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Diffuse axonal injury

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https://www.readbyqxmd.com/read/29149383/diffusion-mri-in-pediatric-brain-injury
#1
Emily L Dennis, Talin Babikian, Christopher C Giza, Paul M Thompson, Robert F Asarnow
Traumatic brain injury (TBI) is a major public health issue around the world and can be especially devastating in children as TBI can derail cognitive and social development. White matter (WM) is particularly vulnerable to disruption post-TBI, as myelination is ongoing during this period. Diffusion magnetic resonance imaging (dMRI) is a versatile modality for identifying and quantifying WM disruption and can detect diffuse axonal injury (DAI or TAI (traumatic axonal injury)). This review covers dMRI studies of pediatric TBI, including mild to severe injuries, and covering all periods post-injury...
October 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/29142631/mortality-and-epidemiology-in-256-cases-of-pediatric-traumatic-brain-injury-korean-neuro-trauma-data-bank-system-kntdbs-2010-2014
#2
Hee-Won Jeong, Seung-Won Choi, Jin-Young Youm, Jeong-Wook Lim, Hyon-Jo Kwon, Shi-Hun Song
Objective: Among pediatric injury, brain injury is a leading cause of death and disability. To improve outcomes, many developed countries built neurotrauma databank (NTDB) system but there was not established nationwide coverage NTDB until 2009 and there have been few studies on pediatric traumatic head injury (THI) patients in Korea. Therefore, we analyzed epidemiology and outcome from the big data of pediatric THI. Methods: We collected data on pediatric patients from 23 university hospitals including 9 regional trauma centers from 2010 to 2014 and analyzed their clinical factors (sex, age, initial Glasgow coma scale, cause and mechanism of head injury, presence of surgery)...
November 2017: Journal of Korean Neurosurgical Society
https://www.readbyqxmd.com/read/29140952/-don-t-lose-hope-early-hemorrhagic-diffuse-axonal-injury-on-head-ct-is-not-associated-with-poor-outcome-in-moderate-severe-tbi-patients
#3
Nils Henninger, Rebecca A Compton, Muhammad W Khan, Raphael Carandang, Wiley Hall, Susanne Muehlschlegel
BACKGROUND: Diffuse axonal injury (DAI) on MRI has been associated with poor functional outcome after moderate-severe traumatic brain injury (msTBI). Yet, DAI assessment with highly-sensitive MRI-techniques is unfeasible in the acute trauma setting, and CT remains the key diagnostic modality despite its lower sensitivity. We sought to determine whether CT-defined-hemorrhagic-DAI (hDAI) is associated with discharge and favorable 3-and 12-month functional outcome (Glasgow Outcome Score ≥4) after msTBI...
November 14, 2017: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/29124529/eeg-indices-correlate-with-sustained-attention-performance-in-patients-affected-by-diffuse-axonal-injury
#4
Stefania Coelli, Riccardo Barbieri, Gianluigi Reni, Claudio Zucca, Anna Maria Bianchi
The aim of this study is to assess the ability of EEG-based indices in providing relevant information about cognitive engagement level during the execution of a clinical sustained attention (SA) test in healthy volunteers and DAI (diffused axonal injury)-affected patients. We computed three continuous power-based engagement indices (P β /P α , 1/P α , and P β / (P α + P θ )) from EEG recordings in a control group (n = 7) and seven DAI-affected patients executing a 10-min Conners' "not-X" continuous performance test (CPT)...
November 9, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/29108477/hyperthermia-and-mild-traumatic-brain-injury-effects-on-inflammation-and-the-cerebral-vasculature
#5
Jessie Truettner, Helen M Bramlett, W Dalton Dietrich
Mild traumatic brain injury (mTBI) or concussion represents the majority of TBIs brain trauma in the United States. The pathophysiology of mTBI is complex and may include both focal and diffuse injury patterns. In addition to altered circuit dysfunction and diffuse traumatic axonal injury (DTAI), chronic neuroinflammation has also been implicated in the pathophysiology of mTBI. Recently, our laboratory has reported the detrimental effects of mild hyperthermic mTBI in terms of worsening histopathological and behavioral outcomes...
