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Epilepsy cognition

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https://www.readbyqxmd.com/read/28346953/lennox-gastaut-syndrome-a-state-of-the-art-review
#1
Mario Mastrangelo
Lennox-Gastaut syndrome (LGS) is a severe age-dependent epileptic encephalopathy usually with onset between 1 and 8 years of age. Functional neuroimaging studies recently introduced the concept of Lennox-Gastaut as "secondary network epilepsy" resulting from dysfunctions of a complex system involving both cortical and subcortical structures (default-mode network, corticoreticular connections, and thalamus). These dysfunctions are produced by different disorders including hypoxic-ischemic encephalopathies, meningoencephalitis, cortical malformations, neurocutaneous disorders, or tumors...
March 27, 2017: Neuropediatrics
https://www.readbyqxmd.com/read/28346588/association-between-childhood-onset-epilepsy-and-amyloid-burden-5-decades-later
#2
Juho Joutsa, Juha O Rinne, Bruce Hermann, Mira Karrasch, Anu Anttinen, Shlomo Shinnar, Matti Sillanpää
Importance: The effect of childhood epilepsy on later-life cognitive and brain health is an unclear and little-explored issue. Objective: To determine whether adults with a history of childhood-onset epilepsy exhibit increased brain amyloid accumulation, possibly predisposing to accelerated cognitive impairment or even frank cognitive disorders in later life. Design, Setting, and Participants: Forty-one adults from a population-based cohort of individuals with childhood-onset epilepsy in southwestern Finland, together with 46 matched population-based controls, underwent amyloid ligand carbon 11-labeled Pittsburgh Compound B (PiB) positron emission tomography after long-term prospective follow-up...
March 27, 2017: JAMA Neurology
https://www.readbyqxmd.com/read/28343465/academic-outcomes-in-individuals-with-childhood-onset-epilepsy-mediating-effects-of-working-memory
#3
Ashley N Danguecan, Mary Lou Smith
OBJECTIVES: Academic difficulties are common in children with epilepsy, although little is known about the effect of various seizure-related and cognitive variables. Given that persistent seizures may negatively impact academics, and that working memory is predictive of academic abilities, we examined the effects of recent seizures and working memory on word reading, spelling, and arithmetic in pediatric epilepsy. We hypothesized that persistent seizures would be associated with lower working memory ability, which would in turn result in poorer academic performance...
March 27, 2017: Journal of the International Neuropsychological Society: JINS
https://www.readbyqxmd.com/read/28335018/dissecting-gamma-frequency-activity-during-human-memory-processing
#4
Michal T Kucewicz, Brent M Berry, Vaclav Kremen, Benjamin H Brinkmann, Michael R Sperling, Barbara C Jobst, Robert E Gross, Bradley Lega, Sameer A Sheth, Joel M Stein, Sandthitsu R Das, Richard Gorniak, S Matthew Stead, Daniel S Rizzuto, Michael J Kahana, Gregory A Worrell
Gamma frequency activity (30-150 Hz) is induced in cognitive tasks and is thought to reflect underlying neural processes. Gamma frequency activity can be recorded directly from the human brain using intracranial electrodes implanted in patients undergoing treatment for drug-resistant epilepsy. Previous studies have independently explored narrowband oscillations in the local field potential and broadband power increases. It is not clear, however, which processes contribute to human brain gamma frequency activity, or their dynamics and roles during memory processing...
March 13, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28335000/better-than-sham-a-double-blind-placebo-controlled-neurofeedback-study-in-primary-insomnia
#5
Manuel Schabus, Hermann Griessenberger, Maria-Teresa Gnjezda, Dominik P J Heib, Malgorzata Wislowska, Kerstin Hoedlmoser
Neurofeedback training builds upon the simple concept of instrumental conditioning, i.e. behaviour that is rewarded is more likely to reoccur, an effect Thorndike referred to as the 'law of effect'. In the case of neurofeedback, information about specific electroencephalographic activity is fed back to the participant who is rewarded whenever the desired electroencephalography pattern is generated. If some kind of hyperarousal needs to be addressed, the neurofeedback community considers sensorimotor rhythm neurofeedback as the gold standard...
