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Intracranial EEG

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https://www.readbyqxmd.com/read/27907960/multimodality-monitoring-illuminating-the-comatose-human-brain
#1
Charles L Francoeur, Margaret Pain, Stephan A Mayer
The field of neurocritical care has evolved tremendously in recent years, a development explained vastly by the advent of neurophysiological monitoring. From basic intracranial pressure measurements to brain tissue oxygenation, microdialysis, cerebral blood flow (CBF), and surface and intracortical electroencephalography (EEG), our ability to detect and control physiologic endpoints of brain function in comatose patients has grown substantially. The integration of these data gave birth to the concept of multimodality monitoring (MMM)...
December 2016: Seminars in Neurology
https://www.readbyqxmd.com/read/27896067/relationship-between-high-frequency-oscillations-and-spikes-in-a-case-of-temporal-lobe-epilepsy
#2
Vishwanath Sagi, M Steven Evans
OBJECTIVE: The aim of this case report was to study the relationship between high-frequency oscillations (HFOs), spikes, and seizures in a patient with temporal lobe epilepsy. INTRODUCTION: During intracranial electroencephalography (EEG), HFOs are thought to be a marker for the seizure onset zone (SOZ). High-frequency oscillations are classified into ripples with frequencies of 70-200 Hz and fast ripples with frequencies of 200-500 Hz. Although HFOs are thought to be a marker for the SOZ, their relationship to spikes has not been studied in detail, especially within the SOZ...
2016: Epilepsy & Behavior Case Reports
https://www.readbyqxmd.com/read/27890748/small-unruptured-intracranial-aneurysm-%C3%A2-5mm-associated-with-epilepsy-report-of-2-cases-and-literature-review
#3
Fuxin Lin, Hui Wan, Dezhi Kang, Yuanxiang Lin
BACKGROUND: Due to the continuing improvements in imaging technology, an increasing number of epileptogenic small (≤5mm) unruptured intracranial aneurysms (sUIA) are being diagnosed since 2000. However, they are not systematically described and reviewed until now. CASE DESCRIPTION AND THE LITERATURE REVIEW: We reported 2 patients with sUIA who initially presented with complex partial seizures (CPS). Scalp electroencephalography (EEG) showed the seizures activity arising from the mesial temporal/frontal areas, but conventional magnetic resonance imaging (MRI) scans were normal in both patients...
November 24, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/27875126/epileptogenic-source-imaging-using-cross-frequency-coupled-signals-from-scalp-eeg
#4
Chunsheng Li, Daniel Jacobs, Trevor Hilton, Martin Del Campo, Yotin Chinvarun, Peter L Carlen, Berj L Bardakjian
OBJECTIVE: The epileptogenic zone (EZ) is a brain region containing the sources of seizure genesis. Removal of the EZ is associated with cessation of seizures after resective surgical procedures, as measured by Engel Class I score. This study describes a novel EEG (electroencephalography) source imaging (ESI) method which uses cross-frequency coupled potential signals (SCFC) derived from scalp EEG. METHODS: Scalp EEG were recorded from ten patients (20 seizures) suffering from epilepsy...
December 2016: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/27873554/a-realistic-seizure-prediction-study-based-on-multiclass-svm
#5
Bruno Direito, César A Teixeira, Francisco Sales, Miguel Castelo-Branco, António Dourado
A patient-specific algorithm, for epileptic seizure prediction, based on multiclass support-vector machines (SVM) and using multi-channel high-dimensional feature sets, is presented. The feature sets, combined with multiclass classification and post-processing schemes aim at the generation of alarms and reduced influence of false positives. This study considers 216 patients from the European Epilepsy Database, and includes 185 patients with scalp EEG recordings and 31 with intracranial data. The strategy was tested over a total of 16,729...
