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https://www.readbyqxmd.com/read/28644203/invasive-investigation-of-insular-cortex-epilepsy
#1
Philippe Ryvlin, Fabienne Picard
Invasive long-term EEG investigations of the insula have been performed since the mid-nineties in an expanding range of focal epilepsies suspected to involve the insular cortex. The various clinical forms of insular epilepsies were delineated during the last 2 decades, and include the following presentations: perisylvian epilepsy, temporal plus epilepsy, sleep hypermotor epilepsy, MRI-negative frontal and parietal lobe epilepsies, and insular lesions. In fact, a majority of complex stereoelectroencephalography procedures will include at least one electrode targeting the insula...
July 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28643843/perisylvian-including-insular-childhood-epilepsy-presurgical-workup-and-surgical-outcome
#2
Elena Freri, Sara Matricardi, Francesca Gozzo, Massimo Cossu, Tiziana Granata, Laura Tassi
OBJECTIVE: To report the presurgical workup, surgical procedures, and outcomes in a series of pediatric patients with drug-resistant epilepsy involving the perisylvian/insular regions. METHODS: We retrospectively assessed 16 pediatric patients affected by drug-resistant focal epilepsy involving perisylvian/insular regions, who consecutively underwent tailored resective surgery. All patients underwent a detailed presurgical workup, which included the analysis of the anatomoelectroclinical correlations with scalp electroencephalography (EEG) and/or with stereo-electroencephalography (SEEG), brain magnetic resonance imaging (MRI), and comprehensive cognitive and neuropsychological evaluations...
June 23, 2017: Epilepsia
https://www.readbyqxmd.com/read/28630376/functional-connectivity-disturbances-of-the-ascending-reticular-activating-system-in-temporal-lobe-epilepsy
#3
Dario J Englot, Pierre-Francois D'Haese, Peter E Konrad, Monica L Jacobs, John C Gore, Bassel W Abou-Khalil, Victoria L Morgan
OBJECTIVE: Seizures in temporal lobe epilepsy (TLE) disturb brain networks and lead to connectivity disturbances. We previously hypothesised that recurrent seizures in TLE may lead to abnormal connections involving subcortical activating structures including the ascending reticular activating system (ARAS), contributing to neocortical dysfunction and neurocognitive impairments. However, no studies of ARAS connectivity have been previously reported in patients with epilepsy. METHODS: We used resting-state functional MRI recordings in 27 patients with TLE (67% right sided) and 27 matched controls to examine functional connectivity (partial correlation) between eight brainstem ARAS structures and 105 cortical/subcortical regions...
June 19, 2017: Journal of Neurology, Neurosurgery, and Psychiatry
https://www.readbyqxmd.com/read/28627088/astrogliosis-and-impaired-aquaporin-4-and-dystrophin-systems-in-idiopathic-normal-pressure-hydrocephalus
#4
Per Kristian Eide, Hans-Arne Hansson
AIMS: Idiopathic normal pressure hydrocephalus (iNPH) is one subtype of dementia that may improve following drainage of cerebrospinal fluid (CSF). This prospective observational study explored whether expression of the water channel aquaporin-4 (AQP4) and the anchoring molecule dystrophin 71 (Dp71) are altered at astrocytic perivascular endfeet and in adjacent neuropil of iNPH patient. Observations were related to measurements of pulsatile and static intracranial pressure (ICP). METHODS: The study included iNPH patients undergoing overnight monitoring of the pulsatile/static ICP, in whom a biopsy was taken from the frontal cerebral cortex during placement of the ICP sensor...
June 19, 2017: Neuropathology and Applied Neurobiology
https://www.readbyqxmd.com/read/28622530/brain-network-dynamics-in-the-human-articulatory-loop
#5
Masaaki Nishida, Anna Korzeniewska, Nathan E Crone, Goichiro Toyoda, Yasuo Nakai, Noa Ofen, Erik C Brown, Eishi Asano
OBJECTIVE: The articulatory loop is a fundamental component of language function, involved in the short-term buffer of auditory information followed by its vocal reproduction. We characterized the network dynamics of the human articulatory loop, using invasive recording and stimulation. METHODS: We measured high-gamma activity70-110 Hz recorded intracranially when patients with epilepsy either only listened to, or listened to and then reproduced two successive tones by humming...
