Review article: Prehospital fluid management in traumatic brain injury

The early management of patients who have sustained traumatic brain injury is aimed at preventing secondary brain injury through avoidance of cerebral hypoxia and hypoperfusion. Especially in hypotensive patients, it has been postulated that hypertonic crystalloids and colloids might support mean arterial pressure more effectively by expanding intravascular volume without causing problematic cerebral oedema. We conducted a systematic review to investigate if hypertonic saline or colloids result in better outcomes than isotonic crystalloid solutions, as well as to determine the safety of minimal volume resuscitation, or delayed versus immediate fluid resuscitation during prehospital care for patients with traumatic brain injury. We identified nine randomized controlled trials and one cohort study examined the effects of hypertonic solutions (with or without colloid added) for prehospital fluid resuscitation. None has reported better survival and functional outcomes over the use of isotonic crystalloids. The only trial of restrictive resuscitation strategies was underpowered to demonstrate its safety compared with aggressive early fluid resuscitation in head injured patients, and maintenance of cerebral perfusion remains the top priority.     

Injury-associated hypothermia: an analysis of the 2004 National Trauma Data Bank

Severe injury and shock are frequently associated with abnormalities in patient body temperature. Substantial increases in mortality have been associated with profound hypothermia, especially below 35 degrees C. The purpose of this study was to further characterize the impact of hypothermia in a large dataset of trauma patients. This study was a retrospective analysis of the 2004 version of the National Trauma Data Bank (NTDB), which contains approximately 1.1 million patients from over 400 trauma centers. Admission temperature was analyzed with respect to mortality, injury severity score (ISS), base deficit (BD), Glasgow Coma Score (GCS), and hospital outcomes. The NTDB contained 701,491 patients with temperatures recorded upon trauma center admission. Of these, 11,026 patients had admission temperatures <35 degrees C, and 802 had temperatures <32 degrees C. Comparison of core temperature versus mortality revealed that as temperature decreased, the mortality rate increased, reaching approximately 39% at 32 degrees C, and remained constant at lower temperatures. Surprisingly, 477 patients (59.5%) survived with temperatures <32 degrees C. Similarly, BD increased as hypothermia worsened until body temperature reached 31 degrees C, below which there was little further increase. Patients with admission temperatures less than 35 degrees C had significantly greater mortality (25.5% vs. 3.0%, P < 0.001) and BD (7.8 vs. 3.7, P < 0.001) when compared with patients with temperatures >or=35 degrees C. In survivors, average ventilator days and intensive care unit (ICU) days were 14.4 and 12.8, respectively, for patients with temperatures <35 degrees C as opposed to more normothermic patients who demonstrated an average of 9.5 ventilator days and 9.1 ICU days (P < 0.001). When grouped by individual ISS, BD level, and GCS motor score, mortality was significantly greater when admission temperature was below 35 degrees C (ISS mean difference = 11.4%, BD mean difference = 22.8%, and GCS motor mean difference = 9.85%). Logistic regression revealed that hypothermia remains an independent determinant of mortality after correction for confounding variables (odds ratio = 1.54, 95% confidence interval 1.40-1.71). Admission hypothermia is associated with greater mortality, increased injury severity, more profound acidosis, and prolonged ICU/ventilator courses. However, although mortality at <32 degrees C is high, patients with temperatures this low do survive. As temperatures drop below 32 degrees C, mortality rates remain constant, which may indicate a threshold below which physiologic mechanisms are unable to correct body temperature regardless of injury severity. Although shock severity is highly indicative of outcome, hypothermia independently contributes to the substantial mortality associated with severe injury.     

Vestibulo-ocular monitoring as a predictor of outcome after severe traumatic brain injury

Introduction  

Based on the knowledge that traumatic brainstem damage often leads to alteration in brainstem functions, including the vestibulo-ocular reflex, the present study is designed to determine whether prediction of outcome in the early phase after severe traumatic brain injury is possible by means of vestibulo-ocular monitoring.     

