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https://www.readbyqxmd.com/read/27918347/the-stereo-electroencephalography-the-epileptogenic-zone
#1
Jorge A Gonzalez-Martinez
The stereo-electroencephalography (SEEG) methodology and technique was developed almost 60 years ago in Europe and it has proven its efficacy and safety over the last 55 years. The main advantage of the SEEG method is the possibility to study the epileptogenic neuronal network in its dynamic and tri-dimensional aspect, with an optimal time and space correlation with the clinical semiology. In this manuscript, the technical and methodological aspects of the SEEG will be discussed focusing on the planning of SEEG implantations, technical nuances, conceptualization of the epileptogenic zone, and the different methods of SEEG-guided surgical resections and ablations...
December 2016: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/27918345/stereoelectroencephalography-interpretation
#2
Juan C Bulacio, Patrick Chauvel, Aileen McGonigal
Intracranial EEG has been in use for more than 50 years in the presurgical evaluation of patients with medically intractable focal epilepsy. The stereoelectroencephalography (SEEG) method has expanded very significantly over the last 5 years, in parallel with the increase in the number of complex cases (i.e., MRI-negative) being referred with medically intractable focal epilepsy to major epilepsy surgery centers. Some centers with extensive experience in subdural electrodes are indeed changing or have changed to SEEG as the principal exploration technique, which suggests that SEEG might offer specific benefits through its approach to accurately localizing the epileptogenic zone...
December 2016: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/27918344/implantation-of-stereoelectroencephalography-electrodes-a-systematic-review
#3
Francesco Cardinale, Giuseppe Casaceli, Fabio Raneri, Jonathan Miller, Giorgio Lo Russo
BACKGROUND: Stereoelectroencephalography (SEEG) was developed by Talairach and Bancaud in Paris in the late 1950s. Subsequently, the Talairach methodology was adopted at a number of additional centers in Europe and Canada. Technical aspects remained essentially unchanged for the following 30 years. Only in the last two decades, because of advancements in image-guided surgery systems, robotics, and computer-aided planning, use of SEEG has become more widespread, and reports describing these new developments have been published...
December 2016: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/27861778/correlation-of-fdg-pet-hypometabolism-and-seeg-epileptogenicity-mapping-in-patients-with-drug-resistant-focal-epilepsy
#4
Florence Lamarche, Anne-Sophie Job, Pierre Deman, Manik Bhattacharjee, Dominique Hoffmann, Céline Gallazzini-Crépin, Sandrine Bouvard, Lorella Minotti, Philippe Kahane, Olivier David
OBJECTIVE: Interictal [18F]fluorodeoxyglucose-positron emission tomography (FDG-PET) is used in the presurgical evaluation of patients with drug-resistant focal epilepsy. We aimed at clarifying its relationships with ictal high-frequency oscillations (iHFOs) shown to be a relevant marker of the seizure-onset zone. METHODS: We studied the correlation between FDG-PET and epileptogenicity maps in an unselected series of 37 successive patients having been explored with stereo-electroencephalography (SEEG)...
November 8, 2016: Epilepsia
https://www.readbyqxmd.com/read/27859033/stereo-electroencephalography-guided-radiofrequency-thermocoagulation-seeg-guided-rf-tc-in-drug-resistant-focal-epilepsy-results-from-a-10-year-experience
#5
Pierre Bourdillon, Jean Isnard, Hélène Catenoix, Alexandra Montavont, Sylvain Rheims, Philippe Ryvlin, Karine Ostrowsky-Coste, François Mauguiere, Marc Guénot
OBJECTIVE: Stereo electroencephalography (SEEG)-guided radiofrequency thermocoagulation (SEEG-guided RF-TC) has been proposed since 2004 as a possible treatment of some focal drug-resistant epilepsy. The aim of this study is to provide extensive data about efficacy and safety of SEEG-guided RF-TC. METHODS: Over a 10-year period, 162 patients with drug-resistant focal epilepsy were eligible for SEEG-guided RF-TG during phase II invasive investigation by SEEG. All follow-up and safety data were collected prospectively...