September 23, 2016: International Journal of Neural Systems
https://www.readbyqxmd.com/read/27870647/meg-may-reveal-hidden-population-of-spikes-in-epilepsy-with-porencephalic-cyst-encephalomalacia
#6
Yosuke Kakisaka, Zhong I Wang, Sumiya Shibata, Yoko Takahashi, John C Mosher, Andreas V Alexopoulos, Richard C Burgess
Porencephalic cyst/encephalomalacia (PC/E) is often associated with intractable epilepsy. A Limited number of studies reported Magnetoencephalography (MEG)'s potential to help construct treatment strategy for epilepsies associated with PC/E. We present here simultaneous EEG and MEG findings in three adult patients with pediatric-onset epilepsy due to PC/E. There were two types of spikes: one type was detected by MEG only (EEG-/MEG+), and the other detected by both EEG and MEG (EEG+/MEG+). Both types were seen in all three cases...
November 16, 2016: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/27859041/increased-subcortical-oligodendroglia-like-cells-in-pharmacoresistant-focal-epilepsy-in-children-correlate-with-extensive-epileptogenic-zones
#7
Satoru Sakuma, William C Halliday, Ruka Nomura, Shiro Baba, Yosuke Sato, Kazuo Okanari, Midori Nakajima, Elysa Widjaja, Cyrus Boelman, Ayako Ochi, O Carter Snead, James T Rutka, James Drake, Steven Miller, Hiroshi Otsubo
OBJECTIVE: Cortical resections in epilepsy surgery tend to involve multiple lobes in children, compared to adults, partly due to underlying pathology. Oligodendroglia-like cells (OLCs) have been observed in surgical specimens from children with pharmacoresistant epilepsy. We hypothesize that OLCs recruit multiple-lobe epileptogenic zones in pediatric pharmacoresistant focal epilepsy. METHODS: We examined the surgical specimens from 30 children who underwent epilepsy surgery (1...
November 8, 2016: Epilepsia
https://www.readbyqxmd.com/read/27859029/reactivation-of-seizure-related-changes-to-interictal-spike-shape-and-synchrony-during-postseizure-sleep-in-patients
#8
Mark R Bower, Michal T Kucewicz, Erik K St Louis, Fredric B Meyer, W Richard Marsh, Matt Stead, Gregory A Worrell
OBJECTIVE: Local field potentials (LFPs) arise from synchronous activation of millions of neurons, producing seemingly consistent waveform shapes and relative synchrony across electrodes. Interictal spikes (IISs) are LFPs associated with epilepsy that are commonly used to guide surgical resection. Recently, changes in neuronal firing patterns observed in the minutes preceding seizure onset were found to be reactivated during postseizure sleep, a process called seizure-related consolidation (SRC), due to similarities with learning-related consolidation...
November 18, 2016: Epilepsia
https://www.readbyqxmd.com/read/27845676/a-bidirectional-neural-interface-ic-with-chopper-stabilized-bioadc-array-and-charge-balanced-stimulator
#9
Elliot Greenwald, Ernest So, Qihong Wang, Mohsen Mollazadeh, Christoph Maier, Ralph Etienne-Cummings, Gert Cauwenberghs, Nitish Thakor
We present a bidirectional neural interface with a 4-channel biopotential analog-to-digital converter (bioADC) and a 4-channel current-mode stimulator in 180 nm CMOS. The bioADC directly transduces microvolt biopotentials into a digital representation without a voltage-amplification stage. Each bioADC channel comprises a continuous-time first-order ∆Σ modulator with a chopper-stabilized OTA input and current feedback, followed by a second-order comb-filter decimator with programmable oversampling ratio. Each stimulator channel contains two independent digital-to-analog converters for anodic and cathodic current generation...
November 8, 2016: IEEE Transactions on Biomedical Circuits and Systems
https://www.readbyqxmd.com/read/27833546/measures-of-coupling-between-neural-populations-based-on-granger-causality-principle
#10
REVIEW
Maciej Kaminski, Aneta Brzezicka, Jan Kaminski, Katarzyna J Blinowska
This paper shortly reviews the measures used to estimate neural synchronization in experimental settings. Our focus is on multivariate measures of dependence based on the Granger causality (G-causality) principle, their applications and performance in respect of robustness to noise, volume conduction, common driving, and presence of a "weak node." Application of G-causality measures to EEG, intracranial signals and fMRI time series is addressed. G-causality based measures defined in the frequency domain allow the synchronization between neural populations and the directed propagation of their electrical activity to be determined...