February 23, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28334947/protocadherin-19-pcdh19-interacts-with-paraspeckle-protein-nono-to-co-regulate-gene-expression-with-estrogen-receptor-alpha-er%C3%AE
#6
Duyen H Pham, Chuan Tan, Claire C Homan, Kristy Kolc, Mark Corbett, Dale McAninch, Archa Fox, Paul Thomas, Raman Kumar, Jozef Gecz
De novo and inherited mutations of X-chromosome cell adhesion molecule protocadherin 19 (PCDH19) cause frequent, highly variable epilepsy, autism, cognitive decline and behavioural problems syndrome. Intriguingly, hemizygous null males are not affected while heterozygous females are, contradicting established X-chromosome inheritance. The disease mechanism is not known. Cellular mosaicism is the likely driver. We have identified p54nrb/NONO, a multifunctional nuclear paraspeckle protein with known roles in nuclear hormone receptor gene regulation, as a PCDH19 protein interacting partner...
March 17, 2017: Human Molecular Genetics
https://www.readbyqxmd.com/read/28334879/altered-sleep-homeostasis-correlates-with-cognitive-impairment-in-patients-with-focal-epilepsy
#7
Melanie Boly, Benjamin Jones, Graham Findlay, Erin Plumley, Armand Mensen, Bruce Hermann, Guilio Tononi, Rama Maganti
In animal studies, both seizures and interictal spikes induce synaptic potentiation. Recent evidence suggests that electroencephalogram slow wave activity during sleep reflects synaptic potentiation during wake, and that its homeostatic decrease during the night is associated with synaptic renormalization and its beneficial effects. Here we asked whether epileptic activity induces plastic changes that can be revealed by high-density electroencephalography recordings during sleep in 15 patients with focal epilepsy and 15 control subjects...
March 14, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28334078/relationships-between-morphologic-and-functional-patterns-in-the-polymicrogyric-cortex
#8
Matteo Lenge, Carmen Barba, Domenico Montanaro, Gayane Aghakhanyan, Francesca Frijia, Renzo Guerrini
Polymicrogyria is a malformation of cortical folding and layering underlying different cognitive and neurological manifestations. The polymicrogyric cortex has heterogeneous morphofunctional patterns, qualitatively described at magnetic resonance imaging (MRI) by variable severity gradients and functional activations. We investigated the link between abnormal cortical folding and cortical function in order to improve surgical planning for patients with polymicrogyria and intractable epilepsy. We performed structural and functional MRI on 14 patients with perisylvian polymicrogyria and adopted surface-based methods to detect alterations of cortical thickness (CT) and local gyrification index (LGI) compared with normal cortex (30 age-matched subjects)...
February 18, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28325891/whole-exome-sequencing-identifies-a-novel-de-novo-mutation-in-dync1h1-in-epileptic-encephalopathies
#9
Zhongdong Lin, Zhenwei Liu, Xiucui Li, Feng Li, Ying Hu, Bingyu Chen, Zhen Wang, Yong Liu
Epileptic encephalopathies (EE) are a group of severe childhood epilepsy disorders characterized by intractable seizures, cognitive impairment and neurological deficits. Recent whole-exome sequencing (WES) studies have implicated significant contribution of de novo mutations to EE. In this study, we utilized WES for identifying causal de novo mutations in 4 parent-offspring trios affected by West syndrome. As a result, we found two deleterious de novo mutations in DYNC1H1 and RTP1 in two trios. Expression profile analysis showed that DYNC1H1 and RTP1 are expressed in almost all brain regions and developmental stages...
March 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28324301/neuroimaging-in-epilepsy
#10
REVIEW
Erik H Middlebrooks, Lawrence Ver Hoef, Jerzy P Szaflarski
In recent years, the field of neuroimaging has undergone dramatic development. Specifically, of importance for clinicians and researchers managing patients with epilepsies, new methods of brain imaging in search of the seizure-producing abnormalities have been implemented, and older methods have undergone additional refinement. Methodology to predict seizure freedom and cognitive outcome has also rapidly progressed. In general, the image data processing methods are very different and more complicated than even a decade ago...
