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Intracranial EEG

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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/28625947/intracranial-investigation-of-a-patient-with-nodular-heterotopia-and-hippocampal-sclerosis-dealing-with-a-dual-pathology
#2
Lady Diana Ladino, Chelsea Dash, Adam Wu, Jose Francisco Tellez-Zenteno
The pre-operative assessment and surgical management of patients with dual pathology is challenging. We describe a patient with drug-resistant focal epilepsy with hippocampal sclerosis and extensive periventricular nodular heterotopia in the same hemisphere. The semiology, scalp EEG, and imaging were divergent, but the presence of focal interictal and ictal epileptic discharges of the putative ictal onset zone resulted in successful localization of the epileptogenic zone. A less aggressive resection was performed based on intracranial EEG recording...
June 12, 2017: Epileptic Disorders: International Epilepsy Journal with Videotape
https://www.readbyqxmd.com/read/28623753/precuneal-epilepsy-clinical-features-and-surgical-outcome
#3
Adil Harroud, Olivier Boucher, Thi Phuoc Yen Tran, Louis Harris, Jeffery Hall, François Dubeau, Ismail Mohamed, Alain Bouthillier, Dang Khoa Nguyen
OBJECTIVE: The precuneus is a complex and highly connected structure located in the medial portion of the superior parietal lobule. The clinical presentation of precuneal epilepsy is poorly characterized, mostly because these patients have seldom been distinguished from those with other types of parietal lobe epilepsy. The present study aims to improve the understanding of precuneal epilepsy by detailing its clinical features and surgical outcomes. METHODS: Six previously unreported cases of drug-resistant precuneal epilepsy investigated between 2002 and 2014 were retrospectively studied...
June 14, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/28591822/neural-sources-and-underlying-mechanisms-of-neural-responses-to-heartbeats-and-their-role-in-bodily-self-consciousness-an-intracranial-eeg-study
#4
Hyeong-Dong Park, Fosco Bernasconi, Roy Salomon, Catherine Tallon-Baudry, Laurent Spinelli, Margitta Seeck, Karl Schaller, Olaf Blanke
Recent research has shown that heartbeat-evoked potentials (HEPs), brain activity in response to heartbeats, are a useful neural measure for investigating the functional role of brain-body interactions in cognitive processes including self-consciousness. In 2 experiments, using intracranial electroencephalography (EEG), we investigated (1) the neural sources of HEPs, (2) the underlying mechanisms for HEP generation, and (3) the functional role of HEPs in bodily self-consciousness. In Experiment-1, we found that shortly after the heartbeat onset, phase distributions across single trials were significantly concentrated in 10% of the recording sites, mainly in the insula and the operculum, but also in other regions including the amygdala and fronto-temporal cortex...
June 7, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28578510/trans-falcine-and-contralateral-sub-frontal-electrode-placement-in-pediatric-epilepsy-surgery-technical-note
#5
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/28574952/the-hippocampus-and-cortex-together-generate-the-scalp-eeg-ictal-discharge-in-temporal-lobe-epilepsy
#6
David G Vossler, Diana L Kraemer, Anthony J Bell
PURPOSE: The scalp EEG ictal discharge in temporal lobe epilepsy is reportedly visible only after the intracranial discharge becomes well synchronized and present over 10 to 30 cm of cortex. We investigated the role of the hippocampal formation in the generation of the scalp EEG ictal discharge. METHODS: Intracranial EEG video monitors were recorded using simultaneous scalp, stereotaxic depth, and subdural strip electrodes in 19 subjects with temporal lobe epilepsy...
May 30, 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
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
#7
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/28554147/seizure-prediction-in-patients-with-focal-hippocampal-epilepsy
#8
Ardalan Aarabi, Bin He
OBJECTIVE: We evaluated the performance of our previously developed seizure prediction approach on thirty eight seizures from ten patients with focal hippocampal epilepsy. METHODS: The seizure prediction system was developed based on the extraction of correlation dimension, correlation entropy, noise level, Lempel-Ziv complexity, largest Lyapunov exponent, and nonlinear interdependence from segments of intracranial EEG. RESULTS: Our results showed an average sensitivity of 86...
July 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28549276/different-seizure-onset-patterns-in-mesiotemporal-lobe-epilepsy-have-a-distinct-interictal-signature
#9
Birgit Frauscher, Nicolás von Ellenrieder, François Dubeau, Jean Gotman
OBJECTIVE: Experimental research demonstrated that distinct underlying mechanisms go along with different seizure-onset patterns on EEG. These different mechanisms may reflect different tissue abnormalities which, we hypothesize, could also be reflected in morphological differences in the interictal epileptic and background EEG activity. METHODS: We searched our database of intracranial EEG recordings for mesiotemporal lobe epilepsy patients with either predominant low-voltage fast activity (LVF) or periodic spiking (PS)...