November 16, 2016: Epilepsia
https://www.readbyqxmd.com/read/27833545/dynamic-network-connectivity-analysis-to-identify-epileptogenic-zones-based-on-stereo-electroencephalography
#6
Jun-Wei Mao, Xiao-Lai Ye, Yong-Hua Li, Pei-Ji Liang, Ji-Wen Xu, Pu-Ming Zhang
Objectives: Accurate localization of epileptogenic zones (EZs) is essential for successful surgical treatment of refractory focal epilepsy. The aim of the present study is to investigate whether a dynamic network connectivity analysis based on stereo-electroencephalography (SEEG) signals is effective in localizing EZs. Methods: SEEG data were recorded from seven patients who underwent presurgical evaluation for the treatment of refractory focal epilepsy and for whom the subsequent resective surgery gave a good outcome...
2016: Frontiers in Computational Neuroscience
https://www.readbyqxmd.com/read/27816897/epileptic-networks-in-patients-with-bitemporal-epilepsy-the-role-of-seeg-for-the-selection-of-good-surgical-candidates
#7
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...
December 2016: Epilepsy Research
https://www.readbyqxmd.com/read/27816896/simultaneous-seeg-meg-eeg-recordings-overcome-the-seeg-limited-spatial-sampling
#8
Martine Gavaret, Anne-Sophie Dubarry, Romain Carron, Fabrice Bartolomei, Agnès Trébuchon, Christian-George Bénar
During presurgical evaluation of pharmacoresistant partial epilepsies, stereoelectroencephalography (SEEG) records interictal and ictal activities directly but is inherently limited in spatial sampling. In contrast, scalp-EEG and MEG are less sensitive but provide a global view on brain activity. Therefore, recording simultaneously these three modalities should provide a better understanding of the underlying brain sources by taking advantage of the different sensitivities of the three recording techniques...
December 2016: Epilepsy Research
https://www.readbyqxmd.com/read/27816354/invasive-epilepsy-surgery-evaluation
#9
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/27753735/tirda-originating-from-lateral-temporal-cortex-in-a-patient-with-mtle-is-not-related-to-hippocampal-activity
#10
Anna Serafini, Naoum P Issa, Sandra Rose, Shasha Wu, Peter Warnke, James X Tao
Electrophysiological studies have suggested that temporal intermittent rhythmic delta activity (TIRDA) has a localizing value similar to interictal spikes in patients with temporal lobe epilepsy and is associated with a favorable outcome after temporal lobectomy. However, it remains controversial whether TIRDA is an EEG marker for mesial or lateral temporal epileptogenesis. We simultaneously recorded scalp EEG and stereoencephalography in a patient with mesial temporal lobe epilepsy during epilepsy presurgical evaluation...
December 2016: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/27611442/utility-of-electroencephalography-experience-from-a-u-s-tertiary-care-medical-center
#11
Kapil Gururangan, Babak Razavi, Josef Parvizi
OBJECTIVE: To investigate the utility of electroencephalography (EEG) for evaluation of patients with altered mental status (AMS). METHODS: We retrospectively reviewed 200 continuous EEGs (cEEGs) obtained in ICU and non-ICU wards and 100 spot EEGs (sEEGs) obtained from the emergency department (ED) of a large tertiary medical center. Main outcomes were access time (from study request to hookup), and diagnostic yield (percentage of studies revealing significant abnormality)...
October 2016: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/27524194/-functional-mapping-of-the-insular-and-opercular-cortex-a-study-using-seeg-electrical-stimulation-in-epileptic-patients
#12
H X Wang, B Q Zhang, J L Lin, X C Song, J Ruan, Y O Liu, J He, Z H Sun, W J Zhou
OBJECTIVE: Insular and opercular cortex is involved in complicated physiological function.Insular seizures involve extensive epileptic network, which results in the complex and diverse semiology.Electrical cortical stimulation(ECS) can explore the functional mapping and symptomatogenic zone. METHODS: The clinical presurgical evaluation and ECS data of 20 patients whose electrode contacts were located in the insular and opercular were analyzed retrospectively.CT scan/3D MRI data fusion was performed in order to accurately identify and locate each contact and check the electrode trajectory by the MRI images performed after the electrodes were removed...
