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Diffuse axonal injury

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https://www.readbyqxmd.com/read/28218643/diffusion-assessment-of-cortical-changes-induced-by-traumatic-spinal-cord-injury
#1
Peng Sun, Rory K J Murphy, Paul Gamble, Ajit George, Sheng-Kwei Song, Wilson Z Ray
Promising treatments are being developed to promote functional recovery after spinal cord injury (SCI). Magnetic resonance imaging, specifically Diffusion Tensor Imaging (DTI) has been shown to non-invasively measure both axonal and myelin integrity following traumatic brain and SCI. A novel data-driven model-selection algorithm known as Diffusion Basis Spectrum Imaging (DBSI) has been proposed to more accurately delineate white matter injury. The objective of this study was to investigate whether DTI/DBSI changes that extend to level of the cerebral peduncle and internal capsule following a SCI could be correlated with clinical function...
February 17, 2017: Brain Sciences
https://www.readbyqxmd.com/read/28214960/axonal-disruption-in-white-matter-underlying-cortical-sulcus-tau-pathology-in-chronic-traumatic-encephalopathy
#2
Laurena Holleran, Joong Hee Kim, Mihika Gangolli, Thor Stein, Victor Alvarez, Ann McKee, David L Brody
Chronic traumatic encephalopathy (CTE) is a progressive degenerative disorder associated with repetitive traumatic brain injury. One of the primary defining neuropathological lesions in CTE, based on the first consensus conference, is the accumulation of hyperphosphorylated tau in gray matter sulcal depths. Post-mortem CTE studies have also reported myelin loss, axonal injury and white matter degeneration. Currently, the diagnosis of CTE is restricted to post-mortem neuropathological analysis. We hypothesized that high spatial resolution advanced diffusion MRI might be useful for detecting white matter microstructural changes directly adjacent to gray matter tau pathology...
February 18, 2017: Acta Neuropathologica
https://www.readbyqxmd.com/read/28202707/cadasil-accelerated-by-acute-hypotension-arterial-and-venous-contribution-to-leukoaraiosis
#3
Jacqueline A Pettersen, Julia Keith, Fuqiang Gao, J David Spence, Sandra E Black
OBJECTIVE: To underline the importance of blood pressure regulation in cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) and to describe changes that occur in the veins in this condition, specifically venous collagenosis associated with leukoaraiosis. METHODS: Case report with neuroimaging and pathologic data. RESULTS: A 61-year-old man with genetically confirmed CADASIL was initially lucid following a motor vehicle accident but subsequently became hypotensive (60/40 mm Hg) due to an open femur fracture and required intubation...
February 15, 2017: Neurology
https://www.readbyqxmd.com/read/28190553/cervical-spine-imaging-for-young-children-with-inflicted-trauma-expanding-the-injury-pattern
#4
Joanne Baerg, Arul Thirumoorthi, Rosemary Vannix, Asma Taha, Amy Young, Alexander Zouros
AIM: The purpose of this study was to document the incidence and pattern of cervical spine (c-spine) injuries in children below 36months with inflicted trauma. METHODS: An IRB approved, prospective cohort study was performed between July 2011 and January 2016. Inclusion criteria were: age below 36months, loss of consciousness after inflicted trauma, and one initial head computed tomography finding: a subdural, intraventricular, intraparenchymal, subarachnoid hemorrhage, diffuse axonal injury, hypoxic injury, or cerebral edema...
January 30, 2017: Journal of Pediatric Surgery
https://www.readbyqxmd.com/read/28184360/evaluation-of-the-effect-of-glibenclamide-in-patients-with-diffuse-axonal-injury-due-to-moderate-to-severe-head-trauma
#5
Peyman Zafardoost, Amir Abbas Ghasemi, Firooz Salehpour, Chia Piroti, Ehsan Ziaeii
BACKGROUND: Traumatic brain injury (TBI) is a major health problem worldwide. Secondary injuries after TBI, including diffuse axonal injury (DAI) often occur, and proper treatments are needed in this regard. It has been shown that glibenclamide could reduce secondary brain damage after experimental TBI and improve outcomes. OBJECTIVES: We aim to evaluate the role of glibenclamide on the short-term outcome of patients with DAI due to moderate to severe TBI. PATIENTS AND METHODS: In this controlled randomized clinical trial, 40 patients with moderate to severe TBI were assigned to glibenclamide (n = 20) and control (n = 20) groups...