May 17, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28622529/automatic-multimodal-detection-for-long-term-seizure-documentation-in-epilepsy
#6
F Fürbass, S Kampusch, E Kaniusas, J Koren, S Pirker, R Hopfengärtner, H Stefan, T Kluge, C Baumgartner
OBJECTIVE: This study investigated sensitivity and false detection rate of a multimodal automatic seizure detection algorithm and the applicability to reduced electrode montages for long-term seizure documentation in epilepsy patients. METHODS: An automatic seizure detection algorithm based on EEG, EMG, and ECG signals was developed. EEG/ECG recordings of 92 patients from two epilepsy monitoring units including 494 seizures were used to assess detection performance...
May 25, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28621621/indications-technique-and-safety-profile-of-insular-stereoelectroencephalography-electrode-implantation-in-medically-intractable-epilepsy
#7
Soha Alomar, Jeffrey P Mullin, Saksith Smithason, Jorge Gonzalez-Martinez
OBJECTIVE Insular epilepsy is relatively rare; however, exploring the insular cortex when preoperative workup raises the suspicion of insular epilepsy is of paramount importance for accurate localization of the epileptogenic zone and achievement of seizure freedom. The authors review their clinical experience with stereoelectroencephalography (SEEG) electrode implantation in patients with medically intractable epilepsy and suspected insular involvement. METHODS A total of 198 consecutive cases in which patients underwent SEEG implantation with a total of 1556 electrodes between June 2009 and April 2013 were reviewed...
June 16, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28591477/reduced-glucose-metabolism-in-neocortical-network-nodes-remote-from-hypothalamic-hamartomas-reflects-cognitive-impairment
#8
Kathrin Wagner, Andreas Schulze-Bonhage, Horst Urbach, Michael Trippel, Timo S Spehl, Franziska Buschmann, Birgitta Metternich, Isabell Ofer, Philipp T Meyer, Lars Frings
The clinical appearance of patients with hypothalamic hamartomas is very heterogeneous, and interindividual variability of intellectual abilities is not completely understood. We retrospectively investigated cerebral dysfunction as indicated by reduced regional glucose metabolism in 29 patients (age range 7-49 years) with epilepsy due to hypothalamic hamartomas. Brain metabolism assessed by [(18) F]FDG-PET was compared between patients with and without cognitive impairment controlled for unevenly distributed hamartoma lateralization seen on magnetic resonance imaging (MRI)...
June 2017: Epilepsia
https://www.readbyqxmd.com/read/28591055/stereoelectroencephalography-based-on-the-leksell-stereotactic-frame-and-neurotech-operation-planning-software
#9
Guangming Zhang, Guoqiang Chen, Dawei Meng, Yanwu Liu, Jianwei Chen, Lanmei Shu, Wenbo Liu
This study aimed to introduce a new stereoelectroencephalography (SEEG) system based on Leksell stereotactic frame (L-SEEG) as well as Neurotech operation planning software, and to investigate its safety, applicability, and reliability.L-SEEG, without the help of navigation, includes SEEG operation planning software (Neurotech), Leksell stereotactic frame, and corresponding surgical instruments. Neurotech operation planning software can be used to display three-dimensional images of the cortex and cortical vessels and to plan the intracranial electrode implantation...
June 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28588471/functional-network-connectivity-patterns-between-idiopathic-generalized-epilepsy-with-myoclonic-and-absence-seizures
#10
Qifu Li, Yongmin Chen, Yong Wei, Shengmei Chen, Lin Ma, Zhiyi He, Zhibin Chen
The extensive cerebral cortex and subcortical structures are considered as the major regions related to the generalized epileptiform discharges in idiopathic generalized epilepsy. However, various clinical syndromes and electroencephalogram (EEG) signs exist across generalized seizures, such as the loss of consciousness during absence seizures (AS) and the jerk of limbs during myoclonic seizures (MS). It is presumed that various functional systems affected by discharges lead to the difference in syndromes of these seizures...
