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Considerations in fluids and electrolytes after traumatic brain injury.

Appropriate fluid management of patients with traumatic brain injury (TBI) presents a challenge for many clinicians. Many of these patients may receive osmotic diuretics for the treatment of increased intracranial pressure or develop sodium disturbances, which act to alter fluid balance. However, establishment of fluid balance is extremely important for improving patient outcomes after neurologic injury. The use of hyperosmolar fluids, such as hypertonic saline, has gained significant interest because they are devoid of dehydrating properties and may have other beneficial properties for patients with TBI. Electrolyte derangements are also common after neurologic injury, with many having neurologic manifestations. In addition, the role of electrolyte abnormalities in the secondary neurologic injury cascade is being delineated and may offer a potential future therapeutic intervention.

Brain Edema↗

Performance on the Wisconsin Card Sorting Test after traumatic brain injury.

The performance of 100 patients with traumatic brain injury (TBI) on the Wisconsin Card Sorting Test (WCST) was examined to determine the underlying latent structure as well as profile subtypes. Exploratory factor analysis with oblique rotation identified three factors: response accuracy, learning, and failure to maintain set. Marker variables from each factor were then included in a two-stage cluster analysis, which identified two reliable subtypes. Level of performance differences between these subtypes were meaningfully related to both demographic background and length of coma. It is concluded that interpretation of the WCST results of patients with TBI should consider the multifactorial nature of the instrument in combination with injury severity characteristics and demographic variables.

Adolescent↗

Insomnia following traumatic brain injury: a review.

Sleep disturbances after a traumatic brain injury (TBI) have received very little scientific attention despite the fact that several studies indicate that they may occur in 30% to 70% of patients. For individuals with TBI, problems falling asleep or maintaining sleep can exacerbate other symptoms such as pain, cognitive deficits, fatigue, or irritability. Sleep disturbances can thus compromise the rehabilitation process and the ability to return to work. This article reviews the evidence on the epidemiology, etiology, and treatment of insomnia in the context of TBI and proposes areas for future research. Prevalence estimates of insomnia complaints in TBI patients are summarized. Potential etiological factors (i.e., lesions to the nervous system, anxiety) and possible consequences of insomnia (i.e., fatigue, cognitive problems) in the context of TBI are discussed. Finally, pharmacological and psychological treatments previously shown effective to treat insomnia in healthy individuals are discussed as valuable treatment options for TBI patients. Increased knowledge about the high prevalence, diagnosis, and potential etiological factors of insomnia following TBI may promote a better identification, evaluation, and treatment of sleeping difficulties in this population.

Brain Injuries↗

Neuroimaging patterns associated with motor control in traumatic brain injury.

OBJECTIVE: To determine if patients with traumatic brain injury (TBI) and motor deficits show differences in functional activation maps during repetitive hand movements relative to healthy controls. Are there predictors for motor outcome in the functional maps of these patients? METHODS: In an exploratory cross-sectional study, functional magnetic resonance imaging (fMRI) was used to study the blood-oxygenation-level-dependent (BOLD) response in cortical motor areas of 34 patients suffering from moderate motor deficits after TBI as they performed unilateral fist-clenching motions. Twelve of these patients with unilateral motor deficits were studied 3 months after TBI and a 2nd time approximately 4 months later. RESULTS: Compared to age-matched, healthy controls performing the same task, TBI patients showed diminished fMRI-signal change in the primary sensorimotor cortex contralateral to the moving hand (cSM1), the contralateral dorsal premotor cortex, and bilaterally in the supplementary motor areas (SMAs). Clinical impairment and the magnitude of the fMRI-signal change in cSM1 and SMA were negatively correlated. Patients with poor and good motor recovery showed comparable motor impairment at baseline. Only patients who evolved to "poor clinical outcome" had decreased fMRI-signal change in the cSM1 during baseline. CONCLUSIONS: These observations raise the hypothesis that the magnitude of the fMRI-signal change in the cSM1 region could have prognostic value in the evaluation of patients with TBI.