November 6, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/29104116/putative-roles-of-soluble-trophic-factors-in-facial-nerve-regeneration-target-reinnervation-and-recovery-of-vibrissal-whisking
#6
REVIEW
Habib Bendella, Svenja Rink, Maria Grosheva, Levent Sarikcioglu, Tessa Gordon, Doychin N Angelov
It is well-known that, after nerve transection and surgical repair, misdirected regrowth of regenerating motor axons may occur in three ways. The first way is that the axons enter into endoneurial tubes that they did not previously occupy, regenerate through incorrect fascicles and reinnervate muscles that they did not formerly supply. Consequently the activation of these muscles results in inappropriate movements. The second way is that, in contrast with the precise target-directed pathfinding by elongating motor nerves during embryonic development, several axons rather than a single axon grow out from each transected nerve fiber...
November 8, 2017: Experimental Neurology
https://www.readbyqxmd.com/read/29074287/micromechanical-analysis-of-brain-s-diffuse-axonal-injury
#7
Amir Mohammadipour, Alireza Alemi
Computational models are important tools which help researchers understand traumatic brain injury (TBI). A mechanistic multi-scale numerical approach is introduced to quantify diffuse axonal injury (DAI), the most important mechanism of TBI, induced by a mechanical insult at micro-scale regions of the white matter or voxels where fiber orientations are the same. Using the mechanical properties of a single axon with a viscoelastic constitutive relation and its functional failure in terms of electrophysiological impairment, a numerical 2D micro-level lattice method is implemented to directly analyze the percentage of injured axons in a voxel containing a bundle of axons all with the same orientation under biaxial stretches...
October 9, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29070666/multiparametric-mri-changes-persist-beyond-recovery-in-concussed-adolescent-hockey-players
#8
Kathryn Y Manning, Amy Schranz, Robert Bartha, Gregory A Dekaban, Christy Barreira, Arthur Brown, Lisa Fischer, Kevin Asem, Timothy J Doherty, Douglas D Fraser, Jeff Holmes, Ravi S Menon
OBJECTIVE: To determine whether multiparametric MRI data can provide insight into the acute and long-lasting neuronal sequelae after a concussion in adolescent athletes. METHODS: Players were recruited from Bantam hockey leagues in which body checking is first introduced (male, age 11-14 years). Clinical measures, diffusion metrics, resting-state network and region-to-region functional connectivity patterns, and magnetic resonance spectroscopy absolute metabolite concentrations were analyzed from an independent, age-matched control group of hockey players (n = 26) and longitudinally in concussed athletes within 24 to 72 hours (n = 17) and 3 months (n = 14) after a diagnosed concussion...
October 25, 2017: Neurology
https://www.readbyqxmd.com/read/29061970/white-matter-microstructure-is-associated-with-functional-cognitive-and-emotional-symptoms-12-months-after-mild-traumatic-brain-injury
#9
Torgeir Hellstrøm, Lars T Westlye, Tobias Kaufmann, Nhat Trung Doan, Helene L Søberg, Solrun Sigurdardottir, Wibeke Nordhøy, Eirik Helseth, Ole A Andreassen, Nada Andelic
Identifying patients at risk of poor outcome after mild traumatic brain injury (MTBI) is essential to aid prognostics and treatment. Diffuse axonal injury (DAI) may be the primary pathologic feature of MTBI but is normally not detectable by conventional imaging technology. This lack of sensitivity of clinical imaging techniques has impeded a pathophysiologic understanding of the long-term cognitive and emotional consequences of MTBI, which often remain unnoticed and are attributed to factors other than the injury...
October 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29060658/a-3d-model-based-simulation-of-demyelination-to-understand-its-effects-on-diffusion-tensor-imaging
#10
Teddy Salan, Eddie L Jacobs, Wilburn E Reddick
Demyelination is the progressive damage to the myelin sheath, a protective covering that surrounds a nerve's axon. Due to its high sensitivity to microscopic tissue changes, diffusion tensor imaging (DTI) is a powerful means of detecting signs of demyelination and axonal injury. In this paper, we present a 3D virtual model capable of simulating the complex Brownian motion of water molecules in a bundle of myelinated axons and glial cells for the purpose of synthesizing DTI data, characterizing and verifying the impact of demyelination on DTI...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29058589/translational-evidence-for-two-distinct-patterns-of-neuroaxonal-injury-in-sepsis-a-longitudinal-prospective-translational-study
#11
Johannes Ehler, Lucinda K Barrett, Valerie Taylor, Michael Groves, Francesco Scaravilli, Matthias Wittstock, Stephan Kolbaske, Annette Grossmann, Jörg Henschel, Martin Gloger, Tarek Sharshar, Fabrice Chretien, Francoise Gray, Gabriele Nöldge-Schomburg, Mervyn Singer, Martin Sauer, Axel Petzold
BACKGROUND: Brain homeostasis deteriorates in sepsis, giving rise to a mostly reversible sepsis-associated encephalopathy (SAE). Some survivors experience chronic cognitive dysfunction thought to be caused by permanent brain injury. In this study, we investigated neuroaxonal pathology in sepsis. METHODS: We conducted a longitudinal, prospective translational study involving (1) experimental sepsis in an animal model; (2) postmortem studies of brain from patients with sepsis; and (3) a prospective, longitudinal human sepsis cohort study at university laboratory and intensive care units (ICUs)...
