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https://www.readbyqxmd.com/read/29149767/the-effects-of-sleep-on-the-neural-correlates-of-pattern-separation
#1
Christopher R Doxey, Cooper Hodges, Ty Bodily, Nathan M Muncy, C Brock Kirwan
Effective memory representations must be specific to prevent interference between episodes that may overlap in terms of place, time, or items present. Pattern separation, a computational process performed by the hippocampus, overcomes this interference by establishing non-overlapping memory representations. Although it is widely accepted that declarative memories are consolidated during sleep, the effects of sleep on pattern separation have yet to be elucidated. We used whole-brain, high-resolution functional neuroimaging to investigate the effects of sleep on a task that places high demands on pattern separation...
November 17, 2017: Hippocampus
https://www.readbyqxmd.com/read/29149760/patterns-of-relapse-in-poor-prognosis-germ-cell-tumours-in-the-getug-13-trial-implications-for-assessment-of-brain-metastases
#2
Y Loriot, L Pagliaro, A Fléchon, J Mardiak, L Geoffrois, P Kerbrat, C Chevreau, R Delva, F Rolland, C Theodore, G Roubaud, G Gravis, J C Eymard, J P Malhaire, C Linassier, M Habibian, A L Martin, F Journeau, M Reckova, C Logothetis, A Laplanche, G Le Teuff, S Culine, K Fizazi
BACKGROUND: The GETUG 13 phase III trial tested personalised chemotherapy based on tumour marker decline in patients with poor-prognosis germ-cell tumour (GCT) and demonstrated that a dose-dense regimen improves progression-free survival in patients with an unfavourable decline. We investigated the pattern of relapse for patients included in GETUG 13. METHODS: We conducted an analysis of relapse events in patients from GETUG 13. Baseline procedures before inclusion in the trial comprised a thoraco-abdomino-pelvic computed tomography scan and a magnetic resonance imaging of the brain...
November 14, 2017: European Journal of Cancer
https://www.readbyqxmd.com/read/29149715/robust-brain-roi-segmentation-by-deformation-regression-and-deformable-shape-model
#3
Zhengwang Wu, Yanrong Guo, Sang Hyun Park, Yaozong Gao, Pei Dong, Seong-Whan Lee, Dinggang Shen
We propose a robust and efficient learning-based deformable model for segmenting regions of interest (ROIs) from structural MR brain images. Different from the conventional deformable-model-based methods that deform a shape model locally around the initialization location, we learn an image-based regressor to guide the deformable model to fit for the target ROI. Specifically, given any voxel in a new image, the image-based regressor can predict the displacement vector from this voxel towards the boundary of target ROI, which can be used to guide the deformable segmentation...
November 10, 2017: Medical Image Analysis
https://www.readbyqxmd.com/read/29149669/effective-clinical-classification-of-chronic-epilepsy-into-focal-and-generalized-a-cross-sectional-study
#4
Shambhu Kumar, Mamta Bhushan Singh, Garima Shukla, Sreenivas Vishnubhatla, M V Padma Srivastava, Vinay Goyal, Kameshwar Prasad, Victor Patterson
PURPOSE: Investigations such as EEG and brain imaging are often difficult to obtain in primary care settings of resource-limited regions impacting millions of epilepsy patients. We wanted to test the hypothesis that classification of chronic epilepsy into focal and generalized based on clinical history and examination alone would be comparable to making such a classification with additional inputs from EEG and brain imaging. METHODS: Two investigators independently classified consecutive chronic epilepsy patients into focal, generalized and unclassified epilepsy...
November 9, 2017: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/29149632/brain-structural-differences-between-73-and-92-year-olds-matched-for-childhood-intelligence-social-background-and-intracranial-volume
#5
Stuart J Ritchie, David Alexander Dickie, Simon R Cox, Maria Del C Valdés Hernández, Ruth Sibbett, Alison Pattie, Devasuda Anblagan, Paul Redmond, Natalie A Royle, Janie Corley, Susana Muñoz Maniega, Adele M Taylor, Sherif Karama, Tom Booth, Alan J Gow, John M Starr, Mark E Bastin, Joanna M Wardlaw, Ian J Deary
Fully characterizing age differences in the brain is a key task for combating aging-related cognitive decline. Using propensity score matching on 2 independent, narrow-age cohorts, we used data on childhood cognitive ability, socioeconomic background, and intracranial volume to match participants at mean age of 92 years (n = 42) to very similar participants at mean age of 73 years (n = 126). Examining a variety of global and regional structural neuroimaging variables, there were large differences in gray and white matter volumes, cortical surface area, cortical thickness, and white matter hyperintensity volume and spatial extent...