July 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28531810/a-novel-scheme-for-the-validation-of-an-automated-classification-method-for-epileptic-spikes-by-comparison-with-multiple-observers
#10
Niraj K Sharma, Carlos Pedreira, Maria Centeno, Umair J Chaudhary, Tim Wehner, Lucas G S França, Tinonkorn Yadee, Teresa Murta, Marco Leite, Sjoerd B Vos, Sebastien Ourselin, Beate Diehl, Louis Lemieux
OBJECTIVE: To validate the application of an automated neuronal spike classification algorithm, Wave_clus (WC), on interictal epileptiform discharges (IED) obtained from human intracranial EEG (icEEG) data. METHOD: Five 10-min segments of icEEG recorded in 5 patients were used. WC and three expert EEG reviewers independently classified one hundred IED events into IED classes or non-IEDs. First, we determined whether WC-human agreement variability falls within inter-reviewer agreement variability by calculating the variation of information for each classifier pair and quantifying the overlap between all WC-reviewer and all reviewer-reviewer pairs...
July 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28526648/somatosensory-evoked-potentials-during-temporary-arterial-occlusion-for-intracranial-aneurysm-surgery-predictive-value-for-perioperative-stroke
#11
Ahmed I Kashkoush, Brian T Jankowitz, Paul Gardner, Robert M Friedlander, Yue-Fang Chang, Donald J Crammond, Jeffrey R Balzer, Parthasarathy D Thirumala
BACKGROUND: Temporary arterial occlusion (TAO) is a valuable tool for minimizing intraoperative rupture risk during intracranial aneurysm microsurgery; however, it may also be associated with ischemic injury. OBJECTIVE: This study aims to identify surgical and intraoperative neurophysiological monitoring (IONM) factors that predict perioperative stroke risk after TAO. METHODS: We performed a retrospective chart review of 177 intracranial aneurysm surgeries at our institution, in which TAO was performed before the placement of a permanent clip under monitoring with somatosensory evoked potentials (SSEPs) and electroencephalography (EEG)...
May 16, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28520631/operculo-insular-epilepsy-scalp-and-intracranial-electroencephalographic-findings
#12
Ariel Levy, Thi Phuoc Yen Tran, Olivier Boucher, Alain Bouthillier, Dang Khoa Nguyen
PURPOSE: Operculo-insular seizures are heterogeneous and may resemble seizures originating from the temporal, frontal, or parietal lobe. Although surface and invasive EEG recordings are often necessary to detect operculo-insular seizures, electrophysiological features of operculo-insular epilepsies remain poorly characterized. This study describes the EEG findings of patients with operculo-insular epilepsy. METHODS: We reviewed electrophysiological data of all patients (n = 9) with operculo-insular seizures revealed by intracranial EEG and for whom operculo-insular epilepsy was confirmed by good seizure outcome after resective or radiosurgery at our center between 2005 and 2013...
May 16, 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28495218/effects-of-hippocampal-low-frequency-stimulation-in-idiopathic-non-human-primate-epilepsy-assessed-via-a-remote-sensing-enabled-neurostimulator
#13
Thomas A Wozny, Witold J Lipski, Ahmad Alhourani, Efstathios D Kondylis, Arun Antony, R Mark Richardson
Individuals with pharmacoresistant epilepsy remain a large and under-treated patient population. Continued technologic advancements in implantable neurostimulators have spurred considerable research efforts directed towards the development of novel antiepileptic stimulation therapies. However, the lack of adequate preclinical experimental platforms has precluded a detailed understanding of the differential effects of stimulation parameters on neuronal activity within seizure networks. In order to chronically monitor seizures and the effects of stimulation in a freely-behaving non-human primate with idiopathic epilepsy, we employed a novel simultaneous video-intracranial EEG recording platform using a state-of-the-art sensing-enabled, rechargeable clinical neurostimulator with real-time seizure detection and wireless data streaming capabilities...
August 2017: Experimental Neurology
https://www.readbyqxmd.com/read/28491494/the-relationship-between-morphological-lesion-magnetic-source-imaging-and-intracranial-stereo-electroencephalography-in-focal-cortical-dysplasia
#14
Romain Bouet, François Mauguière, Sébastien Daligault, Jean Isnard, Marc Guenot, Olivier Bertrand, Julien Jung
Magnetoencephalography (MEG) is a useful non-invasive technique for presurgical evaluation of focal cortical dysplasia patients. We aimed at clarifying the precise spatial relationship between the spiking volume determined with MEG, the seizure onset zone and the lesional volume in patients with focal cortical dysplasia. We studied the spatial relationships between the MEG spiking volume determined with a recent analysis pipeline, the seizure-onset zone location determined with a quantitative index calculated from intracranial EEG signals ('Epileptogenicity Index') and the lesional volume delineated on brain MRI in 11 patients with Focal Cortical Dysplasia explored with Stereo-electroencephalography (SEEG)...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28486575/burst-suppression-ratio-underestimates-absolute-duration-of-electroencephalogram-suppression-compared-with-visual-analysis-of-intraoperative-electroencephalogram
#15
W G Muhlhofer, R Zak, T Kamal, B Rizvi, L P Sands, M Yuan, X Zhang, J M Leung
Background: Machine-generated indices based on quantitative electroencephalography (EEG), such as the patient state index (PSI™) and burst-suppression ratio (BSR), are increasingly being used to monitor intraoperative depth of anaesthesia in the endeavour to improve postoperative neurological outcomes, such as postoperative delirium (POD). However, the accuracy of the BSR compared with direct visualization of the EEG trace with regard to the prediction of POD has not been evaluated previously...