October 23, 2017: Critical Care: the Official Journal of the Critical Care Forum
https://www.readbyqxmd.com/read/29053522/immediate-enhancement-of-nerve-function-using-a-novel-axonal-fusion-device-after-neurotmesis
#12
David Colton Riley, Richard B Boyer, Curt A Deister, Alonda C Pollins, Nancy L Cardwell, Nathaniel D Kelm, Mark D Does, Richard D Dortch, Ravinder Bamba, Robert Bruce Shack, Wesley P Thayer
BACKGROUND: The management of peripheral nerve injuries remains a large challenge for plastic surgeons. With the inability to fuse axonal endings, results after microsurgical nerve repair have been inconsistent. Our current nerve repair strategies rely upon the slow and lengthy process of axonal regeneration (~1 mm/d). Polyethylene glycol (PEG) has been investigated as a potential axonal fusion agent; however, the percentage of axonal fusion has been inconsistent. The purpose of this study was to identify a PEG delivery device to standardize outcomes after attempted axonal fusion with PEG...
December 2017: Annals of Plastic Surgery
https://www.readbyqxmd.com/read/29032776/neuropsychological-recovery-trajectories-in-moderate-to-severe-traumatic-brain-injury-influence-of-patient-characteristics-and-diffuse-axonal-injury
#13
Amanda R Rabinowitz, Tessa Hart, John Whyte, Junghoon Kim
OBJECTIVES: The goal of the present study was to elucidate the influence of demographic and neuropathological moderators on the longitudinal trajectory neuropsychological functions during the first year after moderate to severe traumatic brain injury (TBI). In addition to examining demographic moderators such as age and education, we included a measure of whole-brain diffuse axonal injury (DAI), and examined measures of processing speed (PS), executive function (EF), and verbal learning (VL) separately...
October 16, 2017: Journal of the International Neuropsychological Society: JINS
https://www.readbyqxmd.com/read/29028764/the-prognostic-value-of-mri-in-moderate-and-severe-traumatic-brain-injury-a-systematic-review-and-meta-analysis
#14
Hourmazd Haghbayan, Amélie Boutin, Mathieu Laflamme, François Lauzier, Michèle Shemilt, Lynne Moore, Ryan Zarychanski, Vincent Douville, Dean Fergusson, Alexis F Turgeon
OBJECTIVES: Traumatic brain injury is a major cause of death and disability, yet many predictors of outcome are not precise enough to guide initial clinical decision-making. Although increasingly used in the early phase following traumatic brain injury, the prognostic utility of MRI remains uncertain. We thus undertook a systematic review and meta-analysis of studies evaluating the predictive value of acute MRI lesion patterns for discriminating clinical outcome in traumatic brain injury...
December 2017: Critical Care Medicine
https://www.readbyqxmd.com/read/28981340/vestibular-consequences-of-mild-traumatic-brain-injury-and-blast-exposure-a-review
#15
Faith W Akin, Owen D Murnane, Courtney D Hall, Kristal M Riska
The purpose of this article is to review relevant literature on the effect of mild traumatic brain injury (mTBI) and blast injury on the vestibular system. Dizziness and imbalance are common sequelae associated with mTBI, and in some individuals, these symptoms may last for six months or longer. In war-related injuries, mTBI is often associated with blast exposure. The causes of dizziness or imbalance following mTBI and blast injuries have been linked to white matter abnormalities, diffuse axonal injury in the brain, and central and peripheral vestibular system damage...