October 16, 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/29149617/decoding-early-and-late-cortical-contributions-to-individuation-of-attended-and-unattended-objects
#6
Claire K Naughtin, Jason B Mattingley, Angela D Bender, Paul E Dux
To isolate a visual stimulus as a unique object with a specific spatial location and time of occurrence, it is necessary to first register (individuate) the stimulus as a distinct perceptual entity. Recent investigations into the neural substrates of object individuation have suggested it is subserved by a distributed neural network, but previous manipulations of individuation load have introduced extraneous visual confounds, which might have yielded ambiguous findings, particularly in early cortical areas...
November 8, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29149481/neuroprotective-effects-of-melatonin-on-amphetamine-induced-dopaminergic-fiber-degeneration-in-the-hippocampus-of-postnatal-rats
#7
Tanawan Leeboonngam, Ratchadaporn Pramong, Kwankanit Sae-Ung, Piyarat Govitrapong, Pansiri Phansuwan-Pujito
Chronic amphetamine (AMPH) abuse leads to damage of the hippocampus, the brain area associated with learning and memory process. Previous results have shown that AMPH-induced dopamine neurotransmitter release, reactive oxygen species formation and degenerative protein aggregation lead to neuronal death. Melatonin, a powerful antioxidant, plays a role as a neuroprotective agent. The objective of this study was to investigate whether the protective effect of melatonin on AMPH-induced hippocampal damage in the postnatal rat acts through the dopaminergic pathway...
November 17, 2017: Journal of Pineal Research
https://www.readbyqxmd.com/read/29149410/tctp-in-neuronal-circuitry-assembly
#8
Cláudio Gouveia Roque, Christine E Holt
Although tctp expression in many areas of the human brain was reported more than 15 years ago, little was known about how it functions in neurons. The early notion that Tctp is primarily expressed in mitotic cells, together with reports suggesting a relative low abundance in the brain, has perhaps potentiated this almost complete disregard for the study of Tctp in the context of neuron biology. However, recent evidence has challenged this view, as a number of independent genome-wide profiling studies identified tctp mRNA among the most enriched in the axonal compartment across diverse neuronal populations, including embryonic retinal ganglion cells...
2017: Results and Problems in Cell Differentiation
https://www.readbyqxmd.com/read/29149396/a-survey-on-pediatric-brain-death-and-on-organ-transplantation-how-did-the-law-amendment-change-the-awareness-of-pediatric-healthcare-providers
#9
Takashi Araki, Hiroyuki Yokota, Koutaro Ichikawa
OBJECTIVES: In Japanese society taking a cautious attitude towards organ transplantation, we investigate how amendment of the Organ Transplant Law which legalized brain death (BD) determination criteria changed the awareness concerning BD and organ transplantation of pediatric healthcare providers. METHODS: The questionnaire survey adopted the bearer method and was sent to members of the Japanese Society of Emergency Pediatrics (JSEP). In both the surveys of 2008 and 2016, the same item "Questionnaire survey on BD and organ transplant" was disseminated...
October 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/29149394/challenges-and-opportunities-for-pediatric-severe-tbi-review-of-the-evidence-and-exploring-a-way-forward
#10
Michael J Bell, P David Adelson, Stephen R Wisniewski
Traumatic brain injury (TBI) is a leading killer of children in the developed and developing world. Despite evidence-based guidelines and several recent clinical trials, the progress in developing best practices for children with severe TBI has been slow. This article describes (i) the burden of the disease, (ii) the inadequacies of the evidence-based guidelines, (iii) the failure of the largest clinical trials to prove their primary hypotheses, and (iv) possible advances from an observational cohort study called the Approaches and Decisions for Acute Pediatric TBI (ADAPT) Trial that has recently completed enrollment...
October 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/29149393/challenges-in-minor-tbi-and-indications-for-head-ct-in-pediatric-tbi-an-update
#11
Navneet Singh, Ash Singhal
INTRODUCTION: Pediatric head trauma is one of the commonest presentations to emergency departments. Over 90% of such head injuries are considered mild, but still present risk acute clinical deterioration and longer term morbidity. Identifying which children are at risk of clinically important brain injuries remains challenging and much of the data on minor head injuries is based on the adult population. CHALLENGES IN PEDIATRICS: Children, however, are different, both anatomically and in terms of mechanism of injury, to adults and, even within the pediatric group, there are differences with age and stage of development...
October 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/29149391/decompressive-craniectomy-for-traumatic-intracranial-hypertension-application-in-children
#12
Adam M H Young, Angelos G Kolias, Peter J Hutchinson
Traumatic brain injury remains prevalent in children, particularly within the adolescent age group. In severe injury, the priority of treatment is to stabilise the patient initially and prevent the evolution of brain swelling and secondary ischaemia using tiers of medical therapy. The final stage of intervention for such patients is a decompressive craniectomy. Here in, we identify the current evidence for performing decompressive crainectomy in children including the results from the RESCUEicp study.
