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https://www.readbyqxmd.com/read/28638364/impact-of-neuronal-membrane-damage-on-the-local-field-potential-in-a-large-scale-simulation-of-cerebral-cortex
#1
David L Boothe, Alfred B Yu, Pawel Kudela, William S Anderson, Jean M Vettel, Piotr J Franaszczuk
Within multiscale brain dynamics, the structure-function relationship between cellular changes at a lower scale and coordinated oscillations at a higher scale is not well understood. This relationship may be particularly relevant for understanding functional impairments after a mild traumatic brain injury (mTBI) when current neuroimaging methods do not reveal morphological changes to the brain common in moderate to severe TBI such as diffuse axonal injury or gray matter lesions. Here, we created a physiology-based model of cerebral cortex using a publicly released modeling framework (GEneral NEural SImulation System) to explore the possibility that performance deficits characteristic of blast-induced mTBI may reflect dysfunctional, local network activity influenced by microscale neuronal damage at the cellular level...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28634442/mild-traumatic-brain-injury-evokes-pyramidal-neuron-axon-initial-segment-plasticity-and-diffuse-presynaptic-inhibitory-terminal-loss
#2
Michal Vascak, Jianli Sun, Matthew Baer, Kimberle M Jacobs, John T Povlishock
The axon initial segment (AIS) is the site of action potential (AP) initiation, thus a crucial regulator of neuronal activity. In excitatory pyramidal neurons, the high density of voltage-gated sodium channels (NaV1.6) at the distal AIS regulates AP initiation. A surrogate AIS marker, ankyrin-G (ankG) is a structural protein regulating neuronal functional via clustering voltage-gated ion channels. In neuronal circuits, changes in presynaptic input can alter postsynaptic output via AIS structural-functional plasticity...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28633999/characteristics-of-a-mild-traumatic-brain-injury-sample-recruited-using-amazon-s-mechanical-turk
#3
John Bernstein, Matthew Calamia
BACKGROUND: Several barriers exist in the recruitment of individuals with a history of mild traumatic brain injury (mTBI). The current study is the first to examine whether crowdsourcing, which has been used in other clinical populations, is useful in the recruitment of those with mTBI. OBJECTIVE: To examine whether Amazon's Mechanical Turk (MTurk), an online crowdsourcing platform, is a useful tool in the recruitment of individuals with a history of mild traumatic brain injury (mTBI) and to examine the injury and psychological characteristics of individuals who report a history of mTBI...
June 17, 2017: PM & R: the Journal of Injury, Function, and Rehabilitation
https://www.readbyqxmd.com/read/28630809/technical-report-of-the-use-of-a-novel-eye-tracking-system-to-measure-impairment-associated-with-mild-traumatic-brain-injury
#4
Michael Kelly
This technical report details the results of an uncontrolled study of EyeGuide Focus, a 10-second concussion management tool which relies on eye tracking to determine the potential impairment of visual attention, an indicator often of mild traumatic brain injury (mTBI). Essentially, people who can visually keep steady and accurate attention on a moving object in their environment likely suffer from no impairment. However, if after a potential mTBI event, subjects cannot keep attention on a moving object in a normal way as demonstrated on their previous healthy baseline tests...
May 15, 2017: Curēus
https://www.readbyqxmd.com/read/28627942/diffusion-imaging-of-mild-traumatic-brain-injury-in-the-impact-accelerated-rodent-model-a-pilot-study
#5
Zora Kikinis, Marc Muehlmann, Ofer Pasternak, Sharon Peled, Praveen Kulkarni, Craig Ferris, Sylvain Bouix, Yogesh Rathi, Inga K Koerte, Steve Pieper, Alexander Yarmarkovich, Caryn L Porter, Bruce S Kristal, Martha E Shenton
PRIMARY OBJECTIVE: There is a need to understand pathologic processes of the brain following mild traumatic brain injury (mTBI). Previous studies report axonal injury and oedema in the first week after injury in a rodent model. This study aims to investigate the processes occurring 1 week after injury at the time of regeneration and degeneration using diffusion tensor imaging (DTI) in the impact acceleration rat mTBI model. RESEARCH DESIGN: Eighteen rats were subjected to impact acceleration injury, and three rats served as sham controls...
