Journal of neurotrauma
-
Journal of neurotrauma · Feb 2021
Association of Head Impact Exposure with White Matter Macro- and Microstructure Metrics.
Prior studies have reported white matter abnormalities associated with a history of cumulative concussion and/or repetitive head impacts (RHI) in contact sport athletes. Growing evidence suggests these abnormalities may begin as more subtle changes earlier in life in active younger athletes. We investigated the relationship between prior concussion and contact sport exposure with multi-modal white matter microstructure and macrostructure using magnetic resonance imaging. ⋯ Concussion history was not significantly associated with QSM, DTI, DKI, or white matter volume (all, p 0.05). Cumulative contact sport exposure is associated with subtle differences in white matter microstructure, but not gross white matter macrostructure, in young active athletes. Longitudinal follow-up is required to assess the progression of these findings to determine their contribution to potential adverse effects later in life.
-
Journal of neurotrauma · Feb 2021
Provider Perspectives on Early Psychosocial Interventions after Pediatric Severe Traumatic Brain Injury: an Implementation Framework.
This study created a framework incorporating provider perspectives of best practices for early psychosocial intervention to improve caregiver experiences and outcomes after severe pediatric traumatic brain injury (TBI). A purposive sample of 23 healthcare providers from the emergency, intensive care, and acute care departments, was selected based on known clinical care of children with severe TBI at a level 1 trauma center and affiliated children's hospital. Semistructured interviews and directed content analysis were used to assess team and caregiver communication processes and topics, prognostication, and recommended interventions. ⋯ Specific family-centered and trauma-informed interventions included: (1) creating and sharing interdisciplinary plans with caregivers, (2) coordinating prognostication meetings and communications, (3) tracking family education, (4) improving institutional coordination and workflow, (5) training caregivers to support family involvement, (6) performing biopsychosocial assessment, and (7) using systematic prompts for difficult conversations and to address family needs at regular intervals. Healthcare workers from a variety of disciplines want to incorporate certain trauma-informed and family-centered practices at each stage of treatment to improve experiences for caregivers and outcomes for pediatric patients with severe TBI. Future research should test the feasibility and effectiveness of incorporating routine psychosocial interventions for these patients.
-
Journal of neurotrauma · Feb 2021
Longitudinal characterization of blood-brain barrier permeability after experimental traumatic brain injury by in vivo 2-photon microscopy.
Vasogenic brain edema (VBE) formation remains an important factor determining the fate of patients with traumatic brain injury (TBI). The spatial and temporal development of VBE, however, remains poorly understood because of the lack of sufficiently sensitive measurement techniques. To close this knowledge gap, we directly visualized the full time course of vascular leakage after TBI by in vivo 2-photon microscopy (2-PM). ⋯ The rate of extravasation showed a biphasic pattern, peaking 4 h and 48-72 h after trauma. Taken together, longitudinal quantification of vascular leakage after TBI in vivo demonstrates that VBE formation after TBI develops in a biphasic manner suggestive of acute and delayed mechanisms. Further studies using the currently developed dynamic in vivo imaging modalities are needed to investigate these mechanisms and potential therapeutic strategies in more detail.
-
Journal of neurotrauma · Feb 2021
Effects of norepinephrine, propofol and hemoglobin concentration on dynamic measurements of cerebrovascular reactivity in acute brain injury.
Effects of treatment-associated variables on cerebrovascular autoregulation (CA) in acute brain injury patients remain unclear. As deficient CA is associated with worse outcomes and ideas about CA-steered management are emerging, this question is relevant. We investigated effects of norepinephrine and propofol infusion rates and hemoglobin concentration on dynamic measurements of cerebrovascular reactivity as surrogate for CA. ⋯ No significant differences as function of age, gender, cardiovascular risk, brain comorbidity, GCS, pupil reactivity, and type of injury were found. Dynamic intracranial pressure-based measurements of cerebrovascular reactivity in acute brain injured patients are not affected by gradually adjusted norepinephrine or propofol infusion rates or slow changes in hemoglobin concentration within the typical ranges during ICU admission. Future trials on cerebrovascular reactivity-steered management and treatment of CA impairment may not have to take these variables into account.
-
Journal of neurotrauma · Feb 2021
Single mild traumatic brain injury deteriorates progressive inter-hemispheric functional and structural connectivity.
The present study examined dynamic interhemispheric structural and functional connectivity in mild traumatic brain injury (mTBI) patients with longitudinal observations from early subacute to chronic stages within 1 year of injury. Forty-two mTBI patients and 42 matched healthy controls underwent clinical and neuropsychological evaluations, diffusion tensor imaging, and resting-state functional magnetic resonance imaging. All mTBI patients were initially evaluated within 14 d post-injury (T-1) and at 3 months (T-2) and 6-12 months (T-3) follow-ups. ⋯ Moreover, loss of interhemispheric structural connectivity through the CC corresponded well to regions presenting altered interhemispheric functional connectivity. Decreased functional connectivity in the dorsolateral prefrontal cortex thereafter contributed to poor executive function in mTBI patients. The current study provides further evidence that the CC is a sign to interhemispheric highways underpinning the widespread cerebral pathology typifying mTBI syndrome.