Cognitive outcome in traumatic brain injury survivors

PURPOSE OF REVIEW: This review discusses recent studies investigating the cognitive and psychiatric outcome of posttraumatic brain injury. In addition, it aims to highlight key areas for future research. RECENT FINDINGS: Detailed cognitive assessments have revealed particular deficits in processing speed in the visual domain and the detrimental impact of interference on attentional performance. A pilot functional imaging study revealed neural changes in survivors performing a response inhibition task, even when matched to controls on behavioural indices. Recent psychiatric studies highlight the incidence of these disorders in the survivors and attempt to characterize distinct psychiatric profiles. Adult and child survivors appear to show differential difficulties. Successful rehabilitation strategies addressing these psychiatric and cognitive deficits include holistic intensive neuropsychological interventions and the introduction of electronic devices. Systematic randomized trials are needed to provide an adequate evidence base for clinical practice. The potential for cognitive enhancement using psychopharmacological agents has yet to be exploited. These treatments may lead to improved quality of life for traumatic brain injury survivors and their families. SUMMARY: Survivors of head injury show a diverse pattern of cognitive and psychiatric profiles. Recent research highlights the nature of some of these deficits and possible ways to enhance functioning. However, the area is well poised for rapid progress in the understanding of cognitive and emotional dysfunction following traumatic brain injury (TBI) and its rehabilitation through neuropsychological and psychopharmacological means.     

Prehospital endotracheal intubation in patients with severe traumatic brain injury: Guidelines versus reality

The international Brain Trauma Foundation guidelines recommend prehospital endotracheal intubation in all patients with traumatic brain injury (TBI) and a Glasgow Coma Scale (GCS) ≤ 8. Close adherence to these guidelines is associated with improved outcome, but not all severely injured TBI patients receive adequate prehospital airway support. Here we hypothesized that guideline adherence varies when skills are involved that rely on training and expertise, such as endotracheal intubation.We retrospectively studied the medical records of CT-confirmed TBI patients with a GCS ≤ 8 who were referred to a level 1 trauma centre in Amsterdam (n = 127). Records were analyzed for demographic parameters, prehospital treatment modalities, involvement of an emergency medical service (EMS) and respiratory and metabolic parameters upon arrival at the hospital.Patients were mostly male, aged 45 ± 21 years with a median injury severity score (ISS) of 26. Of all patients for whom guidelines recommend endotracheal intubation, only 56% were intubated. In 21 out of 106 severe cases an EMS was not called for, suggesting low guideline adherence. Especially those TBI patients treated by paramedics tended to develop higher levels of stress markers like glucose and lactate.We observed a low degree of adherence to intubation guidelines in a Dutch urban area. Main reasons for low adherence were the unavailability of specialized care, scoop and run strategies and absence of a specialist physician in cases where intubation was recommended. The discrepancy between guidelines and reality warrants changing practice to improve guideline compliance and optimize outcome in TBI patients.     

Air Versus Ground Transportation in Isolated Severe Head Trauma: A National Trauma Data Bank Study

Background

The effect of prehospital helicopter emergency medical services (HEMS) on mortality has been analyzed previously in polytrauma patients with discordant results.

Predictors of driving outcome after traumatic brain injury

OBJECTIVE: To examine predictors of driving status and fitness to drive after traumatic brain injury (TBI). DESIGN: Retrospective and prospective follow-up of a cohort ranging from 4 months to 10 years post-TBI. SETTING: A Midwestern, urban university-affiliated rehabilitation hospital. PARTICIPANTS: Seventy-one pairs of adults who had sustained a TBI and their significant others. INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURES: Driving status (whether the patient resumed driving), driving frequency (estimated miles driven per week), and postinjury driving records compiled by the Department of Motor Vehicles. RESULTS: Logistic and hierarchical regression analyses indicated that the significant other's perceptions of the patient's fitness to drive were the strongest predictor of patients' driving status and driving frequency. However, years postinjury, disability at discharge, and current neuropsychologic functioning best predicted postinjury driving safety as measured by actual incidents. The relation between perception of patients' fitness and actual driving incidents, however, was modest. CONCLUSIONS: Neuropsychologic and medical information available by traditional methods showed unique value in predictive driving safety. However, caregiver perception of patients' fitness was the overwhelming determinant of whether and how much patients drive. The bases on which caregivers form their opinions affect the safety of patients and the public. The rehabilitation setting is a unique resource for family education regarding abilities essential to safe driving.     

Urologic dysfunction and neurologic outcome in coma survivors after severe traumatic brain injury in the postacute and chronic phase

Giannantoni A, Silvestro D, Siracusano S, Azicnuda E, D'Ippolito M, Rigon J, Sabatini U, Bini V, Formisano R. Urologic dysfunction and neurologic outcome in coma survivors after severe traumatic brain injury in the postacute and chronic phase.