June 19, 2017: Brain Injury: [BI]
https://www.readbyqxmd.com/read/28619545/blast-related-disinhibition-and-risk-seeking-in-mice-and-combat-veterans-potential-role-for-dysfunctional-phasic-dopamine-release
#6
A G Schindler, J S Meabon, K F Pagulayan, R C Hendrickson, K D Meeker, M Cline, G Li, C Sikkema, C W Wilkinson, D P Perl, M R Raskind, E R Peskind, J J Clark, D G Cook
Mild traumatic brain injury (mTBI) caused by exposure to high explosives has been called the "signature injury" of the wars in Iraq and Afghanistan. There is a wide array of chronic neurological and behavioral symptoms associated with blast-induced mTBI. However, the underlying mechanisms are not well understood. Here we used a battlefield-relevant mouse model of blast-induced mTBI and in vivo fast-scan cyclic voltammetry (FSCV) to investigate whether the mesolimbic dopamine system contributes to the mechanisms underlying blast-induced behavioral dysfunction...
June 12, 2017: Neurobiology of Disease
https://www.readbyqxmd.com/read/28611614/functional-and-structural-network-recovery-after-mild-traumatic-brain-injury-a-1-year-longitudinal-study
#7
Patrizia Dall'Acqua, Sönke Johannes, Ladislav Mica, Hans-Peter Simmen, Richard Glaab, Javier Fandino, Markus Schwendinger, Christoph Meier, Erika J Ulbrich, Andreas Müller, Hansruedi Baetschmann, Lutz Jäncke, Jürgen Hänggi
Brain connectivity after mild traumatic brain injury (mTBI) has not been investigated longitudinally with respect to both functional and structural networks together within the same patients, crucial to capture the multifaceted neuropathology of the injury and to comprehensively monitor the course of recovery and compensatory reorganizations at macro-level. We performed a prospective study with 49 mTBI patients at an average of 5 days and 1 year post-injury and 49 healthy controls. Neuropsychological assessments as well as resting-state functional and diffusion-weighted magnetic resonance imaging were obtained...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28606462/growing-literature-but-limited-evidence-a-systematic-review-regarding-prebiotic-and-probiotic-interventions-for-those-with-traumatic-brain-injury-and-or-posttraumatic-stress-disorder
#8
Lisa A Brenner, Kelly A Stearns-Yoder, Adam S Hoffberg, Molly E Penzenik, Amy J Starosta, Theresa D Hernández, Daniel A Hadidi, Christopher A Lowry
Traumatic brain injury (TBI) is highly prevalent among a wide-range of populations, including civilians, military personnel, and Veterans. TBI sequelae may be further exacerbated by symptoms associated with frequently occurring co-morbid psychiatric conditions including posttraumatic stress disorder (PTSD). This is particularly true among the population of military personnel from recent conflicts in Iraq and Afghanistan with a history of mild TBI (mTBI) and PTSD. The need for efficacious treatments for TBI and co-morbid PTSD is significant, and evidence-based interventions for these frequently co-occurring conditions are limited...
June 9, 2017: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/28604837/dynamic-changes-in-diffusion-measures-improve-sensitivity-in-identifying-patients-with-mild-traumatic-brain-injury
#9
Alexander W Thomas, Richard Watts, Christopher G Filippi, Joshua P Nickerson, Trevor Andrews, Gregory Lieberman, Magdalena R Naylor, Margaret J Eppstein, Kalev Freeman
The goal of this study was to investigate patterns of axonal injury in the first week after mild traumatic brain injury (mTBI). We performed a prospective cohort study of 20 patients presenting to the emergency department with mTBI, using 3.0T diffusion tensor MRI immediately after injury and again at 1 week post-injury. Corresponding data were acquired from 16 controls over a similar time interval. Fractional anisotropy (FA) and other diffusion measures were calculated from 11 a priori selected axon tracts at each time-point, and the change across time in each region was quantified for each subject...
2017: PloS One
https://www.readbyqxmd.com/read/28602630/correlation-between-standardized-assessment-of-concussion-scores-and-small-world-brain-network-in-mild-traumatic-brain-injury
#10
Yan Yan, Jian Song, Guozheng Xu, Shun Yao, Chenglong Cao, Chang Li, Guibao Peng, Hao Du
This study investigated the characteristics of the small-world brain network architecture of patients with mild traumatic brain injury (MTBI), and a correlation between brain functional connectivity network properties in the resting-state fMRI and Standardized Assessment of Concussion (SAC) parameters. The neurological conditions of 22 MTBI patients and 17 normal control individuals were evaluated according to the SAC. Resting-state fMRI was performed in all subjects 3 and 7days after injury respectively. After preprocessing the fMRI data, cortex functional regions were marked using AAL90 and Dosenbach160 templates...