August 2, 2016: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/27497814/how-does-vagal-nerve-stimulation-vns-change-eeg-brain-functional-connectivity
#13
Fabrice Bartolomei, Francesca Bonini, Elsa Vidal, Agnes Trébuchon, Stanislas Lagarde, Isabelle Lambert, Aileen McGonigal, Didier Scavarda, Romain Carron, Christian G Benar
An effect of vagal nerve stimulation (VNS) on cortical synchronization has been postulated but remains to be verified. In this study we investigated the impact of VNS on functional connectivity (Fc) using direct intracerebral recordings (stereotactic EEG, SEEG). Five patients with epilepsy who underwent SEEG recordings during ongoing VNS therapy were investigated. Interdependencies between twenty-six selected bipolar SEEG channels were estimated by nonlinear regression analysis during ON and OF periods of stimulation...
October 2016: Epilepsy Research
https://www.readbyqxmd.com/read/27485172/thalamic-interictal-epileptiform-discharges-in-deep-brain%C3%A2-stimulated-epilepsy-patients
#14
Catherine M Sweeney-Reed, Harim Lee, Stefan Rampp, Tino Zaehle, Lars Buentjen, Juergen Voges, Martin Holtkamp, Hermann Hinrichs, Hans-Jochen Heinze, Friedhelm C Schmitt
The relationships between interictal epileptiform discharges (IEDs) in the anterior (ANT) and dorsomedial nuclei (DMNT) of the thalamus and electro-clinical parameters in pharmacoresistant focal epilepsy patients receiving intrathalamic electrodes for deep brain stimulation (DBS) were investigated. Thalamus-localized IEDs (LIEDs) and surface EEG (sEEG)-IEDs were evaluated in eight patients who underwent ANT-DBS. Occurrence and frequency of ANT- and DMNT-LIEDs and pre-operative sEEG-IEDs were examined with respect to seizure onset location and seizure outcome following ANT-DBS...
October 2016: Journal of Neurology
https://www.readbyqxmd.com/read/27477535/the-virtual-epileptic-patient-individualized-whole-brain-models-of-epilepsy-spread
#15
V K Jirsa, T Proix, D Perdikis, M M Woodman, H Wang, J Gonzalez-Martinez, C Bernard, C Bénar, M Guye, P Chauvel, F Bartolomei
Individual variability has clear effects upon the outcome of therapies and treatment approaches. The customization of healthcare options to the individual patient should accordingly improve treatment results. We propose a novel approach to brain interventions based on personalized brain network models derived from non-invasive structural data of individual patients. Along the example of a patient with bitemporal epilepsy, we show step by step how to develop a Virtual Epileptic Patient (VEP) brain model and integrate patient-specific information such as brain connectivity, epileptogenic zone and MRI lesions...
July 28, 2016: NeuroImage
https://www.readbyqxmd.com/read/27469526/the-role-of-sub-hippocampal-versus-hippocampal-regions-in-bitemporal-lobe-epilepsies
#16
Sandrine Aubert, Francesca Bonini, Jonathan Curot, Luc Valton, William Szurhaj, Philippe Derambure, Sylvain Rheims, Philippe Ryvlin, Fabrice Wendling, Aileen McGonigal, Agnes Trébuchon, Fabrice Bartolomei
OBJECTIVE: We aimed at better delineating the functional anatomical organization of bitemporal lobe epilepsy. METHODS: We studied the epileptogenic zone (EZ) by quantifying the epileptogenicity of brain structures explored by depth electrodes in patients investigated by stereoelectroencephalography (SEEG). We compared 15 patients with bilateral mesial temporal lobe epilepsy (BTLE) and 15 patients with unilateral mesial temporal lobe epilepsy (UTLE). This quantification was performed using the 'Epileptogenicity Index' (EI)...