October 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/29149390/decompressive-craniectomy-and-csf-disorders-in-children
#13
Marie Manfiotto, Carmine Mottolese, Alexandru Szathmari, Pierre-Aurelien Beuriat, Olivier Klein, Matthieu Vinchon, Edouard Gimbert, Thomas Roujeau, Didier Scavarda, Michel Zerah, Federico Di Rocco
INTRODUCTION: Decompressive craniectomy (DC) is a lifesaving procedure but is associated to several post-operative complications, namely cerebrospinal fluid (CSF) dynamics impairment. The aim of this multicentric study was to evaluate the incidence of such CSF alterations after DC and review their impact on the overall outcome. MATERIAL AND METHODS: We performed a retrospective multicentric study to analyze the CSF disorders occurring in children aged from 0 to 17 years who had undergone a DC for traumatic brain injury (TBI) in the major Departments of Pediatric Neurosurgery of France between January 2006 and August 2016...
October 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/29149389/autoregulation-in-paediatric-tbi-current-evidence-and-implications-for-treatment
#14
REVIEW
Joseph E Donnelly, Adam M H Young, Ken Brady
BACKGROUND: Children who survive acute traumatic brain injury are at risk of death from subsequent brain swelling and secondary injury. Strict physiologic management in the ICU after traumatic brain injury is believed to be key to survival, and cerebral perfusion pressure is a prominent aspect of post brain injury care. However, optimal cerebral perfusion pressure targets for children are not known. Autoregulation monitoring has been used to delineate individualized optimal perfusion pressures for patients with traumatic brain injury...
October 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/29149388/problems-of-reconstructive-cranioplasty-after-traumatic-brain-injury-in-children
#15
Paolo Frassanito, Gianpiero Tamburrini, Luca Massimi, Simone Peraio, Massimo Caldarelli, Concezio Di Rocco
Cranial repair after traumatic brain injury in children is still burdened by unsolved problems and controversial issues, mainly due to the high rate of resorption of autologous bone as well as the absence of valid alternative material to replace the autologous bone. Indeed, inert biomaterials are associated to satisfactory results in the short period but bear the continuous risk of complications related to the lack of osteointegration capacity. Biomimetic materials claiming osteoconductive properties that could balance their mechanical limits seem to allow good cranial bone reconstruction...
October 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/29149387/analgosedation-in-paediatric-severe-traumatic-brain-injury-tbi-practice-pitfalls-and-possibilities
#16
N Ketharanathan, Y Yamamoto, U Rohlwink, E D Wildschut, M Hunfeld, E C M de Lange, D Tibboel
Analgosedation is a fundamental part of traumatic brain injury (TBI) treatment guidelines, encompassing both first and second tier supportive strategies. Worldwide analgosedation practices continue to be heterogeneous due to the low level of evidence in treatment guidelines (level III) and the choice of analgosedative drugs is made by the treating clinician. Current practice is thus empirical and may result in unfavourable (often hemodynamic) side effects. This article presents an overview of current analgosedation practices in the paediatric intensive care unit (PICU) and addresses pitfalls both in the short and long term...
October 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/29149386/glucose-metabolism-in-pediatric-traumatic-brain-injury
#17
Mayumi L Prins
Traumatic brain injury is the number one cause of death and disability among the pediatric population in the USA. The heterogeneity of the pediatric population is reflected by both the normal cerebral maturation and the age differences in the causes of TBI, which generate unique age-related pathophysiology responses and recovery profiles. This review will address the normal changes in cerebral glucose metabolism throughout developmental phases and how TBI alters glucose metabolism. Evidence has shown that TBI disrupts the biochemical processing of glucose to energy...
October 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/29149385/pre-clinical-models-in-pediatric-traumatic-brain-injury-challenges-and-lessons-learned
#18
REVIEW
Patrick M Kochanek, Jessica S Wallisch, Hülya Bayır, Robert S B Clark
PURPOSE: Despite the enormity of the problem and the lack of new therapies, research in the pre-clinical arena specifically using pediatric traumatic brain injury (TBI) models is limited. In this review, some of the key models addressing both the age spectrum of pediatric TBI and its unique injury mechanisms will be highlighted. Four topics will be addressed, namely, (1) unique facets of the developing brain important to TBI model development, (2) a description of some of the most commonly used pre-clinical models of severe pediatric TBI including work in both rodents and large animals, (3) a description of the pediatric models of mild TBI and repetitive mild TBI that are relatively new, and finally (4) a discussion of challenges, gaps, and potential future directions to further advance work in pediatric TBI models...
October 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/29149384/brain-metabolism-and-severe-pediatric-traumatic-brain-injury
#19
Heidi Griffiths, Manu S Goyal, Jose A Pineda
Age-dependent changes in brain metabolism may influence the response to and tolerance of secondary insults, potentially affecting outcomes. More complete characterization of brain metabolism across the clinical trajectory of severe pediatric TBI is needed to improve our ability to measure and better mitigate the impact of secondary insults. Better management of secondary insults will impact clinical care and the probability of success of future neuroprotective clinical trials. Improved bedside monitoring and imaging technologies will be required to achieve these goals...
October 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/29149383/diffusion-mri-in-pediatric-brain-injury
#20
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
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