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FMRI and epilepsy

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https://www.readbyqxmd.com/read/29327337/generalized-nonmotor-absence-seizures-what-do-absence-generalized-and-nonmotor-mean
#1
REVIEW
Iris Unterberger, Eugen Trinka, Peter W Kaplan, Gerald Walser, Gerhard Luef, Gerhard Bauer
OBJECTIVE: Clinical absences are now classified as "generalized nonmotor (absence) seizures" by the International League Against Epilepsy (ILAE). The aim of this paper is to critically review the concept of absences and to put the accompanying focal and motor symptoms into the context of the emerging pathophysiological knowledge. METHODS: For this narrative review we performed an extensive literature search on the term "absence," and analyzed the plethora of symptoms observed in clinical absences...
January 11, 2018: Epilepsia
https://www.readbyqxmd.com/read/29321970/deepied-an-epileptic-discharge-detector-for-eeg-fmri-based-on-deep-learning
#2
Yongfu Hao, Hui Ming Khoo, Nicolas von Ellenrieder, Natalja Zazubovits, Jean Gotman
Presurgical evaluation that can precisely delineate the epileptogenic zone (EZ) is one important step for successful surgical resection treatment of refractory epilepsy patients. The noninvasive EEG-fMRI recording technique combined with general linear model (GLM) analysis is considered an important tool for estimating the EZ. However, the manual marking of interictal epileptic discharges (IEDs) needed in this analysis is challenging and time-consuming because the quality of the EEG recorded inside the scanner is greatly deteriorated compared to the usual EEG obtained outside the scanner...
2018: NeuroImage: Clinical
https://www.readbyqxmd.com/read/29288994/detecting-sub-second-changes-in-brain-activation-patterns-during-interictal-epileptic-spike-using-simultaneous-eeg-fmri
#3
Epifanio Bagarinao, Satoshi Maesawa, Yuji Ito, Naotaka Usui, Jun Natsume, Hirohisa Watanabe, Minoru Hoshiyama, Toshihiko Wakabayashi, Gen Sobue, Shinji Naganawa, Haruo Isoda
OBJECTIVE: Epileptic spikes are associated with rapidly changing brain activation involving the epileptic foci and other brain regions in the "epileptic network". We aim to resolve these activation changes using simultaneous electroencephalography (EEG) and functional magnetic resonance imaging (fMRI) recordings. METHODS: Simultaneous EEG-fMRI recordings from 9 patients with epilepsy were used in the analysis. Our method employed the whole scalp EEG data to generate regressors for the analysis of fMRI data using the general linear model...
November 27, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29245083/concordance-between-the-wada-test-and-neuroimaging-lateralization-influence-of-imaging-modality-fmri-and-meg-and-patient-experience
#4
Steven Kemp, Garreth Prendergast, Theodoros Karapanagiotidis, Gus Baker, Thomas P Kelly, Tufail Patankar, Simon S Keller
The Wada test remains the traditional test for lateralizing language and memory function prior to epilepsy surgery. Functional imaging, particularly functional MRI (fMRI), has made progress in the language domain, but less so in the memory domain. Magnetoencephalography (MEG) has received less research attention, but shows promise, particularly for language lateralization. We recruited a consecutive sample of 19 patients with epilepsy who had completed presurgical work-up, including the Wada test, and compared fMRI (memory) and MEG (language and memory) with Wada test results...
December 12, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/29240833/vagal-nerve-stimulation-triggers-widespread-responses-and-alters-large-scale-functional-connectivity-in-the-rat-brain
#5
Jiayue Cao, Kun-Han Lu, Terry L Powley, Zhongming Liu
Vagus nerve stimulation (VNS) is a therapy for epilepsy and depression. However, its efficacy varies and its mechanism remains unclear. Prior studies have used functional magnetic resonance imaging (fMRI) to map brain activations with VNS in human brains, but have reported inconsistent findings. The source of inconsistency is likely attributable to the complex temporal characteristics of VNS-evoked fMRI responses that cannot be fully explained by simplified response models in the conventional model-based analysis for activation mapping...