Objectives

To investigate voiding dysfunction and upper urinary tract status in survivors of coma resulting from traumatic brain injury (TBI), and to compare clinical and urodynamic results with neurologic and psychological features as well as functional outcomes.

Design

Observational study focused on urologic dysfunction and neurologic outcome in coma survivors after traumatic brain injury in the postacute and chronic phase.

Setting

A postcoma unit in a rehabilitation hospital.

Participants

Consecutive patients (N=57) who recovered from coma of traumatic etiology and who were admitted during a 1-year period to a postcoma unit of a rehabilitation hospital.

Interventions

Patients underwent clinical urologic assessment, urodynamics with the assessment of the Schafer nomogram and the projected isovolumetric detrusor pressure to evaluate detrusor contractility, ultrasound assessment of the lower and upper urinary tract and voiding cystourethrography, routinely performed, according to the International Continence Society Standards. Neurologic variables assessed were brain injury and disability severity, and neuropsychological status. Neuroimaging identified the site of cerebral lesions.

Main Outcome Measures

Urinary symptoms, disability by means of the Glasgow Outcome Scale (GOS), and neuropsychological status by means of the Neurobehavioral Rating Scale (NBRS), and the relationships among them.

Results

Of the 57 patients studied, 30 had overactive bladder (urge incontinence) symptoms, 28 had detrusor overactivity, and 18 had detrusor underactivity with associated pseudodyssynergia in 15 of these patients. Eleven patients had hypertrophic bladder; 3, bilateral pyelectasia; and 2, vesicoureteral reflux. Disability measured by GOS was severe in 8 patients and moderate in 27, while recovery was good in 22 patients. The mean NBRS total score indicated a mild cognitive impairment. Neuroimaging showed diffuse brain injury in all patients. Statistically significant relationships were found between urge incontinence, detrusor overactivity, and poor neurologic functional outcome, between detrusor overactivity and right hemisphere damage (P=.0001), and between impaired detrusor contractility and left hemisphere injuries (P=.0001).

Conclusions

Most patients who recovered from coma resulting from TBI have symptoms of overactive bladder syndrome and voiding difficulties. These urinary problems correlate with cerebral involvement and neurologic functional outcome.     

Functional outcome following traumatic brain injury: the Turkish experience

The objectives of this study were to describe the demographic characteristics and the nature of the functional recovery in a group of Turkish survivors of traumatic brain injury (TBI) who were referred for inpatient rehabilitation and identify variables correlated with discharge functional status as measured by the Functional Independence Measure (FIM). There were 40 patients in the study, 32 (69.6%) male and eight (17.4%) female, mean age 28+/-9.8 years. Motor vehicle accidents accounted for 62.5% of injuries, 22.5% of injuries occurred from violence and 15% resulted from falls. The mean durations of acute hospital stay, coma, and rehabilitation stay was 68, 26.7, and 78.4 days, respectively. Extracranial injuries including bone fractures were the most common associated injuries and medical complications such as spasticity and contractures were present in more than half of the patients.TBI survivors in this study made statistically significant functional improvements. Discharge FIM were significantly correlated with the admission FIM, durations of acute hospital stay and coma, and time since TBI. Multiple regression analysis of the data disclosed that FIM score obtained at the time of discharge from rehabilitation service was best predicted by two variables, time since brain injury and the FIM score at admission (multiple R=0.78, R=0.60, P<0.001). This sample of Turkish TBI survivors showed significant functional improvements after rehabilitation and admission functional status and the time since TBI had the most impact on discharge functional outcome.     

Pulmonary artery catheter use is associated with reduced mortality in severely injured patients: a National Trauma Data Bank analysis of 53,312 patients