April 2017: Current Neurology and Neuroscience Reports
https://www.readbyqxmd.com/read/28320269/status-epilepticus-impairs-synaptic-plasticity-in-rat-hippocampus-and-is-followed-by-changes-in-expression-of-nmda-receptors
#11
T Y Postnikova, O E Zubareva, A A Kovalenko, K K Kim, L G Magazanik, A V Zaitsev
Cognitive deficits and memory loss are frequent in patients with temporal lobe epilepsy. Persistent changes in synaptic efficacy are considered as a cellular substrate underlying memory processes. Electrophysiological studies have shown that the properties of short-term and long-term synaptic plasticity in the cortex and hippocampus may undergo substantial changes after seizures. However, the neural mechanisms responsible for these changes are not clear. In this study, we investigated the properties of short-term and long-term synaptic plasticity in rat hippocampal slices 24 h after pentylenetetrazole (PTZ)-induced status epilepticus...
March 2017: Biochemistry. Biokhimii︠a︡
https://www.readbyqxmd.com/read/28318972/persistent-single-neuron-activity-during-working-memory-in-the-human-medial-temporal-lobe
#12
Simon Kornblith, Rodrigo Quian Quiroga, Christof Koch, Itzhak Fried, Florian Mormann
Working memory is an essential component of human cognition. Persistent activity related to working memory has been reported in many brain areas, including the inferior temporal and prefrontal cortex [1-8]. The medial temporal lobe (MTL) contains "concept cells" that respond invariantly to specific individuals or places whether presented as images, text, or speech [9, 10]. It is unknown, however, whether the MTL also participates in working memory processes. We thus sought to determine whether human MTL neurons respond to images held in working memory...
March 15, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28316319/epileptic-spasms-in-paediatric-post-traumatic-epilepsy-at-a-tertiary-referral-centre
#13
Jun T Park, Harry T Chugani
To recognize epileptic spasms (ES) as a seizure type after traumatic brain injury (TBI), accidental or non-accidental, in infants and children. In the process, we aim to gain some insight into the mechanisms of epileptogenesis in ES. A retrospective electronic chart review was performed at the Children's Hospital of Michigan from 2002 to 2012. Electronic charts of 321 patients were reviewed for evidence of post-traumatic epilepsy. Various clinical variables were collected including age at TBI, mechanism of trauma, severity of brain injury, electroencephalography/neuroimaging data, and seizure semiology...
March 17, 2017: Epileptic Disorders: International Epilepsy Journal with Videotape
https://www.readbyqxmd.com/read/28302757/alteration-of-monoamine-receptor-activity-and-glucose-metabolism-in-paediatric-patients-with-anticonvulsant-induced-cognitive-impairment
#14
Yuankai Zhu, Jianhua Feng, Jianfeng Ji, Haifeng Hou, Lin Chen, Shuang Wu, Qing Liu, Qiong Yao, Peizhen Du, Kai Zhang, Qing Chen, Zexin Chen, Hong Zhang, Mei Tian
A landmark study from the Institute of Medicine (IOM) reported that the assessment of cognitive difficulties in children with epilepsy is timely and imperative. Anticonvulsant-induced cognitive impairment could influence the quality of life more than seizure itself in patients. Although monoaminergic system is involved in the regulation of cognitive process, its role in anticonvulsant-induced cognitive impairment remains unclear. Methods: To explore in vivo monoamine receptor binding activity in patients with anticonvulsant-induced cognitive impairment, each patient had PET imaging with both monoamine receptor binding agent, (11)C-N-methylspiperone ((11)C-NMSP), and glucose metabolic agent, (18)F-fluorodeoxyglucose ((18)F-FDG)...
