Updated clinical practice guidelines for concussion/mild traumatic brain injury and persistent symptoms

Cerebrospinal Fluid Chemokine (C-C Motif) Ligand 2 Is an Early-Response Biomarker for Blast-Overpressure-Wave-Induced Neurotrauma in Rats

Chemokines and their receptors are of great interest within the milieu of immune responses elicited in the central nervous system in response to trauma. Chemokine (C-C motif)) ligand 2 (CCL2), which is also known as monocyte chemotactic protein-1, has been implicated in the pathogenesis of traumatic brain injury (TBI), brain ischemia, Alzheimer's disease, and other neurodegenerative diseases. In this study, we investigated the time course of CCL2 accumulation in cerebrospinal fluid (CSF) after exposures to single and repeated blast overpressures of varied intensities along with the neuropathological changes and motor deficits resulting from these blast conditions. Significantly increased concentrations of CCL2 in CSF were evident by 1 h of blast exposure and persisted over 24 h with peak levels measured at 6 h post-injury. The increased levels of CCL2 in CSF corresponded with both the number and intensities of blast overpressure and were also commensurate with the extent of neuromotor impairment and neuropathological abnormalities resulting from these exposures. CCL2 levels in CSF and plasma were tightly correlated with levels of CCL2 messenger RNA in cerebellum, the brain region most consistently neuropathologically disrupted by blast. In view of the roles of CCL2 that have been implicated in multiple neurodegenerative disorders, it is likely that the sustained high levels of CCL2 and the increased expression of its main receptor, CCR2, in the brain after blast may similarly contribute to neurodegenerative processes after blast exposure. In addition, the markedly elevated concentration of CCL2 in CSF might be a candidate early-response biomarker for diagnosis and prognosis of blast-induced TBI.

Treatment of persistent post-concussion syndrome due to mild traumatic brain injury: current status and future directions

Persistent post-concussion syndrome caused by mild traumatic brain injury has become a major cause of morbidity and poor quality of life. Unlike the acute care of concussion, there is no consensus for treatment of chronic symptoms. Moreover, most of the pharmacologic and non-pharmacologic treatments have failed to demonstrate significant efficacy on both the clinical symptoms as well as the pathophysiologic cascade responsible for the permanent brain injury. This article reviews the pathophysiology of PCS, the diagnostic tools and criteria, the current available treatments including pharmacotherapy and different cognitive rehabilitation programs, and promising new treatment directions. A most promising new direction is the use of hyperbaric oxygen therapy, which targets the basic pathological processes responsible for post-concussion symptoms; it is discussed here in depth.

Prognostic Indicators of Persistent Post-Concussive Symptoms after Deployment-Related Mild Traumatic Brain Injury: A Prospective Longitudinal Study in U.S. Army Soldiers

Mild traumatic brain injury (mTBI), or concussion, is prevalent in the military. The course of recovery can be highly variable. This study investigates whether deployment-acquired mTBI is associated with subsequent presence and severity of post-concussive symptoms (PCS) and identifies predictors of persistent PCS among US Army personnel who sustained mTBI while deployed to Afghanistan. We used data from a prospective longitudinal survey of soldiers assessed 1-2 months before a 10-month deployment to Afghanistan (T0), on redeployment to the United States (T1), approximately 3 months later (T2), and approximately 9 months later (T3). Outcomes of interest were PCS at T2 and T3. Predictors considered were: sociodemographic factors, number of previous deployments, pre-deployment mental health and TBI history, and mTBI and other military-related stress during the index deployment. The study sample comprised 4518 soldiers, 822 (18.2%) of whom experienced mTBI during the index deployment. After adjusting for demographic, clinical, and deployment-related factors, deployment-acquired mTBI was associated with nearly triple the risk of reporting any PCS and with increased severity of PCS when symptoms were present. Among those who sustained mTBI, severity of PCS at follow-up was associated with history of pre-deployment TBI(s), pre-deployment psychological distress, more severe deployment stress, and loss of consciousness or lapse of memory (versus being "dazed" only) as a result of deployment-acquired mTBI. In summary, we found that sustaining mTBI increases risk for persistent PCS. Previous TBI(s), pre-deployment psychological distress, severe deployment stress, and loss of consciousness or lapse of memory resulting from mTBI(s) are prognostic indicators of persistent PCS after an index mTBI. These observations may have actionable implications for prevention of chronic sequelae of mTBI in the military and other settings.

Efficacy and acceptability of a home-based, family-inclusive intervention for veterans with TBI: A randomized controlled trial

OBJECTIVE

Traumatic brain injury (TBI) often undermines community re-integration, impairs functioning and produces other symptoms. This study tested an innovative programme for veterans with TBI, the Veterans' In-home Programme (VIP), delivered in veterans' homes, involving a family member and targeting the environment (social and physical) to promote community re-integration, mitigate difficulty with the most troubling TBI symptoms and facilitate daily functioning.

SETTING

Interviews and intervention sessions were conducted in homes or by telephone.

PARTICIPANTS

Eighty-one veterans with TBI at a VA polytrauma programme and a key family member.

DESIGN

This was a 2-group randomized controlled trial. Control-group participants received usual-care enhanced by two attention-control telephone calls. Follow-up interviews occurred up to 4 months after baseline interview.

MAIN MEASURES

VIP's efficacy was evaluated using measures of community re-integration, target outcomes reflecting veterans' self-identified problems and self-rated functional competence.

RESULTS

At follow-up, VIP participants had significantly higher community re-integration scores and less difficulty managing targeted outcomes, compared to controls. Self-rated functional competence did not differ between groups. In addition, VIP's acceptability was high.

CONCLUSION

A home-based, family-inclusive service for veterans with TBI shows promise for improving meaningful outcomes and warrants further research and clinical application.

Are GLP-1 receptor agonists useful against traumatic brain injury?

This Editorial highlights a study by Li et al. (2015) in the current issue of J. Neurochem. The image depicts the hypothesized neuroprotective pathway that is proposed by the authors. Using a combination of SH-SY5Y and primary rat neuron cultures the GLP-1R agonist, Liraglutide, was shown to increase SH-SY5Y proliferation and CREB phosphorylation correlating with reduced toxicity, preservation of Bcl2 protein levels, and decreased caspase 3 activity following glutamate or H2 O2 stimulations. These in vitro observations correlated with a Liraglutide-dependent improvement in memory performance in mice subjected to a mild TBI. Bcl2, B-cell lymphoma 2; CREB, cAMP-response element binding protein; GLP-1R, glucagon-like peptide 1 receptor; TBI, traumatic brain injury; PKA, protein kinase A.