct, evidence of the prophylactic effects of AEDs after neurosurgery. Despite considerable variation in reasons for the neurosurgery, AEDs given, and study design, the overall conclusions are remarkably consistent. The seizure risk is reduced about 40%-50% for the first week after neurosurgery in those given the older AEDs compared with those given placebo or no treatment. After the first few weeks, none of the drugs has been proven to reduce the incidence of seizures and in most situations the best estimate is essentially no effect, but effects on the order of a 25%-50% reduction in late (epileptic) seizures cannot be ruled out. The new generation of AEDs have not been tested as prophylactic agents after neurosurgery. Although there are no guidelines for prophylaxis following neurosurgery in general, these results are consistent with the guidelines of professional organizations for subsets of neurosurgery cases. Those guidelines consider prophylaxis, especially using PHT, to be an option for the first week after surgery but that the routine use of prophylactic anticonvulsants after the first week is not warranted.

Antiepileptogenic agents: how close are we?

Epilepsy is a common neurological condition, affecting about 4% of individuals over their lifetime. Epilepsy can be idiopathic, secondary to an underlying genetic abnormality or unknown causes, or acquired. Known potential causes account for about one third of epilepsy. Control of epilepsy has primarily focused on suppressing seizure activity after epilepsy has developed. An intriguing possibility is to control acquired epilepsy by preventing epileptogenesis, the process by which the brain becomes epileptic. Many laboratory models simulate human epilepsy as well as provide a system for studying epileptogenesis. The kindling model involves repeated application of subconvulsive electrical stimulation to the brain, leading to spontaneous seizures. Other models include the cortical or systemic injection of various chemicals. These models suggest that many antiepileptic drugs, from phenobarbital and valproate (valproic acid) to levetiracetam and tiagabine, have antiepileptogenic potential. Some promising other possibilities include N-methyl-D-aspartate (NMDA) or alpha-amino-3-hydroxy-5-methylisoxazole-4-propionic acid (AMPA) antagonists as well as the neurotrophins and their receptors. Phenobarbital, phenytoin, valproate, carbamazepine and, to a very limited extent, diazepam have been evaluated in clinical trials to test whether they actually prevent epileptogenesis in humans. Results have been very disappointing. Meta-analyses of 12 different drug-condition combinations show none with significantly lower unprovoked seizure rates among those receiving the active drug. In 4 of the 12, the observed rate was actually slightly higher among treated individuals. None of the newer drugs have been evaluated in antiepileptogenesis trials. Until some drugs demonstrate a clear antiepileptogenic effect in clinical trials, the best course to reduce the incidence of epilepsy is primary prevention of the risk-increasing events--for example, wearing helmets, using seat belts, or decreasing the risk of stroke by reducing smoking.