2017: PloS One
https://www.readbyqxmd.com/read/29213031/-neuronet-restructuring-in-focal-and-generalized-epilepsy-according-to-resting-state-fmri
#6
L A Mayorova, I S Samotaeva, N N Lebedeva, R V Luzin, V V Gaskin, F K Rider, A M Teplyshova, R G Akzhigitov, A B Guekht
AIM: To compare neuronet restructuring in focal and generalized epilepsy. MATERIAL AND METHODS: Seventy-seven patients, aged from 18 to 65 years, with the diagnosis of epilepsy, including 63 patients with focal epilepsy and 14 with generalized epilepsy, were examined. A control group included 23 healthy people. Neuronet restructuring was studied using fMRI. RESULTS AND CONCLUSION: According to resting state fMRI, there were between-group differences in spatial organization (activity map) of the brain structures as well as in the results of cross-correlation analysis of interaction maps of resting-state networks...
2017: Zhurnal Nevrologii i Psikhiatrii Imeni S.S. Korsakova
https://www.readbyqxmd.com/read/29203203/a-new-insight-into-sentence-comprehension-the-impact-of-word-associations-in-sentence-processing-as-shown-by-invasive-eeg-recording
#7
Elvira Khachatryan, Harm Brouwer, Willeke Staljanssens, Evelien Carrette, Alfred Meurs, Paul Boon, Dirk van Roost, Marc M Van Hulle
The effect of word association on sentence processing is still a matter of debate. Some studies observe no effect while others found a dependency on sentence congruity or an independent effect. In an attempt to separate the effects of sentence congruity and word association in the spatio-temporal domain, we jointly recorded scalp- and invasive-EEG (iEEG). The latter provides highly localized spatial (unlike scalp-EEG) and high temporal (unlike fMRI) resolutions. We recorded scalp- and iEEG in three patients with refractory epilepsy...
December 1, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/29113406/altered-dmn-functional-connectivity-and-regional-homogeneity-in-partial-epilepsy-patients-a-seventy-cases-study
#8
Chong-Yu Hu, Xiaoping Gao, Lili Long, Xiaoyan Long, Chaorong Liu, Yayu Chen, Yuanyuan Xie, Chujuan Liu, Bo Xiao, Zhe-Yu Hu
Purpose: Clinically diagnosed partial epilepsy is hard to be functionally diagnosed by regular electroencephalograph (EEG) and conventional magnetic resonance imaging (MRI). By collecting transient brain regional signals, blood oxygenation level-dependent (BOLD) function MRI (BOLD-fMRI) can provide brain function change information with high accuracy. By using resting state BOLD-fMRI technique, we aim to investigate the changes of brain function in partial epilepsy patients. Methods: BOLD-fMRI scanning was performed in 70 partial epilepsy and 70 healthy people...
October 6, 2017: Oncotarget
https://www.readbyqxmd.com/read/29103838/cognitive-and-behavioral-comorbidities-in-rolandic-epilepsy-and-their-relation-with-default-mode-network-s-functional-connectivity-and-organization
#9
Isabell Ofer, Julia Jacobs, Nathalie Jaiser, Burak Akin, J├╝rgen Hennig, Andreas Schulze-Bonhage, Pierre LeVan
OBJECTIVE: Rolandic epilepsy (RE) is characterized by typical interictal-electroencephalogram (EEG) patterns mainly localized in centrotemporal and parietooccipital areas. An aberrant intrinsic organization of the default mode network (DMN) due to repeated disturbances from spike-generating areas may be able to account for specific cognitive deficits and behavioral problems in RE. The aim of the present study was to investigate cognitive development (CD) and socioemotional development (SED) in patients with RE during active disease in relation to DMN connectivity and network topology...
November 2, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/29072554/functional-near-infrared-spectroscopy-is-in-moderate-accordance-with-functional-mri-in-determining-lateralisation-of-frontal-language-areas
#10
K M Arun, K A Smitha, P G Rajesh, Chandrasekharan Kesavadas
Purpose Understanding language dominance is crucial in pre-surgical evaluation of patients with epilepsy and in patients having a tumour close to the language area. Functional magnetic resonance imaging (fMRI) studies are well established in evaluating language dominance. Functional near-infrared spectroscopy (fNIRS) is a non-invasive optical imaging modality that offers a convenient and affordable technique to image language-related cortical areas. This study investigates the agreement between results from task-based fMRI and fNIRS in determining language lateralisation...