2016: Frontiers in Computational Neuroscience
https://www.readbyqxmd.com/read/27818371/ictal-spect-is-useful-in-localizing-the-epileptogenic-zone-in-infants-with-cortical-dysplasia
#11
Martin Kudr, Pavel Krsek, Bruno Maton, Stephen Malone, Alena Jahodova, Vladimir Komarek, Prasanna Jayakar, Michael Duchowny
AIMS: To assess the localizing value of ictal SPECT in very young epilepsy surgery candidates when cerebral haemodynamic responses are known to be immature. METHODS: We retrospectively studied 13 infants with intractable focal epilepsy caused by focal cortical dysplasia (FCD). Completeness of resection of the (1) ictal SPECT hyperperfusion zone and (2) cerebral cortex with prominent ictal and interictal abnormalities on intracranial EEG (ECoG or long-term invasive monitoring) and the MRI lesion, when present, were correlated with postoperative seizure outcome...
November 4, 2016: Epileptic Disorders: International Epilepsy Journal with Videotape
https://www.readbyqxmd.com/read/27816897/epileptic-networks-in-patients-with-bitemporal-epilepsy-the-role-of-seeg-for-the-selection-of-good-surgical-candidates
#12
REVIEW
L Di Vito, F Mauguière, H Catenoix, S Rheims, P Bourdillon, A Montavont, J Isnard
OBJECTIVE: In this study we investigated the electrical characteristics of seizures recorded by stereo-EEG (SEEG) in a cohort of patients with bitemporal lobe epilepsy (BTLE), in the attempt to verify the presence/absence of different seizure patterns and to identify good surgical candidates. METHODS: We retrospectively reviewed 14 consecutive patients with medically refractory BTLE confirmed by scalp video-EEG (VEEG) recording of bitemporal independent or non-lateralizing seizure onset...
October 24, 2016: Epilepsy Research
https://www.readbyqxmd.com/read/27816354/invasive-epilepsy-surgery-evaluation
#13
Stjepana Kovac, Vejay N Vakharia, Catherine Scott, Beate Diehl
Intracranial EEG (iEEG) recordings are widely used for the work up of pharmacoresistant epilepsy. Different iEEG recording techniques namely subdural grids, strips, depth electrodes and stereoencephalography (SEEG) are available with distinct limitations and advantages. Epilepsy centres mastering multiple techniques apply them in an individualised patient approach. These tools are used to map the seizure onset zone which is pivotal in approximating the epileptogenic zone, i.e. the zone which is indispensable for the generation of seizures and when resected will render the patient seizure free...
October 21, 2016: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/27769717/progressive-neuronal-activation-accompanies-epileptogenesis-caused-by-hippocampal-glutamine-synthetase-inhibition
#14
Benjamin Albright, Roni Dhaher, Helen Wang, Roa Harb, Tih-Shih W Lee, Hitten Zaveri, Tore Eid
Loss of glutamine synthetase (GS) in hippocampal astrocytes has been implicated in the causation of human mesial temporal lobe epilepsy (MTLE). However, the mechanism by which the deficiency in GS leads to epilepsy is incompletely understood. Here we ask how hippocampal GS inhibition affects seizure phenotype and neuronal activation during epilepsy development (epileptogenesis). Epileptogenesis was induced by infusing the irreversible GS blocker methionine sulfoximine (MSO) unilaterally into the hippocampal formation of rats...
October 18, 2016: Experimental Neurology
https://www.readbyqxmd.com/read/27766519/sparse-representation-based-emd-and-blda-for-automatic-seizure-detection
#15
Shasha Yuan, Weidong Zhou, Junhui Li, Qi Wu
Epilepsy is a serious chronic neurological disorder, which affects more than 50 million people worldwide, and automatic seizure detection on EEG recordings is extremely required in the diagnosis and monitoring of epilepsy. This paper presents a novel seizure detection method using sparse representation-based Earth Mover's Distance (SR-EMD). In the proposed algorithm, wavelet decomposition is executed on the original EEG recordings with five scales, and the scales 3, 4 and 5 are selected to structure the distributions of EEG signals...