Adolescent↗

Traumatic brain injury rehabilitation: is it worth the cost?

Traumatic brain injury (TB1) rehabilitation is a costly process. In past years it came under increasing scrutiny resulting from lack of hard data supporting its efficacy, as well as outright fraud and abuses in the head-injury rehabilitation industry. Nonetheless, appropriate TBI rehabilitation holds promise for improving the functional outcomes of brain injury survivors and can also reduce future expenditures. This article reviews the empirical literature regarding TBI rehabilitation outcome, with particular emphasis on studies that have examined the cost efficiency of rehabilitation. Specific implications and recommendations are offered for neuropsychologists who practice within the context of TBI rehabilitation.

Journal Article↗

APOE genotype influences acquisition and recall following traumatic brain injury.

APOE has been demonstrated to influence traumatic brain injury (TBI) outcome. The relationship between APOE genotype and memory following TBI was examined in 110 participants in the Defense and Veterans' Head Injury Program. Memory performance was worse in those who had an APOE epsilon 4 allele (n = 30) than those who did not (n = 80), whereas genotype groups did not differ on demographic or injury variables or on measures of executive functioning. These data support a specific role for the APOE protein in memory outcome following TBI, and suggest an APOE isoform-specific effect on neuronal repair processes.

Adult↗

Knowledge of post-concussional syndrome in naïve lay-people, general practitioners and people with minor traumatic brain injury.

BACKGROUND: Expectations about effects of minor traumatic brain injury (MTBI) may play a role in maintaining symptoms, the ability to simulate post-concussion syndrome (PCS) and the extent to which professionals might associate patient complaints with MTBI. In turn, expectations will be related to knowledge about MTBI. This study investigates knowledge of PCS in people with MTBI compared with general practitioners (GPs) and lay-people, using recall (a vignette) and symptom guessing or recognition (checklists). METHODS: Thirty GPs, 30 people with MTBI, and 30 lay-people generated symptoms from a vignette describing a MTBI. They then completed a PCS checklist or a checklist containing PCS and 'bogus' items pertaining to the vignette. RESULTS: Only 1 of 90 participants reported enough PCS symptoms to indicate 'caseness' from the vignette alone. Using checklists, more GPs (60%) than controls (20%) ticked enough symptoms to attain PCS 'caseness'. Few people with MTBI who did not themselves achieve PCS 'caseness' by self-report using checklists achieved 'caseness' using the vignette and checklists. The frequency of non-physical symptom reporting was higher than for physical symptom reporting. The addition of 'bogus' items to checklists did not affect responding. CONCLUSIONS: It is unlikely that pre-injury expectations about MTBI maintain PCS symptoms. PCS was difficult to simulate without prompting, even by GPs and PCS 'cases'. The use of 'caseness', rather than simple symptom scores, and further development of checklists with 'bogus' items may provide a more valid assessment of MTBI effects. GPs may benefit from further information about PCS and available treatments.

Adult↗

Health care utilization and needs after pediatric traumatic brain injury.