June 8, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28599608/a-brain-electrical-activity-eeg-based-biomarker-of-functional-impairment-in-traumatic-head-injury-a-multisite-validation-trial
#11
Daniel Hanley, Leslie S Prichep, Neeraj Badjatia, Jeff Bazarian, RIchard P Chiacchierini, Kenneth C Curley, John S Garrett, Elizabeth B Jones, Rosanne Naunheim, Brian J O'Neil, John O'Neill, Wright David, J Stephen Huff
The potential clinical utility of a novel quantitative EEG-based Brain Function Index (BFI) as a measure of the presence and severity of functional brain injury was studied as part of an independent prospective validation trial. The BFI was derived using EEG features associated with functional brain impairment reflecting current consensus on the physiology of concussive injury. 720 adult patients (18-85 years) evaluated within 72 hours of sustaining a closed head injury were enrolled at 11 US Emergency Departments...
June 9, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28595276/premorbid-iq-predicts-postconcussive-symptoms-in-oef-oif-ond-veterans-with-mtbi
#12
Jada J Stewart-Willis, Daniel Heyanka, Zoe Proctor-Weber, Heather England, Maya Bruhns
Objective: Extant literature has demonstrated that symptoms of postconcussive syndrome (PCS) persist well beyond the expected 3-month post-injury recovery period in a minority of individuals with mild traumatic brain injury (mTBI). Suboptimal performance on validity measures and pre- and post-injury psychosocial stressors - rather than actual mTBI or current cognitive functioning - have been identified as predictors of chronic PCS. Whether premorbid IQ has any influence on chronic PCS has been understudied, in the context of established psychogenic etiologies...
June 8, 2017: Archives of Clinical Neuropsychology: the Official Journal of the National Academy of Neuropsychologists
https://www.readbyqxmd.com/read/28593091/a-comprehensive-instrument-for-evaluating-mild-traumatic-brain-injury-mtbi-concussion-in-independent-adults-a-pilot-study
#13
Amanda Borges, Scot Raab, Monica Lininger
BACKGROUND: One common component of concussion rehabilitation is a computerized cognitive test free of concomitant physical demands. Healthcare professionals may be able to provide more patient-centered care after a diagnosed concussion if specific areas of impairment are identified and treated, such as the physical aspect of neurocognitive function. Hypothesis/Purpose: To evaluate the test-retest reliability of a unique combination of neurocognitive assessment tools currently utilized in concussion assessments into one single, inclusive instrument that measures both neurocognitive function and physical capability...
June 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28583464/psychometric-properties-of-two-participation-measures-in-veterans-with-mild-traumatic-brain-injury
#14
Pey-Shan Wen, J Kay Waid-Ebbs, David P Graham, Drew A Helmer
OBJECTIVE: To compare the psychometric properties of two commonly used participation measures: the Community Reintegration of Service Members (CRIS) and the Participation Assessment with Recombined Tools-Objective (PART-O) in Veterans with mild traumatic brain injury (mTBI). DESIGN: The data were collected from two cross-sectional observation studies conducted in two Veterans Affairs medical centers. SETTING: Questionnaires were completed in-person or by mail...
June 2, 2017: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/28579327/manipulating-cognitive-reserve-pre-injury-environmental-conditions-influence-the-severity-of-concussion-symptomology-gene-expression-and-response-to-melatonin-treatment-in-rats
#15
Glenn R Yamakawa, Sabrina Salberg, Karen M Barlow, Brian L Brooks, Michael J Esser, Keith Owen Yeates, Richelle Mychasiuk
In an effort to understand the factors that contribute to heterogeneity in outcomes often associated with mTBI in youth, this study examined the role of premorbid differences in cognitive reserve on post-concussive symptoms (PCS), molecular markers, and treatment response. Male and female rats matured in one of three environmental conditions (Stress, Enrichment, Control), received a mTBI in adolescence, and were randomized to melatonin or placebo treatment. All animals underwent a behavioural test battery designed to examine PCS...