2017: Frontiers in Computational Neuroscience
https://www.readbyqxmd.com/read/28578510/trans-falcine-and-contralateral-sub-frontal-electrode-placement-in-pediatric-epilepsy-surgery-technical-note
#11
Jonathan Pindrik, Nguyen Hoang, R Shane Tubbs, Brandon J Rocque, Curtis J Rozzelle
INTRODUCTION: Phase II monitoring with intracranial electroencephalography (ICEEG) occasionally requires bilateral placement of subdural (SD) strips, grids, and/or depth electrodes. While phase I monitoring often demonstrates a preponderance of unilateral findings, individual studies (video EEG, single photon emission computed tomography [SPECT], and positron emission tomography [PET]) can suggest or fail to exclude a contralateral epileptogenic onset zone. This study describes previously unreported techniques of trans-falcine and sub-frontal insertion of contralateral SD grids and depth electrodes for phase II monitoring in pediatric epilepsy surgery patients when concern about bilateral abnormalities has been elicited during phase I monitoring...
June 3, 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/28576731/quantify-neuromagnetic-network-changes-from-pre-ictal-to-ictal-activities-in-absence-seizures
#12
Caiyun Wu, Jing Xiang, Jintao Sun, Shuyang Huang, Lu Tang, Ailiang Miao, Yuchen Zhou, Qiqi Chen, Zheng Hu, Xiaoshan Wang
OBJECTIVE: The cortico-thalamo-cortical network plays a key role in childhood absence epilepsy (CAE). However, the exact interaction between the cortex and the thalamus remains incompletely understood. This study aimed to investigate the dynamic changes of frequency-dependent neural networks during the initialization of absence seizures. METHODS: Magnetoencephalography data from 14 patients with CAE were recorded during and between seizures at a sampling rate of 6000Hz and analyzed in seven frequency bands...
May 31, 2017: Neuroscience
https://www.readbyqxmd.com/read/28567171/a-functional-mri-based-model-for-individual-memory-assessment-in-patients-eligible-for-anterior-temporal-lobe-resection
#13
Maria Strandberg, Peter Mannfolk, Lars Stenberg, Hanna Ljung, Ia Rorsman, Elna-Marie Larsson, Danielle van Westen, Kristina Källén
TITLE: A functional (f) MRI-based model for individual memory assessment in patients eligible for temporal lobe resection. AIM: To investigate if pre-operative fMRI memory paradigms, add predictive information with regard to post-surgical memory deficits. METHODS: Fourteen pharmacoresistant Temporal Lobe Epilepsy (TLE) patients accepted for Anterior Temporal Lobe Resection (ATLR) were included. A clinical risk assessment score (RAS 0-3) was constructed from structural MRI, neuropsychological testing and hemisphere dominance...
2017: Open Neuroimaging Journal
https://www.readbyqxmd.com/read/28557904/characteristics-of-eeg-seizure-onset-patterns-recorded-from-subdural-electrodes-over-mri-visible-frontal-focal-cortical-dysplasia-type-iib-lesions
#14
Daisuke Hirozawa, Kiyohito Terada, Kazumi Matsuda, Keiko Usui, Naotaka Usui, Takayasu Tottori, Akihiko Kondo, Yasukiyo Araki, Yoshio Omote, Yumi Kashida, Hideki Mochizuki, Yushi Inoue
PURPOSE: Focal cortical dysplasia (FCD) is intrinsically epileptogenic, and an MRI-visible lesion typically constitutes the core part of the epileptogenic zone. We aimed to identify ictal EEG patterns that represent the epileptogenic zone by using subdural electrodes placed over the MRI-visible FCD lesion. METHODS: We selected seven patients with frontal lobe epilepsy caused by pathologically proven FCD type IIb who underwent preoperative intracranial EEG evaluation with subdural electrodes followed by resection surgery with seizure-free outcome...
May 25, 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28549335/microstructural-alterations-of-white-matter-in-juvenile-myoclonic-epilepsy
#15
Jinnan Gong, Xuebin Chang, Sisi Jiang, Benjamin Klugah-Brown, Song Tan, Dezhong Yao, Cheng Luo
Juvenile myoclonic epilepsy (JME) is a common type of idiopathic generalized epilepsy that is characterized by myoclonic jerks of the upper limbs and generalized tonic-clonic seizures. Frontal cognitive dysfunctions and abnormal coupling of the thalamocortical system have been found in neuropsychological and neuroimaging studies. This study intended to explore white matter (WM) measurement changes in JME using MRI. Twenty-six patients with JME and 25 healthy controls (HC) were recruited for the acquisition of diffusion MRI and structural MRI data...