OBJECTIVE: To evaluate the association between pulmonary artery catheter (PAC) use and mortality in a large cohort of injured patients. We hypothesized that PAC use is associated with improved survival in critically injured trauma patients. DESIGN: Retrospective database analysis. SETTING: A total of 268 level 1 trauma centers from across the United States. PATIENTS: A total of 53,312 patients admitted to the intensive care units of the trauma centers participating in the National Trauma Data Bank maintained by the American College of Surgeons. MEASUREMENTS AND MAIN RESULTS: The National Trauma Data Bank was queried to identify patients aged 16-90 yrs with complete data on base deficit, and Injury Severity Score (n=53,312). Patients were initially divided into two groups: those managed with a PAC (n=1,933) and those managed without a PAC (n=51,379). Chi-square and Student's t-test analysis were utilized to explore group differences in mortality. In a second analysis, groups were stratified by base deficit, Injury Severity Score, and age to further explore the influence of injury severity on PAC use and mortality. In addition, a logistic regression model was developed to assess the relationship between PAC use and mortality after adjusting for differences in age, mechanism, injury severity, injury pattern, and co-morbidities. Overall, patients managed with a PAC were older (45.8+/-21.3 yrs), had higher Injury Severity Score (28.4+/-13.5), worse base deficit (-5.2+/-6.5), and increased mortality (PAC, 29.7%; no PAC, 9.8%; p<.001). However, after stratification for injury severity, PAC use was associated with a survival benefit in four subgroups of patients. Each of these groups had advanced age or increased injury severity. Specifically, patients aged 61-90 yrs, with arrival base deficit worse than -11 and Injury Severity Score of 25-75, had a decrease in the risk of death with PAC use (odds ratio, 0.33; 95% confidence interval, 0.17-0.62). Three additional groups had a similar decrease in the risk of death with PAC use: odds ratio, 0.60 (95% confidence interval, 0.43-0.83), 0.82 (95% confidence interval, 0.44-1.52), and 0.63 (95% confidence interval, 0.40-0.98). Logistic regression analysis demonstrated a decreased mortality when a PAC was used in the management of patients with the following severe injury characteristics: Injury Severity Score of 25-75, base deficit of less than -11, or age of 61-90 yrs (odds ratio, 0.593; 95% confidence interval, 0.437-0.805). CONCLUSIONS: Trauma patients managed with a PAC are more severely injured and have a higher mortality. However, severely injured patients (Injury Severity Score, 25-75) who arrive in severe shock, and older patients, have an associated survival benefit when managed with a PAC. This is the first study to demonstrate a benefit of PAC use in trauma patients.     

Sleep and pain complaints in symptomatic traumatic brain injury and neurologic populations

Objective: To compare the incidence of sleep and pain complaints in symptomatic traumatic brain injury (TBI) (mild vs moderate/severe) and neurologic populations.Design: Case-control study.Setting: Outpatient neuropsychology service at a university-affiliated tertiary care center.Patients: A consecutive sample of mild (n = 127) and moderate to severe (n = 75) patients with TBI and a general neurologic (non-TBI) group (n = 123) referred for neuropsychological assessment.Main Outcome Measures: Patient report of sleep and/or pain problems.Results: TBI subjects had significantly more insomnia (56.4% vs 30.9%) and pain complaints (58.9% vs 22%) than non-TBI subjects (p < .0001). For both subject groups, the presence of pain increased insomnia approximately twofold. Poor sleep maintainance was the most common sleep problem. In those subjects without pain, TBI patients reported more sleep complaints that non-TBI patients (p = .05). Mild TBI patients reported significantly (p < .0001) more pain than patients with a moderate to severe injury (70% vs 40%). In TBI subjects without pain, there were significantly more insomnia complaints in mild than in moderate to severe injuries (p < .01).Conclusions: TBI patients with persistent cognitve complaints have more sleep and pain concerns than general neurologic patients. Pain is strongly associated with sleep problems. Aggressive evaluation and treatment of pain and sleep problems in the TBI, especially mild TBI, population appears warranted and may contribute to increased disability. The etiology of greater sleep and pain problems in the mild than in the more severe TBI patients requires further study.     

Employment outcome four years after a severe traumatic brain injury: results of the Paris severe traumatic brain injury study

Objective: To describe employment outcome four years after a severe traumatic brain injury by the assessment of individual patients’ preinjury sociodemographic data, injury-related and postinjury factors.

Design: A prospective, multicenter inception cohort of 133 adult patients in the Paris area (France) who had received a severe traumatic brain injury were followed up postinjury at one and four years. Sociodemographic data, factors related to injury severity and one-year functional and cognitive outcomes were prospectively collected.

Methods: The main outcome measure was employment status. Potential predictors of employment status were assessed by univariate and multivariate analysis.

Results: At the four-year follow-up, 38% of patients were in paid employment. The following factors were independent predictors of unemployment: being unemployed or studying before traumatic brain injury, traumatic brain injury severity (i.e., a lower Glasgow Coma Scale score upon admission and a longer stay in intensive care) and a lower one-year Glasgow Outcome Scale–Extended score.

