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https://www.readbyqxmd.com/read/28150296/radiofrequency-thermocoagulation-of-the-seizure-onset-zone-during-stereoelectroencephalography
#1
Petia Dimova, Luca de Palma, Anne-Sophie Job-Chapron, Lorella Minotti, Dominique Hoffmann, Philippe Kahane
OBJECTIVE: To assess long-term outcome and identify prognostic factors of radiofrequency thermocoagulation (RFTC) following stereoelectroencephalography (SEEG) explorations in particularly complex cases of focal epilepsy. METHODS: We retrospectively reviewed the medical charts, video-SEEG recordings, and outcomes for 23 patients (aged 6-53 years) treated with SEEG-guided RFTC, of whom 15 had negative magnetic resonance imaging (MRI) findings, and 10 were considered noneligible for resective surgery after SEEG...
February 2, 2017: Epilepsia
https://www.readbyqxmd.com/read/28104438/safety-of-externally-stimulated-intracranial-electrodes-during-functional-mri-at-1-5t
#2
Pallab K Bhattacharyya, Jeffery Mullin, Bryan S Lee, Jorge A Gonzalez-Martinez, Stephen E Jones
Surgical resection of the epileptogenic zone (EZ) is a potential cure for medically refractory focal epilepsy. Proper identification of the EZ is essential for such resection. Synergistic application of functional magnetic resonance imaging (fMRI) simultaneously with stimulation of a single externalized intracranial stereotactic EEG (SEEG) electrode has the potential to improve identification of the EZ. While most EEG-fMRI studies use the electrodes passively to record electrical activity, it is possible to stimulate the brain using the electrodes by connecting them with conducting cables to the stimulation hardware...
January 16, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28099166/despiking-seeg-signals-reveals-dynamics-of-gamma-band-preictal-activity
#3
Nawel Jmail, Martine Gavaret, F Bartolomei, Christian-G Bénar
Interictal epileptiform discharges, or 'interictal spikes', are the hallmark of epilepsy. Still, there is growing evidence that oscillatory activity-whether in the gamma band (30-120 Hz) or at higher frequencies is another important marker of hyperexcitable tissues. A major difficulty arises from the fact that interictal spikes and oscillations overlap in the frequency domain. This hampers the correct delineation of the cortex producing pathological oscillations by simple filtering. Here, we propose a nonlinear technique for fitting the spike waveform in order to remove it, resulting in a 'despiked' signal...
January 18, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28097330/electroencephalographic-periodic-discharges-and-frequency-dependent-brain-tissue-hypoxia-in-acute-brain-injury
#4
Jens Witsch, Hans-Peter Frey, J Michael Schmidt, Angela Velazquez, Cristina M Falo, Michael Reznik, David Roh, Sachin Agarwal, Soojin Park, E Sander Connolly, Jan Claassen
Importance: Periodic discharges (PDs) that do not meet seizure criteria, also termed the ictal interictal continuum, are pervasive on electroencephalographic (EEG) recordings after acute brain injury. However, their association with brain homeostasis and the need for clinical intervention remain unknown. Objective: To determine whether distinct PD patterns can be identified that, similar to electrographic seizures, cause brain tissue hypoxia, a measure of ongoing brain injury...
January 9, 2017: JAMA Neurology
https://www.readbyqxmd.com/read/28088805/a-retrospective-analysis-of-stereoelectroencephalography-and-subdural-electroencephalography-for-preoperative-evaluation-of-intractable-epilepsy
#5
Meihua Yang, Yuanshi Ma, Wei Li, Xianjun Shi, Zhi Hou, Ning An, Chunqing Zhang, Lihong Liu, Hui Yang, Dong Zhang, Shiyong Liu
BACKGROUND: Different methods for intracranial electrode recording have various advantages and disadvantages, and controversy exists regarding the complications of stereoelectroencephalography (SEEG) and subdural EEG. OBJECTIVE: The purpose of this study was to determine the efficacy and safety of SEEG by comparing it with subdural EEG. METHODS: Data from 100 patients who underwent SEEG (n = 48) and subdural EEG (n = 52) to evaluate the epileptogenic zone were collected from June 2011 to June 2015...
January 14, 2017: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/28003163/stereo-electroencephalography-seeg-is-a-safe-procedure-including-for-insular-implantations
#6
Pierre Bourdillon, Philippe Ryvlin, Jean Isnard, Alexandra Montavont, Hélène Catenoix, François Mauguière, Sylvain Rheims, Karine Ostrowsky-Coste, Marc Guénot
No abstract text is available yet for this article.
December 18, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/27918347/the-stereo-electroencephalography-the-epileptogenic-zone
#7
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
#8
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
#9
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
#10
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)...
December 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
#11
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...
January 2017: Epilepsia
https://www.readbyqxmd.com/read/27833545/dynamic-network-connectivity-analysis-to-identify-epileptogenic-zones-based-on-stereo-electroencephalography
#12
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
#13
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
#14
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
#15
REVIEW
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...
January 2017: 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
#16
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
#17
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
#18
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
#19
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
#20
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
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