May 1, 2017: British Journal of Anaesthesia
https://www.readbyqxmd.com/read/28459693/real-time-epileptic-seizure-detection-using-eeg
#16
Lasitha S Vidyaratne, Khan M Iftekharuddin
This work proposes a novel patient-specific real-time automatic epileptic seizure onset detection, using both scalp and intracranial EEG. The proposed technique obtains harmonic multiresolution and self-similarity-based fractal features from EEG for robust seizure onset detection. A fast wavelet decomposition method, known as harmonic wavelet packet transform (HWPT), is computed based on Fourier transform to achieve higher frequency resolutions without recursive calculations. Similarly, fractal dimension (FD) estimates are obtained to capture self-similar repetitive patterns in the EEG signal...
April 25, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28459436/silent-hippocampal-seizures-and-spikes-identified-by-foramen-ovale-electrodes-in-alzheimer-s-disease
#17
Alice D Lam, Gina Deck, Alica Goldman, Emad N Eskandar, Jeffrey Noebels, Andrew J Cole
We directly assessed mesial temporal activity using intracranial foramen ovale electrodes in two patients with Alzheimer's disease (AD) without a history or EEG evidence of seizures. We detected clinically silent hippocampal seizures and epileptiform spikes during sleep, a period when these abnormalities were most likely to interfere with memory consolidation. The findings in these index cases support a model in which early development of occult hippocampal hyperexcitability may contribute to the pathogenesis of AD...
June 2017: Nature Medicine
https://www.readbyqxmd.com/read/28434238/the-characteristics-and-long-term-course-of-epilepsy-in-lipoid-proteinosis-a-spectrum-from-mild-to-severe-seizures-in-relation-to-ecm1-mutations
#18
Emel Oguz Akarsu, Firdevs Dinçsoy Bir, Can Baykal, Volkan Taşdemir, Bülent Kara, Nerses Bebek, Candan Gürses, Oya Uyguner, Betül Baykan
Lipoid proteinosis (LP) is a rare autosomal recessive disease characterized by deposition of hyaline material in skin and mucosae. Epilepsy, as an extracutaneous manifestation associated with typical mesial temporal calcifications, has already been identified, but its characteristics and long-term prognosis have not been thoroughly investigated. We included 7 consecutive patients with LP with typical intracranial calcifications out of 16 patients with ECM1 mutations and investigated the semiologic features, ictal and interictal EEG findings, and long-term prognosis of epilepsy in this genodermatosis...
April 1, 2017: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/28419327/epilepsy-surgeries-requiring-an-operculoinsular-cortectomy-operative-technique-and-results
#19
Alain Bouthillier, Dang Khoa Nguyen
BACKGROUND: Epilepsy surgeries requiring an operculoinsulectomy pose significant difficulties because the perisylvian area is highly vascular, deep, and functional. OBJECTIVE: To report the operative technique and results of epilepsy surgeries requiring an operculoinsular cortectomy at our institution. METHODS: The data of all consecutive patients who had undergone an epilepsy surgery requiring an operculoinsular cortectomy with a minimum follow-up of 1 yr were reviewed...
April 17, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28414967/pharmacodynamics-of-remifentanil-induced-intracranial-spike-activity-in-mesial-temporal-lobe-epilepsy
#20
Troels Wesenberg Kjaer, Hans Hogenhaven, Andrea P Lee, Flemming Find Madsen, Bo Jespersen, Jannick Brennum, Lennart Derm, Finn Borgbjerg Moltke
Patients with medically refractory epilepsy may benefit from resective epilepsy surgery. However even the best centers experience surgical failures. It is therefore important to find techniques that may aid in neurosurgical planning of epileptic focus resection. Recordings of electrical brain activity with EEG during seizures reveal abnormal cortical hypersynchronization. Between seizures the EEG often shows interictal depolarizing phenomena such as spikes reflecting an irritable focus of the brain. In the present study we investigated the effect of intravenous remifentanil on the spike activity in the temporal neocortex and hippocampus...
March 31, 2017: Epilepsy Research
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