OBJECTIVE: Children with moderate to severe traumatic brain injury (TBI) show early neurobehavioral deficits that can persist several years after injury. Despite the negative impact that TBI can have on a child's physical, cognitive, and psychosocial well-being, only 1 study to date has documented the receipt of health care services after acute care and the needs of children after TBI. The purpose of this study was to document the health care use and needs of children after a TBI and to identify factors that are associated with unmet or unrecognized health care needs during the first year after injury. METHODS: The health care use and needs of children who sustained a TBI were obtained via telephone interview with a primary caregiver at 2 and 12 months after injury. Of the 330 who enrolled in the study, 302 (92%) completed the 3-month and 288 (87%) completed the 12-month follow-up interviews. The health care needs of each child were categorized as no need, met need, unmet need, or unrecognized need on the basis of the child's use of post-acute services, the caregiver's report of unmet need, and the caregiver's report of the child's functioning as measured by the Pediatric Quality of Life Inventory (PedsQL). Regardless of the use of services or level of function, children of caregivers who reported an unmet need for a health care service were defined as having unmet need. Children who were categorized as having no needs were defined as those who did not receive services; whose caregiver did not report unmet need for a service; and the whose physical, socioemotional, and cognitive functioning was reported to be normal by the caregiver. Children with met needs were those who used services in a particular domain and whose caregivers did not report need for additional services. Finally, children with unrecognized needs were those whose caregiver reported cognitive, physical, or socioemotional dysfunction; who were not receiving services to address the dysfunction; and whose caregiver did not report unmet need for services. Polytomous logistic regression was used to model unmet and unrecognized need at 3 and 12 months after injury as a function of child, family, and injury characteristics. RESULTS: At 3 months after injury, 62% of the study sample reported receiving at least 1 outpatient health care service. Most frequently, children visited a doctor (56%) or a physical therapist (27%); however, 37% of caregivers reported that their child did not see a physician at all during the first year after injury. At 3 and 12 months after injury, 26% and 31% of children, respectively, had unmet/unrecognized health care needs. The most frequent type of unmet or unrecognized need was for cognitive services. The top 3 reasons for unmet need at 3 and 12 months were (1) not recommended by doctor (34% and 31%); (2) not recommended/provided by school (16% and 17%); and (3) cost too much (16% and 16%). Factors that were associated with unmet or unrecognized need changed over time. At 3 months after injury, the caregivers of children with a preexisting psychosocial condition were 3 times more likely to report unmet need compared with children who did not have one. Also, female caregivers were significantly more likely to report unmet need compared with male caregivers. Finally, the caregivers of children with Medicaid were almost 2 times more likely to report unmet need compared with children who were covered by commercial insurance. The only factor that was associated with unrecognized need at 3 months after injury was abnormal family functioning. At 12 months after injury, although TBI severity was not significant, children who sustained a major associated injury were 2 times more likely to report unmet need compared with children who did not. Consistent with the 3-month results, the caregivers of children with Medicaid were significantly more likely to report unmet needs at 1 year after injury. In addition to poor family functioning's being associated with unrecognized need, nonwhite children were significantly more likely to have unrecognized needs at 1 year compared with white children. CONCLUSIONS: A substantial proportion of children with TBI had unmet or unrecognized health care needs during the first year after injury. It is recommended that pediatricians be involved in the post-acute care follow-up of children with TBI to ensure that the injured child's needs are being addressed in a timely and appropriate manner. One of the recommendations that trauma center providers should make on hospital discharge is that the parent/primary caregiver schedule a visit with the child's pediatrician regardless of the post-acute services that the child may be receiving. Because unmet and unrecognized need was highest for cognitive services, it is important to screen for cognitive dysfunction in the primary care setting. Finally, because the health care needs of children with TBI change over time, it is important for pediatricians to monitor their recovery to ensure that children with TBI receive the services that they need to restore their health after injury.

Adolescent↗

Augmented feedback for enhanced skill acquisition in individuals with traumatic brain injury.

Coincident timing by individuals who exhibit traumatic brain injury was measured under conditions of no knowledge of results (no KR; n = 12), KR on every trial (n = 14), summary KR (n = 13), and average KR (n = 12). Following acquisition trials, groups performed immediate and longer retention trials without KR. Absolute constant error and variable error, analyzed in separate repeated-measures analyses of variance, indicated that during acquisition trials subjects receiving KR on every trial were the most accurate and the most consistent in their responses; however, subjects in groups receiving summary and average KR were the most accurate during immediate retention, with the group receiving summary KR being the most accurate during longer retention.

Adolescent↗

The effectiveness of traumatic brain injury rehabilitation: a review.