November 2016: Trauma Monthly
https://www.readbyqxmd.com/read/28173745/characterization-of-chronic-axonal-degeneration-using-diffusion-tensor-imaging-in-canine-spinal-cord-injury-a-quantitative-analysis-of-dti-parameters-according-to-histopathological-differences
#6
Hakyoung Yoon, Jaehwan Kim, Won-Jin Moon, Sang-Soep Nahm, Jun Zhao, Hyoung-Moon Kim, Kidong Eom
Diffusion tensor imaging (DTI) is more sensitive than conventional magnetic resonance imaging (MRI) for the identification of axonal degeneration. However, no study to date has used DTI to evaluate the severity of axonal degeneration in canine spinal cord injury. Therefore, the aim of this study was to characterize multi-grade axonal degeneration (mild, moderate, and severe) in a canine model of spinal cord compression injury using DTI. MRI data were obtained from six normal dogs and five dogs with lumbar spinal cord injury 78 days after spinal cord injury (L1-L3) using a 3T MRI scanner...
February 7, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28164149/single-low-dose-lipopolysaccharide-preconditioning-neuroprotective-against-axonal-injury-and-modulates-glial-cells
#7
Ryan C Turner, Zachary J Naser, Brandon P Lucke-Wold, Aric F Logsdon, Reyna L Vangilder, Rae R Matsumoto, Jason D Huber, Charles L Rosen
AIM: Over 7 million traumatic brain injuries (TBI) are reported each year in the United States. However, treatments and neuroprotection following TBI are limited because secondary injury cascades are poorly understood. Lipopolysaccharide (LPS) administration before controlled cortical impact can contribute to neuroprotection. However, the underlying mechanisms and whether LPS preconditioning confers neuroprotection against closed-head injuries remains unclear. METHODS: The authors hypothesized that preconditioning with a low dose of LPS (0...
January 2017: Neuroimmunology and Neuroinflammation
https://www.readbyqxmd.com/read/28128655/longitudinal-changes-in-diffusion-tensor-imaging-parameters-of-the-corpus-callosum-between-6-and-12-months-after-diffuse-axonal-injury
#8
Johan Ljungqvist, Daniel Nilsson, Maria Ljungberg, Eva Esbjörnsson, Catherine Eriksson-Ritzén, Thomas Skoglund
BACKGROUND: Magnetic resonance diffusion tensor imaging (MR-DTI) is used increasingly to detect diffuse axonal injury (DAI) after traumatic brain injury (TBI). PRIMARY OBJECTIVE: To investigate changes in the diffusion tensor imaging parameters of the corpus callosum 6 and 12 months after TBI, to optimize the timing of follow-up DTI investigations. A secondary goal was to study the relationship between DTI parameters and outcome. RESEARCH DESIGN: Longitudinal prospective study...
January 27, 2017: Brain Injury: [BI]
https://www.readbyqxmd.com/read/28126745/differences-in-callosal-and-forniceal-diffusion-between-patients-with-and-without-postconcussive-migraine
#9
L M Alhilali, J Delic, S Fakhran
BACKGROUND AND PURPOSE: Posttraumatic migraines are common after mild traumatic brain injury. The purpose of this study was to determine if a specific axonal injury pattern underlies posttraumatic migraines after mild traumatic brain injury utilizing Tract-Based Spatial Statistics analysis of diffusion tensor imaging. MATERIALS AND METHODS: DTI was performed in 58 patients with mild traumatic brain injury with posttraumatic migraines. Controls consisted of 17 patients with mild traumatic brain injury without posttraumatic migraines...
January 26, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28095027/severe-and-extensive-traumatic-axonal-injury-following-minor-and-indirect-head-trauma
#10
Sung Ho Jang, Han Do Lee
OBJECTIVES: This study reports on a patient with mild traumatic brain injury (TBI) who showed severe and extensive traumatic axonal injury (TAI) of various neural tracts following minor and indirect head trauma, which was demonstrated by diffusion tensor tractography (DTT). CASE DESCRIPTION: A 26-year-old female patient suffered from indirect head trauma resulting from flexion-hyperextension injury after being hit from behind by a slowly moving car. At the time of head trauma, she felt tingling sensation on her four extremities; however, she did not experience loss of consciousness...