April 4, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/28544889/juvenile-myoclonic-epilepsy-as-a-spectrum-disorder-a-focused-review
#16
REVIEW
Betül Baykan, Peter Wolf
In consequence of newer research juvenile myoclonic epilepsy (JME) is no longer seen as a homogeneous disease. The causes of the existing variance are only partially known yet. We discuss to what extent the phenotypical spectrum of this polygenetically determined disorder expresses genetically defined endophenotypes, or is due to mere quantitative differences in the expression of the core phenotype. Of the three common seizure types of JME, myoclonic, generalized tonic-clonic and absences, absences also occur independently and are strong candidates for an endophenotype...
July 2017: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/28542277/first-report-of-a-japanese-family-with-spinocerebellar-ataxia-type-10-the-second-report-from-asia-after-a-report-from-china
#17
Hiroyuki Naito, Tetsuya Takahashi, Masaki Kamada, Hiroyuki Morino, Hiroyo Yoshino, Nobutaka Hattori, Hirofumi Maruyama, Hideshi Kawakami, Masayasu Matsumoto
Spinocerebellar ataxia type 10 (SCA10) is an autosomal-dominant cerebellar ataxia that is variably accompanied by epilepsy and other neurological disorders. It is caused by an expansion of the ATTCT pentanucleotide repeat in intron 9 of the ATXN10 gene. Until now, SCA10 was almost exclusively found in the American continents, while no cases had been identified in Japan. Here, we report the first case of an SCA10 family from Japan. The clinical manifestations in our cases were cerebellar ataxia accompanied by epilepsy, hyperreflexia and cognitive impairment...
2017: PloS One
https://www.readbyqxmd.com/read/28535409/mesial-temporal-lobe-epilepsy-diminishes-functional-connectivity-during-emotion-perception
#18
Bettina K Steiger, Angela M Muller, Esther Spirig, Gianina Toller, Hennric Jokeit
OBJECTIVES: Unilateral mesial temporal lobe epilepsy (MTLE) has been associated with impaired recognition of emotional facial expressions. Correspondingly, imaging studies showed decreased activity of the amygdala and cortical face processing regions in response to emotional faces. However, functional connectivity among regions involved in emotion perception has not been studied so far. METHODS: To address this, we examined intrinsic functional connectivity (FC) modulated by the perception of dynamic fearful faces among the amygdala and limbic, frontal, temporal and brainstem regions...
May 10, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/28532712/photosensitivity-and-epilepsy-current-concepts-and-perspectives-a-narrative-review
#19
REVIEW
A Martins da Silva, Bárbara Leal
The authors review the influence of photic stimuli on the generation of epileptic seizures, addressing the first descriptions of the phenomenon and its subsequent exploration. Initially defined in the 1950's, links between intermittent photic stimulation (IPS) and seizures were well understood by the 1970. Since then the increasing exposure to photic stimuli associated with modern life (for instance through TVs, patterns, computer games and electronic instruments with flickering displays) has led to an increased interest in this issue...
April 5, 2017: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/28529877/the-dynamics-of-functional-connectivity-in-neocortical-focal-epilepsy
#20
Mangor Pedersen, Amir Omidvarnia, Evan K Curwood, Jennifer M Walz, Genevieve Rayner, Graeme D Jackson
Focal epilepsy is characterised by paroxysmal events, reflecting changes in underlying local brain networks. To capture brain network activity at the maximal temporal resolution of the acquired functional magnetic resonance imaging (fMRI) data, we have previously developed a novel analysis framework called Dynamic Regional Phase Synchrony (DRePS). DRePS measures instantaneous mean phase coherence within neighbourhoods of brain voxels. We use it here to examine how the dynamics of the functional connections of regional brain networks are altered in neocortical focal epilepsy...
2017: NeuroImage: Clinical
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