January 1, 2017: Neuroradiology Journal
https://www.readbyqxmd.com/read/29060892/sensorimotor-network-parcellation-for-pre-surgical-patients-using-low-pass-filtered-fmri
#11
Hao Han, Yuxiang Yan, Wenjing Zhou, Bo Hong
Pre-surgical mapping of sensorimotor and language functions is crucial to reduce neurological deficits in epilepsy and tumor resection surgery. As non-invasive mapping, both resting-state and task-evoked functional MRI has been explored in pre-surgical mapping. In lack of standardized test paradigm, the reliability of fMRI mapping is still a concern for clinical use. In this study, to improve the reliability of fMRI based mapping, task fMRI data from all available task paradigms (motor movement, word repeating and picture naming) were low-pass filtered in the band of resting-state fMRI (0...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29060718/spatially-regularized-multifractal-analysis-for-fmri-data
#12
Philippe Ciuciu, Herwig Wendt, Sebastien Combrexelle, Patrice Abry
Scale-free dynamics is nowadays a massively used paradigm to model infraslow macroscopic brain activity. Multifractal analysis is becoming the standard tool to characterize scale-free dynamics. It is commonly used on various modalities of neuroimaging data to evaluate whether arrhythmic fluctuations in ongoing or evoked brain activity are related to pathologies (Alzheimer, epilepsy) or task performance. The success of multifractal analysis in neurosciences remains however so far contrasted: While it lead to relevant findings on M/EEG data, less clear impact was shown when applied to fMRI data...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29057860/resting-state-fmri-findings-in-patients-with-first-episode-idiopathic-epilepsy-before-and-after-treatment
#13
Peng-Fei Qiao, Guang-Ming Niu
OBJECTIVE: To detect resting-state functional MRI (rsfMRI) changes and their relationships with the clinical curative effect of anti-epileptic drugs (AEDs) for complex partial seizures (CPS) in epilepsy patients using the fractional amplitude of low frequency fluctuation (fALFF). METHODS: rfMRI data from 14 CPS patients enrolled between June 2015 and June 2016 in Department of Neurology, Affiliated Hospital of Inner Mongolia Medical University were retrospectively investigated and compared with findings from 14 healthy age-, gender-, handedness-, and education-matched subjects...
October 2017: Neurosciences: the Official Journal of the Pan Arab Union of Neurological Sciences
https://www.readbyqxmd.com/read/29055867/pre-surgical-mapping-of-eloquent-cortex-for-paediatric-epilepsy-surgery-candidates-evidence-from-a-review-of-advanced-functional-neuroimaging
#14
REVIEW
Sarah Collinge, Garreth Prendergast, Steven T Mayers, David Marshall, Poppy Siddell, Elizabeth Neilly, Colin D Ferrie, Gayatri Vadlamani, Jeremy Macmullen-Price, Daniel J Warren, Arshad Zaman, Paul Chumas, John Goodden, Matthew C H J Morrall
PURPOSE: A review of all published evidence for mapping eloquent (motor, language and memory) cortex using advanced functional neuroimaging (functional magnetic resonance imaging [fMRI] and magnetoencephalography [MEG]) for paediatric epilepsy surgery candidates has not been conducted previously. Research in this area has predominantly been in adult populations and applicability of these techniques to paediatric populations is less established. METHODS: A review was performed using an advanced systematic search and retrieval of all published papers examining the use of functional neuroimaging for paediatric epilepsy surgery candidates...
November 2017: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/29033811/altered-local-spatiotemporal-consistency-of-resting-state-bold-signals-in-patients-with-generalized-tonic-clonic-seizures
#15
Shuai Ma, Sisi Jiang, Rui Peng, Qiong Zhu, Hongbin Sun, Jianfu Li, Xiaoyan Jia, Ilan Goldberg, Liang Yu, Cheng Luo
The purpose of this study was to evaluate the spatiotemporal Consistency of spontaneous activities in local brain regions in patients with generalized tonic-clonic seizures (GTCS). The resting-state fMRI data were acquired from nineteen patients with GTCS and twenty-two matched healthy subjects. FOur-dimensional (spatiotemporal) Consistency of local neural Activities (FOCA) metric was used to analyze the spontaneous activity in whole brain. The FOCA difference between two groups were detected using a two sample t-test analysis...