January 17, 2017: Brain Injury: [BI]
https://www.readbyqxmd.com/read/28072502/wallerian-degeneration-beyond-the-corticospinal-tracts-conventional-and-advanced-mri-findings
#11
REVIEW
Yin Jie Chen, Seyed Ali Nabavizadeh, Arastoo Vossough, Sunil Kumar, Laurie A Loevner, Suyash Mohan
Wallerian degeneration (WD) is defined as progressive anterograde disintegration of axons and accompanying demyelination after an injury to the proximal axon or cell body. Since the 1980s and 1990s, conventional magnetic resonance imaging (MRI) sequences have been shown to be sensitive to changes of WD in the subacute to chronic phases. More recently, advanced MRI techniques, such as diffusion-weighted imaging (DWI) and diffusion tensor imaging (DTI), have demonstrated some of earliest changes attributed to acute WD, typically on the order of days...
November 7, 2016: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/28070672/opposing-effects-of-progranulin-deficiency-on-amyloid-and-tau-pathologies-via-microglial-tyrobp-network
#12
Hideyuki Takahashi, Zoe A Klein, Sarah M Bhagat, Adam C Kaufman, Mikhail A Kostylev, Tsuneya Ikezu, Stephen M Strittmatter
Progranulin (PGRN) is implicated in Alzheimer's disease (AD) as well as frontotemporal lobar degeneration. Genetic studies demonstrate an association of the common GRN rs5848 variant that results in reduced PGRN levels with increased risk for AD. However, the mechanisms by which PGRN reduction from the GRN AD risk variant or mutation exacerbates AD pathophysiology remain ill defined. Here, we show that the GRN AD risk variant has no significant effects on florbetapir positron emission tomographic amyloid imaging and cerebrospinal fluid (CSF) Aβ levels, whereas it is associated with increased CSF tau levels in human subjects of the Alzheimer's disease neuroimaging initiative studies...
January 9, 2017: Acta Neuropathologica
https://www.readbyqxmd.com/read/28059709/microstructure-of-the-default-mode-network-in-preterm-infants
#13
J Cui, O Tymofiyeva, R Desikan, T Flynn, H Kim, D Gano, C P Hess, D M Ferriero, A J Barkovich, D Xu
BACKGROUND AND PURPOSE: Diffusion and fMRI has been providing insights to brain development in addition to anatomic imaging. This study aimed to evaluate the microstructure of white matter tracts underlying the default mode network in premature infants by using resting-state functional MR imaging in conjunction with diffusion tensor imaging-based tractography. MATERIALS AND METHODS: A cohort of 44 preterm infants underwent structural T1-weighted imaging, resting-state fMRI, and DTI at 3T, including 21 infants with brain injuries and 23 infants with normal-appearing structural imaging as controls...
February 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28038987/adaptive-reorganization-of-retinogeniculate-axon-terminals-in-dorsal-lateral-geniculate-nucleus-following-experimental-mild-traumatic-brain-injury
#14
Vishal C Patel, Christopher W D Jurgens, Thomas E Krahe, John T Povlishock
The pathologic process in traumatic brain injury marked by delayed axonal loss, known as diffuse axonal injury (DAI), leads to partial deafferentation of neurons downstream of injured axons. This process is linked to persistent visual dysfunction following mild traumatic brain injury (mTBI), however, examination of deafferentation in humans is impossible with current technology. To investigate potential reorganization in the visual system following mTBI, we utilized the central fluid percussion injury (cFPI) mouse model of mTBI...
March 2017: Experimental Neurology
https://www.readbyqxmd.com/read/28007313/neuropsychological-alterations-and-neuroradiological-findings-in-patients-with-post-traumatic-concussion-results-of-a-pilot-study
#15
A Rădoi, M A Poca, V Cañas, J M Cevallos, L Membrado, M C Saavedra, M Vidal, F Martínez-Ricarte, J Sahuquillo
INTRODUCTION: Mild traumatic brain injury (mTBI) has traditionally been considered to cause no significant brain damage since symptoms spontaneously remit after a few days. However, this idea is facing increasing scrutiny. The purpose of this study is to demonstrate the presence of early cognitive alterations in a series of patients with mTBI and to link these findings to different markers of brain damage. METHODS: We conducted a prospective study of a consecutive series of patients with mTBI who were evaluated over a 12-month period...