October 20, 2016: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/27740473/noninvasive-electromagnetic-source-imaging-and-granger-causality-analysis-an-electrophysiological-connectome-econnectome-approach
#16
Abbas Sohrabpour, Shuai Ye, Gregory A Worrell, Wenbo Zhang, Bin He
OBJECTIVE: Combined source-imaging techniques and directional connectivity analysis can provide useful information about the underlying brain networks in a noninvasive fashion. Source-imaging techniques have been used successfully to either determine the source of activity or to extract source time-courses for Granger causality analysis, previously. In this work, we utilize source-imaging algorithms to both find the network nodes [regions of interest (ROI)] and then extract the activation time series for further Granger causality analysis...
December 2016: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/27736662/clinical-features-and-postoperative-seizure-outcome-in-patients-with-drug-resistant-gelastic-seizures-without-hypothalamic-hamartoma
#17
Camilo Gutierrez, Ali A Asadi-Pooya, Christopher T Skidmore, Steven D Tobochnik, Carla LoPinto-Khoury, Michael R Sperling
OBJECTIVES: The objective of this study was to describe the clinical characteristics and surgical outcome in patients with gelastic seizures without hypothalamic hamartoma. METHODS: We retrospectively reviewed all the video-EEG reports over a 5-year period (2007-2011) for the occurrence of the terms "laugh" or "giggle" in the text body. All the patients with at least one documented gelastic seizure at the epilepsy monitoring unit were studied. In patients who underwent epilepsy surgery, seizure outcomes were analyzed...
October 10, 2016: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/27732917/temporal-lobe-origin-is-common-in-patients-who-have-undergone-epilepsy-surgery-for-hypermotor-seizures
#18
Amir M Arain, Nabil J Azar, Andre H Lagrange, Michael McLean, Pradumna Singh, Hasan Sonmezturk, Peter Konrad, Joseph Neimat, Bassel Abou-Khalil
RATIONALE: Hypermotor seizures are most often reported from the frontal lobe but may also have temporal, parietal, or insular origin. We noted a higher proportion of patients with temporal lobe epilepsy in our surgical cohort who had hypermotor seizures. We evaluated the anatomic localization and surgical outcome in patient with refractory hypermotor seizures who had epilepsy surgery in our center. METHODS: We identified twenty three patients with refractory hypermotor seizures from our epilepsy surgery database...
October 9, 2016: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/27723936/ripples-on-spikes-show-increased-phase-amplitude-coupling-in-mesial-temporal-lobe-epilepsy-seizure-onset-zones
#19
Shennan A Weiss, Iren Orosz, Noriko Salamon, Stephanie Moy, Linqing Wei, Maryse A Van't Klooster, Robert T Knight, Ronald M Harper, Anatol Bragin, Itzhak Fried, Jerome Engel, Richard J Staba
OBJECTIVE: Ripples (80-150 Hz) recorded from clinical macroelectrodes have been shown to be an accurate biomarker of epileptogenic brain tissue. We investigated coupling between epileptiform spike phase and ripple amplitude to better understand the mechanisms that generate this type of pathologic ripple (pRipple) event. METHODS: We quantified phase amplitude coupling (PAC) between epileptiform electroencephalography (EEG) spike phase and ripple amplitude recorded from intracranial depth macroelectrodes during episodes of sleep in 12 patients with mesial temporal lobe epilepsy...
November 2016: Epilepsia
https://www.readbyqxmd.com/read/27722839/seizure-onset-mapping-based-on-time-variant-multivariate-functional-connectivity-analysis-of-high-dimensional-intracranial-eeg-a-kalman-filter-approach
#20
Octavian V Lie, Pieter van Mierlo
The visual interpretation of intracranial EEG (iEEG) is the standard method used in complex epilepsy surgery cases to map the regions of seizure onset targeted for resection. Still, visual iEEG analysis is labor-intensive and biased due to interpreter dependency. Multivariate parametric functional connectivity measures using adaptive autoregressive (AR) modeling of the iEEG signals based on the Kalman filter algorithm have been used successfully to localize the electrographic seizure onsets. Due to their high computational cost, these methods have been applied to a limited number of iEEG time-series (<60)...
October 8, 2016: Brain Topography
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