Conclusion: This study confirmed the low rate of long-term employment amongst patients after a severe traumatic brain injury. The results illustrated the multiple determinants of employment outcome and suggested that students who had received a traumatic brain injury were particularly likely to be unemployed, thus we propose that they may require specific support to help them find work.

• Implications for rehabilitation

• Traumatic brain injury is a leading cause of persistent disablity and can associate cognitive, emotional, physical and sensory impairments, which often result in quality-of-life reduction and job loss.

• Predictors of post-traumatic brain injury unemployment and job loss remains unclear in the particular population of severe traumatic brain injury patients.

• The present study highlights the post-traumatic brain injury student population require a close follow-up and vocational rehabilitation.

• The study suggests that return to work post-severe traumatic brain injury is frequently unstable and workers often experience difficulties that caregivers have to consider.

     

Impact of non-neurological complications in severe traumatic brain injury outcome

ABSTRACT: INTRODUCTION: Non-neurological complications in patients with severe traumatic brain injury (TBI) are frequent, worsening the prognosis, but the pathophysiology of systemic complications after TBI is unclear. The purpose of this study was to analyze non-neurological complications in patients with severe TBI admitted to the ICU, the impact of these complications on mortality, and their possible correlation with TBI severity. METHODS: An observational retrospective cohort study was conducted in one multidisciplinary ICU of a university hospital (35 beds); 224 consecutive adult patients with severe TBI (initial Glasgow Coma Scale (GCS) < 9) admitted to the ICU were included. Neurological and non-neurological variables were recorded. RESULTS: Sepsis occurred in 75% of patients, respiratory infections in 68%, hypotension in 44%, severe respiratory failure (arterial oxygen pressure/oxygen inspired fraction ratio (PaO2/FiO2) < 200) in 41% and acute kidney injury (AKI) in 8%. The multivariate analysis showed that Glasgow Outcome Score (GOS) at one year was independently associated with age, initial GCS 3 to 5, worst Traumatic Coma Data Bank (TCDB) first computed tomography (CT) scan and the presence of intracranial hypertension but not AKI. Hospital mortality was independently associated with initial GSC 3 to 5, worst TCDB first CT scan, the presence of intracranial hypertension and AKI. The presence of AKI regardless of GCS multiplied risk of death 6.17 times (95% confidence interval (CI): 1.37 to 27.78) (P < 0.02), while ICU hypotension increased the risk of death in patients with initial scores of 3 to5 on the GCS 4.28 times (95% CI: 1.22 to15.07) (P < 0.05). CONCLUSIONS: Low initial GCS, worst first CT scan, intracranial hypertension and AKI determined hospital mortality in severe TBI patients. Besides the direct effect of low GCS on mortality, this neurological condition also is associated with ICU hypotension which increases hospital mortality among patients with severe TBI. These findings add to previous studies that showed that non-neurological complications increase the length of stay and morbidity in the ICU but do not increase mortality, with the exception of AKI and hypotension in low GCS (3 to 5).     

Effects of non-neurological complications on traumatic brain injury outcome

ABSTRACT: Traumatic brain injury (TBI) affects over 1.5 million Americans annually and consumes a significant amount of healthcare dollars. Identification of complications and factors that impact recovery from TBI is important in improving outcome and allocating appropriate resources. Understanding the role of non-neurologic complications such as sepsis, acute kidney injury, and respiratory problems on TBI outcome and mortality is critical.     

Successful outcome in severe traumatic brain injury: a case study.

This case study describes the management of a 54-year-old male who presented to the Hospital of the University of Pennsylvania (HUP) with a traumatic brain injury (TBI) after being assaulted. He underwent an emergent bifrontal decompressive hemicraniectomy for multiple, severe frontal contusions. His postoperative course included monitoring of intracranial pressure, cerebral perfusion pressure, partial pressure of brain oxygen, brain temperature, and medical management based on HUP's established TBI algorithm. This case study explores the potential benefit of combining multimodality monitoring and TBI guidelines in the management of severe TBI.     

Coagulopathy as a predictor of mortality after penetrating traumatic brain injury

Study hypothesis

Traumatic brain injury (TBI) is a leading cause of mortality with penetrating TBI (p-TBI) patients having worse outcomes. These patients are more likely to be coagulopathic than blunt TBI (b-TBI) patients, thus we hypothesize that coagulopathy would be an early predictor of mortality.