The rehabilitation of traumatic brain injury (TBI) has undergone tremendous development over the past 20 years. A much more aggressive, extended and comprehensive approach is now common and clinically accepted. Multiple new forms and sites of treatment are utilized such as cognitive, behavioural, sub-acute and post-acute rehabilitation programmes. While there has been widespread clinical acceptance of these treatments the appearance of well-designed experimental or quasi-experimental studies actually evaluating the results of such treatment have been, until recently, generally lacking. This review article selects, analyses, and critiques the most salient of recent studies published regarding the overall clinical benefit, and to some extent the cost benefit, of TBI treatment programmes in their multiple forms. A conclusion which is reached following this survey is that while truly randomized controlled studies still have not been achieved, an impressive variety of studies of quasi-experimental design have been completed. The overall conclusion from these studies is that the efficacy (and cost-effectiveness) of TBI rehabilitation is strongly supported.

Brain Damage, Chronic↗

What is the optimal threshold for cerebral perfusion pressure following traumatic brain injury?

Intensive care of the patient with traumatic brain injury centers on control of intracranial pressure and cerebral perfusion pressure (CPP). The optimal CPP by definition delivers an adequate supply of blood and oxygen to meet the metabolic demands of brain tissue. A great deal of controversy exists regarding the optimal CPP value, with disparate studies providing conflicting evidence for the use of supraphysiological CPP values. No study that accurately assesses the efficacy of normal CPP compared with elevated CPP has been performed, but several studies demonstrate that a CPP threshold exists on an individual basis for patients with TBI. The use of brain monitors of cerebral metabolism and oxygen supply may assist the clinician in the selection of the optimal CPP for an individual patient.

Blood Pressure↗

Serum neuron-specific enolase, S100B, and myelin basic protein concentrations after inflicted and noninflicted traumatic brain injury in children.

OBJECT: Misdiagnosis of inflicted traumatic brain injury (iTBI) is common. Serum biomarkers may be able to assist in the detection of iTBIs that would otherwise be missed. The authors investigated whether serum concentrations of biomarkers were increased after noninflicted (n)TBI and iTBI in pediatric cases of varying severity. METHODS: This prospective, case-control study involved 100 patients (56 with nTBI, 44 with iTBI) and 64 controls. Blood was collected in patients within 12 hours of injury; a subset had serial samples. A single sample was collected from controls. Serum neuron-specific enolase (NSE), S100B, and myelin basic protein concentrations were measured. Abnormal concentrations were defined using receiver-operator characteristic (ROC) curves. The sensitivity and specificity of initial NSE and S100B and peak myelin basic protein concentrations for identifying TBI at ROC curve-defined cutoffs were 71 and 64% (NSE), 77 and 72% (S100B), and 44 and 96% (myelin basic protein), respectively. Eighty-six percent of patients having suffered iTBI had one or more biomarkers increased, including 82% of children with iTBI and a Glasgow Coma Scale score of 15, and two children with iTBI who were initially misdiagnosed. Children with iTBI had a later peak concentration of all three biomarkers and were more likely to have increased myelin basic protein levels at admission compared with patients with nTBI. CONCLUSIONS: Serum NSE, S100B, or myelin basic protein are increased in the majority of children with acute nTBI and iTBI, including well-appearing children with iTBI in whom the diagnosis might otherwise have been missed. Differences in the time course of NSE, S100B, and myelin basic protein after nTBI and iTBI may provide insight into the pathophysiology of iTBI. These serum markers should be prospectively evaluated in a target population of infants.

Biomarkers↗

Community participation and quality of life outcomes after adult traumatic brain injury.