March 16, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28298884/physical-exercise-restores-the-generation-of-newborn-neurons-in-an-animal-model-of-chronic-epilepsy
#15
Fabricio N Mendonça, Luiz E C Santos, Antônio M Rodrigues, Sérgio Gomes da Silva, Ricardo M Arida, Gilcélio A da Silveira, Fulvio A Scorza, Antônio-Carlos G Almeida
Neurogenesis impairment is associated with the chronic phase of the epilepsy in humans and also observed in animal models. Recent studies with animal models have shown that physical exercise is capable of improving neurogenesis in adult subjects, alleviating cognitive impairment and depression. Here, we show that there is a reduction in the generation of newborn granule cells in the dentate gyrus of adult rats subjected to a chronic model of epilepsy during the postnatal period of brain development. We also show that the physical exercise was capable to restore the number of newborn granule cells in this animals to the level observed in the control group...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28298846/menkes-disease-and-response-to-copper-histidine-an-indian-case-series
#16
Sangeetha Yoganathan, Sniya Valsa Sudhakar, Gautham Arunachal, Maya Thomas, Annadurai Subramanian, Renu George, Sumita Danda
BACKGROUND: Menkes disease (MD) is an X-linked recessive neurodegenerative disorder caused by mutations in ATP7A gene. Depending on the residual ATP7A activity, manifestation may be classical MD, occipital horn syndrome, or distal motor neuropathy. Neurological sparing is expected in female carriers. However, on rare occasions, females may manifest with classical clinical phenotype due to skewed X-chromosome inactivation, X-autosome translocation, and XO genotype. Here, we describe a small series of probands with MD and their response to copper histidine therapy...
January 2017: Annals of Indian Academy of Neurology
https://www.readbyqxmd.com/read/28295155/antecedents-and-neuroimaging-patterns-in-cerebral-palsy-with-epilepsy-and-cognitive-impairment-a-population-based-study-in-children-born-at-term
#17
Kristina Ahlin, Bo Jacobsson, Staffan Nilsson, Kate Himmelmann
INTRODUCTION: Antecedents of accompanying impairments in cerebral palsy (CP) and their relation to neuroimaging patterns need to be explored. MATERIAL AND METHODS: A population-based study of 309 children with CP born at term in 1983-1994. Pre-, intra- and postpartum variables previously studied as antecedents of CP type and motor severity were analysed in children with CP and cognitive impairment and/or epilepsy, and in children with CP without these accompanying impairments...
March 12, 2017: Acta Obstetricia et Gynecologica Scandinavica
https://www.readbyqxmd.com/read/28293314/clinical-spectrum-of-cerebral-palsy-and-associated-disability-in-south-egypt-a-local-survey-study
#18
Osama Abas, Faten Abdelaziem, Ayman Kilany
BACKGROUND: Cerebral palsy is the most common cause of motor disability in children with a prevalence of 2-10/1,000 live births in the developing areas. AIM: The epidemiology, clinical picture, and associated comorbidities in CP have been extensively studied in high-resource countries, but in low-resource areas, including Africa, those studies are still lacking. METHODS: Cerebral palsy cases were prospectively recruited from every physiotherapy centre in Bani-Mazar city, Egypt, in a cross-sectional study from May 2015 to November 2015...
March 15, 2017: Open Access Macedonian Journal of Medical Sciences
https://www.readbyqxmd.com/read/28287071/auditory-seizures-in-autoimmune-epilepsy-a-case-with-anti-thyroid-antibodies
#19
Claudia Varrasi, Domizia Vecchio, Luca Magistrelli, Gionata Strigaro, Laura Tassi, Roberto Cantello
In its classic presentation, Hashimoto's encephalopathy is an acute-subacute complex neuropsychiatric syndrome with cognitive impairment, hallucinations, myoclonus, tremor or ataxia, associated with elevated anti-thyroid antibodies. Corticoids and immunotherapy are dramatically effective. However, in some cases, not all the associated features are presented and this delays diagnosis and appropriate treatment. We describe a man with abrupt onset of recurrent auditory seizures resulting in refractory non-convulsive status epilepticus...
March 8, 2017: Epileptic Disorders: International Epilepsy Journal with Videotape
https://www.readbyqxmd.com/read/28284559/epilepsy-and-cognition-a-bidirectional-relationship
#20
REVIEW
Christoph Helmstaedter, Juri-Alexander Witt
Cognitive comorbidities are very common in epilepsy and often seen as secondary to epilepsy or caused by epilepsy. The implicit and sometimes explicit assumption is that epilepsy (i.e. having seizures) damages the brain and thus leads to functional deterioration and behavioral alterations. This article highlights the historical background surrounding this viewpoint which is characterized by old reports on 'epileptic dementia' and the fact that most cognitive research in chronic epilepsies is done retrospectively...
March 1, 2017: Seizure: the Journal of the British Epilepsy Association
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