September 2016: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/27454330/occipital-and-occipital-plus-epilepsies-a-study-of-involved-epileptogenic-networks-through-seeg-quantification
#17
Angela Marchi, Francesca Bonini, Stanislas Lagarde, Aileen McGonigal, Martine Gavaret, Didier Scavarda, Romain Carron, Sandrine Aubert, Nathalie Villeneuve, Samuel Médina Villalon, Christian Bénar, Agnes Trebuchon, Fabrice Bartolomei
Compared with temporal or frontal lobe epilepsies, the occipital lobe epilepsies (OLE) remain poorly characterized. In this study, we aimed at classifying the ictal networks involving OLE and investigated clinical features of the OLE network subtypes. We studied 194 seizures from 29 consecutive patients presenting with OLE and investigated by stereoelectroencephalography (SEEG). Epileptogenicity of occipital and extraoccipital regions was quantified according to the 'epileptogenicity index' (EI) method. We found that 79% of patients showed widespread epileptogenic zone organization, involving parietal or temporal regions in addition to the occipital lobe...
September 2016: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/27406939/seizure-onset-patterns-in-focal-cortical-dysplasia-and-neurodevelopmental-tumors-relationship-with-surgical-prognosis-and-neuropathologic-subtypes
#18
Stanislas Lagarde, Francesca Bonini, Aileen McGonigal, Patrick Chauvel, Martine Gavaret, Didier Scavarda, Romain Carron, Jean Régis, Sandrine Aubert, Nathalie Villeneuve, Bernard Giusiano, Dominique Figarella-Branger, Agnès Trebuchon, Fabrice Bartolomei
OBJECTIVES: The study of intracerebral electroencephalography (EEG) seizure-onset patterns is crucial to accurately define the epileptogenic zone and guide successful surgical resection. It also raises important pathophysiologic issues concerning mechanisms of seizure generation. Until now, several seizure-onset patterns have been described using distinct recording methods (subdural, depth electrode), mostly in temporal lobe epilepsies or with heterogeneous neocortical lesions. METHODS: We analyzed data from a cohort of 53 consecutive patients explored by stereoelectroencephalography (SEEG) and with pathologically confirmed malformation of cortical development (MCD; including focal cortical dysplasia [FCD] and neurodevelopmental tumors [NDTs])...
September 2016: Epilepsia
https://www.readbyqxmd.com/read/27401930/smile-and-laughter-elicited-by-electrical-stimulation-of-the-frontal-operculum
#19
F Caruana, F Gozzo, V Pelliccia, M Cossu, P Avanzini
Laughter and smile are typical expressions of mirth and fundamental means of social communication. Despite their general interest, the current knowledge about the brain regions involved in the production of these expressions is still very limited, and the principal insights come from electrical stimulation (ES) studies in patients, in which, nevertheless, laughter or smile have been elicited very rarely. Previous studies showed that laughter is evoked by the stimulation of nodes of an emotional network encompassing the anterior cingulate, the superior frontal and basal temporal cortex...
August 2016: Neuropsychologia
https://www.readbyqxmd.com/read/27399570/373%C3%A2-is-stereotacticelectroencephalography-safe-a-systematic-review-and-meta-analysis-of-stereo-electroencephalography-related-complications
#20
Jeffrey Paul Mullin, Michael Shriver, Soha Abdu Alomar, Imad Najm, Jorge Alvaro Gonzalez-Martinez
INTRODUCTION: Stereotacticelectroencephalography (SEEG) is a procedure performed to define the epileptogenic zone in medically refractory epilepsy patients. Despite not requiring a craniotomy, intracerebral electrodes have gained a reputation of a "relatively high morbidity" associated with their placement. The goal of this study is to be the first to quantitatively review the incidence of various surgical complications associated with SEEG electrode implantation in the literature and to provide a summary estimate...
August 2016: Neurosurgery
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