OBJECTIVE: This study examined outcomes after traumatic brain injury in adults salient to occupational therapy. METHOD: Demographic data and Functional Independence Measure (FIM) scores from the inpatient rehabilitation stay were first gathered from a retrospective chart review. At follow-up, 25 adults, on average 21 months post-injury, completed measures of disability, community participation, quality of life, and satisfaction with occupational therapy during a telephone interview. Analysis of covariance was used to test the differences between pretest and posttest scores on the FIM; regression analysis and correlations were used to analyze predictions and relationships. RESULTS: Statistically significant improvements in FIM scores during rehabilitation were predictive of the level of long-term disability and community participation among participants. At follow-up, participants were often unemployed, depressed and withdrawn, and experienced limitations in decision making, hand use, bladder control, and community integration. Less disability and more community participation were related to higher quality of life. Satisfaction with occupational therapy, although high, was unrelated to most outcomes. CONCLUSION: Results support the premise that participation is associated with a high quality of life, yet persons with brain injury have significant needs for long-term occupational therapy.

Activities of Daily Living↗

Physiological and structural evidence for hippocampal involvement in persistent seizure susceptibility after traumatic brain injury.

Epilepsy is a common outcome of traumatic brain injury (TBI), but the mechanisms of posttraumatic epileptogenesis are poorly understood. One clue is the occurrence of selective hippocampal cell death after fluid-percussion TBI in rats, consistent with the reported reduction of hippocampal volume bilaterally in humans after TBI and resembling hippocampal sclerosis, a hallmark of temporal-lobe epilepsy. Other features of temporal-lobe epilepsy, such as long-term seizure susceptibility, persistent hyperexcitability in the dentate gyrus (DG), and mossy fiber synaptic reorganization, however, have not been examined after TBI. To determine whether TBI induces these changes, we used a well studied model of TBI by weight drop on somatosensory cortex in adult rats. First, we confirmed an early and selective cell loss in the hilus of the DG and area CA3 of hippocampus, ipsilateral to the impact. Second, we found persistently enhanced susceptibility to pentylenetetrazole-induced convulsions 15 weeks after TBI. Third, by applying GABA(A) antagonists during field-potential and optical recordings in hippocampal slices 3 and 15 weeks after TBI, we unmasked a persistent, abnormal APV-sensitive hyperexcitability that was bilateral and localized to the granule cell and molecular layers of the DG. Finally, using Timm histochemistry, we detected progressive sprouting of mossy fibers into the inner molecular layers of the DG bilaterally 2-27 weeks after TBI. These findings are consistent with the development of posttraumatic epilepsy in an animal model of impact head injury, showing a striking similarity to the enduring behavioral, functional, and structural alterations associated with temporal-lobe epilepsy.

2-Amino-5-phosphonovalerate↗

An Early Onset Rehabilitation Program for Children and Adolescents after Traumatic Brain Injury (TBI): Methods and First Results.

Survived traumatic brain injuries (TBI) are one of the most serious challenges to the patient's future life. Recent literature increasingly questions the long believed protective effects of functional cerebral plasticity in children. Although TBI in children and adolescents is frequent, they are less frequently admitted to rehabilitation centers as in-patients than adults. This emphasizes the role of out-patient treatment. The progressing study described here aims to achieve a contribution to a comprehensive approach in TBI-rehabilitation for youngsters. A two-stage multimethodal program, starting with stimulation in coma while the patient is on the intensive care unit, and neuropsychological therapy after regaining consciousness is to be evaluated in a controlled, prospective and randomized study. After including nearly 50 % of the planned sample (100 persons), some preliminary results can be mentioned with all applicable caution. The effectiveness of the applied therapy can be stated here with respect to the posttraumatic development of intellectual abilities in the 6- and 12 months follow ups. Moreover, in the control group development of psychopathological alterations was found to a considerable degree and also lower ratings in a quality of life questionnaire, compared to the experimental group. It is expected to prove these differences statistically, after the total sample has been included, and thus equal distributions have been achieved in all predictive variables.

Journal Article↗

Review article: altered states of consciousness, theories of recovery, and assessment following a severe traumatic brain injury.