June 1, 2017: Experimental Neurology
https://www.readbyqxmd.com/read/28576727/reconfiguration-of-dominant-coupling-modes-in-mild-traumatic-brain-injury-mediated-by-%C3%AE-band-activity-a-resting-state-meg-study
#16
Marios Antonakakis, Stavros I Dimitriadis, Michalis Zervakis, Andrew C Papanicolaou, George Zouridakis
During the last few years, rich-club (RC) organization has been studied as a possible brain-connectivity organization model for large-scale brain networks. At the same time, empirical and simulated data of neurophysiological models have demonstrated the significant role of intra-frequency and inter-frequency coupling among distinct brain areas. The current study investigates further the importance of these couplings using recordings of resting-state magnetoencephalographic activity obtained from 30 mild traumatic brain injury (mTBI) subjects and 50 healthy controls...
May 31, 2017: Neuroscience
https://www.readbyqxmd.com/read/28558476/evaluation-of-touchscreen-chambers-to-assess-cognition-in-adult-mice-effect-of-training-and-mild-traumatic-brain-injury
#17
Jessica N Nichols, Kenton L Hagan, Candace L Floyd
Cognitive impairments are often experienced following a mild traumatic brain injury (mTBI). In the clinical arena, neuropsychological assessments are frequently used to detect cognitive deficits. However, animal models of mTBI rely on an assortment of behavioral tasks to assess cognitive outcome. Computer-based touchscreen systems have been developed for rodents and are hypothesized to offer a translational approach to evaluate cognitive function due to the similarities of tasks performed in rodents to those implemented in humans...
May 30, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28557049/left-dorsolateral-prefrontal-cortex-rtms-in-alleviating-mtbi-related-headaches-and-depressive-symptoms
#18
Albert Leung, Valerie Metzger-Smith, Yifan He, James Cordero, Brandon Ehlert, David Song, Lisa Lin, Golshan Shahrokh, Alice Tsai, Michael Vaninetti, Thomas Rutledge, Greg Polston, Robert Sheu, Roland Lee
OBJECTIVE: Persistent mild traumatic brain injury related headache (MTBI-HA) represents a neuropathic pain state. This study tested the hypothesis that repetitive transcranial magnetic stimulation (rTMS) at the left prefrontal cortex can alleviate MTBI-HA and associated neuropsychological dysfunctions. METHODS AND MATERIALS: Veterans with MTBI-HA were randomized to receive four sessions of either real (REAL group) or sham (SHAM group) high frequency rTMS delivered at 10 Hz, 80% of resting motor threshold and 2000 pulses per session at >24 and <72 hours apart...
May 30, 2017: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/28539077/clinical-utility-of-the-mbias-and-nsi-validity-10-to-detect-symptom-over-reporting-following-mild-tbi-a-multicenter-investigation-with-military-service-members
#19
Patrick Armistead-Jehle, Douglas B Cooper, Chad E Grills, Wesley R Cole, Sara M Lippa, Robert L Stegman, Rael T Lange
Self-report measures are commonly relied upon in military healthcare environments to assess service members following a mild traumatic brain injury (mTBI). However, such instruments are susceptible to over-reporting and rarely include validity scales. This study evaluated the utility of the mild Brain Injury Atypical Symptoms scale (mBIAS) and the Neurobehavioral Symptom Inventory Validity-10 scale to detect symptom over-reporting. A total of 359 service members with a reported history of mTBI were separated into two symptom reporting groups based on MMPI-2-RF validity scales (i...
May 25, 2017: Journal of Clinical and Experimental Neuropsychology
https://www.readbyqxmd.com/read/28529912/female-gonadal-hormone-effects-on-microglial-activation-and-functional-outcomes-in-a-mouse-model-of-moderate-traumatic-brain-injury
#20
Odera Umeano, Haichen Wang, Hana Dawson, Beilei Lei, Afoma Umeano, Dawn Kernagis, Michael L James
AIM: To address the hypothesis that young, gonad-intact female mice have improved long-term recovery associated with decreased neuroinflammation compared to male mice. METHODS: Eight to ten week-old male, female, and ovariectomized (OVX) mice underwent closed cranial impact. Gonad-intact female mice were injured only in estrus state. After injury, between group differences were assessed using complementary immunohistochemical staining for microglial cells at 1 h, mRNA polymerase chain reaction for inflammatory markers at 1 h after injury, Rotarod over days 1-7, and water maze on days 28-31 after injury...
May 4, 2017: World Journal of Critical Care Medicine
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