2017: Frontiers in Computational Neuroscience
https://www.readbyqxmd.com/read/29031866/connectivity-changes-after-laser-ablation-resting-state-fmri
#16
Varina L Boerwinkle, Aditya Vedantam, Sandi Lam, Angus A Wilfong, Daniel J Curry
Resting-state functional magnetic resonance imaging (rsfMRI) is emerging as a useful tool in the multimodal assessment of patients with epilepsy. In pediatric patients who cannot perform task-based fMRI, rsfMRI may present an adjunct and alternative. Although changes in brain activation during task-based fMRI have been described after surgery for epilepsy, there is limited data on the role of postoperative rsfMRI. In this short review, we discuss the role of postoperative rsfMRI after laser ablation of seizure foci...
September 28, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/29022116/two-dimensional-temporal-clustering-analysis-for-patients-with-epilepsy-detecting-epilepsy-related-information-in-eeg-fmri-concordant-discordant-and-spike-less-patients
#17
Danilo Maziero, Tonicarlo R Velasco, Carlos E G Salmon, Victoria L Morgan
EEG acquired simultaneously with fMRI (EEG-fMRI) is a multimodal method that has shown promise in mapping the seizure onset zone in patients with focal epilepsy. However, there are many instances when this method is unsuccessful or not applicable, and other data driven fMRI methods may be utilized. One such method is the two-dimensional temporal clustering analysis (2dTCA). In this study we compared the classic EEG-fMRI and 2dTCA performance in mapping regions related to the seizure onset region in 18 focal epilepsy patients (12 presenting interictal epileptiform discharges (IEDs), during EEG-fMRI acquisition) with Engel I or II surgical outcome...
October 11, 2017: Brain Topography
https://www.readbyqxmd.com/read/28971013/presurgical-thalamocortical-connectivity-is-associated-with-response-to-vagus-nerve-stimulation-in-children-with-intractable-epilepsy
#18
George M Ibrahim, Priya Sharma, Ann Hyslop, Magno R Guillen, Benjamin R Morgan, Simeon Wong, Taylor J Abel, Lior Elkaim, Iahn Cajigas, Ashish H Shah, Aria Fallah, Alexander G Weil, Nolan Altman, Byron Bernal, Santiago Medina, Elysa Widjaja, Prasanna Jayakar, John Ragheb, Sanjiv Bhatia
Although chronic vagus nerve stimulation (VNS) is an established treatment for medically-intractable childhood epilepsy, there is considerable heterogeneity in seizure response and little data are available to pre-operatively identify patients who may benefit from treatment. Since the therapeutic effect of VNS may be mediated by afferent projections to the thalamus, we tested the hypothesis that intrinsic thalamocortical connectivity is associated with seizure response following chronic VNS in children with epilepsy...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28959876/ultrasound-assisted-awake-epilepsy-surgery-for-type-iib-focal-cortical-dysplasia-in-eloquent-areas
#19
Matteo Martinoni, Gianluca Marucci, Stefano Meletti, Lilia Volpi, Roberto Michelucci, Marco Giulioni
INTRODUCTION: Focal cortical dysplasia (FCD) type IIb is a frequent cause of pharmacoresistant epilepsy. However, intraoperative identification of the pathological tissue still remains a challenge despite the use of neuronavigation, particularly when it lies in eloquent areas. CASE REPORT: We here report a case of intraoperative identification of a right frontal FCD type IIB through ultrasound assisted neuronavigation during awake surgery in a patient with drug-resistant epilepsy...
September 28, 2017: Journal of Neurosurgical Sciences
https://www.readbyqxmd.com/read/28952404/partial-resection-of-presurgical-fmri-activation-is-associated-with-a-postsurgical-loss-of-language-function-after-frontal-lobe-epilepsy-surgery
#20
Kirsten Labudda, Markus Mertens, Thilo Kalbhenn, Reinhard Schulz, Friedrich G Woermann
We describe five patients with frontal lobe epilepsy who underwent electrocortical stimulation (ES) for language localization and language functional magnetic resonance imaging (fMRI) prior to epilepsy surgery. Six months after surgery, three patients suffered from a drop of verbal fluency. In all of them, frontal areas with presurgical language fMRI activity were resected. Our results suggest that resection in regions of areas with presurgical fMRI activation is not without risk for a postsurgical loss of function, even when ES results were negative for language function in these areas...
September 27, 2017: Neurocase
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