The causes and consequences of severe traumatic brain injury are reviewed, including mechanical injury and neurochemical changes following focal and diffuse injuries. A discussion of terminology seeks to clarify current nomenclature and descriptions of behaviours during emergence from coma. Theories of recovery following severe brain injury are reviewed including diaschisis, plasticity and compensation, redundancy, environmental regulation, and excess disability. Several assessment tools that have been recommended for use with this population of individuals in an altered state of consciousness following coma are discussed and critiqued. They include the Glasgow Coma Scale, Ranchos Los Amigos Levels of Cognitive Functioning Assessment Scale, Western Neuro Sensory Stimulation Profile, Coma Near Coma Scale, Freeman Questionnaire, and the Sensory Modality Assessment Rehabilitation Technique.

Brain Injuries↗

Acute changes in regional cerebral (18)F-FDG kinetics in patients with traumatic brain injury.

UNLABELLED: During the acute phase after traumatic brain injury (TBI), the metabolic state is regionally heterogeneous. The purpose of this study was to characterize contusional, pericontusional, and remote regions of TBI by estimating glucose transporter and hexokinase activities on the basis of (18)F-FDG kinetic modeling. METHODS: A standard 2-compartment model was used to measure (18)F-FDG kinetic parameters in 21 TBI patients with cerebral contusions studied during the acute phase (3.1 +/- 2.1 [mean +/- SD] d after injury). Nineteen patients also underwent (15)O-water PET to measure regional cerebral blood flow (CBF). A control study ((18)F-FDG and (15)O-water) was done with 18 healthy volunteers. The rate constants K(i), K(1), and k(3) were assumed to represent the uptake, transport, and hexokinase activity of (18)F-FDG, respectively; K(i) was calculated as K(1) x [k(3)/(k(2) + k(3))]. RESULTS: The areas of contusional and pericontusional tissues located 4.5, 13.5, and 22.5 mm away from the contusion (PC(4.5), PC(13.5), and PC(22.5), respectively) demonstrated significantly reduced K(1) values, whereas the K(1) values for remote areas remained normal. The k(3) values were significantly reduced regardless of the distance from the contusion. Pericontusional areas with CT- or MRI-evidenced tissue damage showed significantly lower K(i) (P < 0.001), CBF (P < 0.01), and K(1) (P < 0.0001) values than did areas without such damage, whereas the k(3) values did not differ significantly. Seven patients showed regionally increased (18)F-FDG uptake (hot spots) in pericontusional areas. The k(3) value for the hot spots (0.086 +/- 0.024/min) was significantly higher than that for the remote cortex (P < 0.01), whereas the K(i), CBF, and K(1) values did not show significant differences. Patients with hot spots showed significantly higher K(i) and k(3) values in PC(4.5) (P < 0.05) and higher k(3) values in PC(22.5) (P < 0.05) than did patients without hot spots, whereas the K(1) and CBF values did not differ significantly. CONCLUSION: Brain tissue (18)F-FDG kinetics in TBI patients were consistent with reduced hexokinase activity in the whole brain (including apparently uninjured cortex), whereas glucose transport was impaired only in the area immediately around the contusion. Pericontusional high levels of (18)F-FDG uptake observed in a subgroup of patients could have been the result of regionally increased hexokinase activity.

Acute Disease↗

Surgical decision making for residual limb deformities following traumatic brain injury.

When neurologic recovery has plateaued following traumatic brain injury, careful assessment is needed prior to making surgical decisions to correct residual limb deformities. Sufficient cognition to follow simple commands, cooperate with postoperative therapy, and benefit from improved function is essential. Sensation must also be intact. Motor control of the extremity can be evaluated by clinical examination supplemented by nerve blocks to relieve spasticity in antagonistic muscle groups. Dynamic electromyography is frequently required for surgical decision making. Hand placement may be deterred by spasticity of the brachioradialis, biceps, and brachialis muscles. Active finger extension may be masked by spastic flexors. In the lower extremity, knee flexion may be blocked during the preswing period by inappropriate firing of one or more components of the quadriceps. The equinovarus deformity of the foot is the result of spasticity of the gastrocsoleus muscles, the toe flexors, and the tibialis anterior.

Arm↗