December 19, 2016: Neurología: Publicación Oficial de la Sociedad Española de Neurología
https://www.readbyqxmd.com/read/28003570/correlations-between-cognitive-impairments-and-employment-status-in-patients-with-diffuse-axonal-injury
#16
Shin Hirota, Motoki Inaji, Tadashi Nariai, Mutsuya Hara, Masashi Tamaki, Taketoshi Maehara, Hiroki Tomita, Osamu Tone
Patients with diffuse axonal injury (DAI) may initially present with prominent physical impairments, but their cognitive dysfunctions are more persistent and are attributable to later unemployment. In this study, we analyzed how the findings of early and delayed neuropsychological assessments correlated with employment outcome of patients with DAI. A total of 56 patients with DAI without motor or visual dysfunction were included in this study. The neuropsychological battery consisted of the Wechsler Adult Intelligent Scale - Revised (WAIS-R), Wechsler Memory Scale - Revised (WMS-R), Trail Making Test (TMT), Wisconsin Card Sorting Test (WCST), and Word Fluency Test (WFT)...
December 22, 2016: Neurologia Medico-chirurgica
https://www.readbyqxmd.com/read/27997548/using-diffusion-tensor-imaging-to-evaluate-microstructural-changes-and-outcomes-after-radiofrequency-rhizotomy-of-trigeminal-nerves-in-patients-with-trigeminal-neuralgia
#17
Shu-Tian Chen, Jen-Tsung Yang, Mei-Yu Yeh, Hsu-Huei Weng, Chih-Feng Chen, Yuan-Hsiung Tsai
Trigeminal neuralgia is characterized by facial pain that may be sudden, intense, and recurrent. Our aim was to investigate microstructural tissue changes of the trigeminal nerve in patients with trigeminal neuralgia resulting from neurovascular compression by diffusion tensor imaging, and to test the predictive value of diffusion tensor imaging for determining outcomes after radiofrequency rhizotomy. Forty-three patients with trigeminal neuralgia were recruited, and diffusion tensor imaging was performed before radiofrequency rhizotomy...
2016: PloS One
https://www.readbyqxmd.com/read/27923561/neuropathology-and-neurobehavioral-alterations-in-a-rat-model-of-traumatic-brain-injury-to-occupants-of-vehicles-targeted-by-underbody-blasts
#18
Flaubert Tchantchou, William L Fourney, Ulrich H Leiste, Joshua Vaughan, Parisa Rangghran, Adam Puche, Gary Fiskum
Many victims of blast-induced traumatic brain injury are occupants of military vehicles targeted by land mines. Recently improved vehicle designs protect these individuals against blast overpressure, leaving acceleration as the main force potentially responsible for brain injury. We recently developed a unique rat model of under-vehicle blast-induced hyperacceleration where exposure to acceleration as low as 50G force results in histopathological evidence of diffuse axonal injury and astrocyte activation, with no evidence of neuronal cell death...
December 5, 2016: Experimental Neurology
https://www.readbyqxmd.com/read/27902865/small-world-properties-changes-in-mild-traumatic-brain-injury
#19
Yongxia Zhou
PURPOSE: To investigate local and global efficiency changes characterized by small-world properties based on resting-state functional MRI, such as centrality and clustering coefficient, in mild traumatic brain injury (MTBI) patients; and to associate these findings with axonal injury as measured by diffusion tensor imaging (DTI) as well as with post-concussive symptom (PCS). MATERIALS AND METHODS: Thirty patients (mean age 35 ± 13 years) with clinically defined MTBI and 45 age-matched healthy controls (mean age 37 ± 10 years) participated in the experiments...
November 30, 2016: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/27857925/a-viewpoint-on-treatment-of-traumatic-bilateral-basal-ganglia-hemorrhage-in-a-child-case-report
#20
Kyeong Hee Baek, Chul Hee Lee, Sung Kwon Kim, Hyun Park, Dong Ho Kang, Soo Hyun Hwang
Traumatic basal ganglia hemorrhage (TBGH) is a rare presentation of head injuries. Bilateral lesions are extremely rare. The pathophysiologic mechanism of bilateral TBGH seems to be the same as diffuse axonal injury. However, limited information about childhood bilateral TBGH is available in the literature. We report the case of a child with bilateral TBGH treated with stereotactic aspiration of hemorrhage and periodic urokinase irrigation.
October 2016: Korean Journal of Neurotrauma
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