2017: Brain Injury: [BI]
https://www.readbyqxmd.com/read/28966972/defining-an-analytic-framework-to-evaluate-quantitative-mri-markers-of-traumatic-axonal-injury-preliminary-results-in-a-mouse-closed-head-injury-model
#16
M Haber, E B Hutchinson, N Sadeghi, W H Cheng, D Namjoshi, P Cripton, M O Irfanoglu, C Wellington, R Diaz-Arrastia, C Pierpaoli
Diffuse axonal injury (DAI) is a hallmark of traumatic brain injury (TBI) pathology. Recently, the Closed Head Injury Model of Engineered Rotational Acceleration (CHIMERA) was developed to generate an experimental model of DAI in a mouse. The characterization of DAI using diffusion tensor magnetic resonance imaging (MRI; diffusion tensor imaging, DTI) may provide a useful set of outcome measures for preclinical and clinical studies. The objective of this study was to identify the complex neurobiological underpinnings of DTI features following DAI using a comprehensive and quantitative evaluation of DTI and histopathology in the CHIMERA mouse model...
September 2017: ENeuro
https://www.readbyqxmd.com/read/28963497/normobaric-hyperoxia-does-not-improve-derangements-in-diffusion-tensor-imaging-found-distant-from-visible-contusions-following-acute-traumatic-brain-injury
#17
Tonny V Veenith, Eleanor L Carter, Julia Grossac, Virginia F J Newcombe, Joanne G Outtrim, Sri Nallapareddy, Victoria Lupson, Marta M Correia, Marius M Mada, Guy B Williams, David K Menon, Jonathan P Coles
We have previously shown that normobaric hyperoxia may benefit peri-lesional brain and white matter following traumatic brain injury (TBI). This study examined the impact of brief exposure to hyperoxia using diffusion tensor imaging (DTI) to identify axonal injury distant from contusions. Fourteen patients with acute moderate/severe TBI underwent baseline DTI and following one hour of 80% oxygen. Thirty-two controls underwent DTI, with 6 undergoing imaging following graded exposure to oxygen. Visible lesions were excluded and data compared with controls...
September 29, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28962952/recovery-of-patients-with-pure-diffuse-axonal-injury-who-remained-in-a-coma-for-six-hours-or-more
#18
Rita de Cássia Almeida Vieira, Wellingson Silva Paiva, Daniel Vieira de Oliveira, Vinícius Monteiro de Paula Guirado, Ellen de Fátima Caetano Lança, Regina Márcia Cardoso de Sousa
BACKGROUND: Diffuse axonal injury (DAI) is a traumatic brain injury and one of the most common causes of unfavorable outcome and death. The aim of this study was to investigate the recovery of patients with pure DAI who remained in a coma for 6 hours or more after brain injury. METHODS: This was a follow-up study of 75 patients diagnosed with pure DAI, aged 18 to 60 years, with a Glasgow Coma Scale score ≤8 at hospital admission. Patient data were collected at hospital admission, hospital discharge, and 3 and 6 months after DAI...
September 26, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28956660/traumatic-axonal-injury-despite-clinical-phenotype-of-mild-traumatic-brain-injury-a-case-report
#19
Sung Ho Jang, Han Do Lee
OBJECTIVES: We report on a patient who suffered traumatic axonal injury (TAI) of various neural tracts despite airbag deployment following mild traumatic brain injury (TBI), which was demonstrated by diffusion tensor tractography (DTT). CASE DESCRIPTION: A 58-year-old female patient suffered from head trauma resulting from an in-car traffic accident. At the time of head trauma, her head and face hit the deployed airbag after flexion-hyperextension-rotation injury...
2017: Brain Injury: [BI]
https://www.readbyqxmd.com/read/28934247/the-extent-of-intrauterine-growth-restriction-determines-the-severity-of-cerebral-injury-and-neurobehavioural-deficits-in-rodents
#20
Crystal A Ruff, Stuart D Faulkner, Prakasham Rumajogee, Stephanie Beldick, Warren Foltz, Jennifer Corrigan, Alfred Basilious, Shangjun Jiang, Shanojan Thiyagalingam, Jerome Y Yager, Michael G Fehlings
BACKGROUND: Cerebral Palsy (CP) is the most common physical pediatric neurodevelopmental disorder and spastic diplegic injury is its most frequent subtype. CP results in substantial neuromotor and cognitive impairments that have significant socioeconomic impact. Despite this, its underlying pathophysiological mechanisms and etiology remain incompletely understood. Furthermore, there is a need for clinically relevant injury models, which a) reflect the heterogeneity of the condition and b) can be used to evaluate new translational therapies...
2017: PloS One
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