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https://www.readbyqxmd.com/read/29143307/considerations-in-performing-and-analyzing-the-responses-of-cortico-cortical-evoked-potentials-in-stereo-eeg
#1
REVIEW
David Prime, David Rowlands, Steven O'Keefe, Sasha Dionisio
This review aims to highlight key considerations when performing cortico-cortical evoked potentials (CCEPs) using stereo-electroencephalography (SEEG) for network mapping and show its clinical applicability to presurgical evaluations. The parameters for performing stimulation and safety aspects have been investigated in electrocorticography (ECoG) and deep brain stimulation (DBS), but not as extensively in SEEG. A review of current literature was performed, with an attempt made to emphasize practical insights from all modalities of intracranial stimulation...
November 16, 2017: Epilepsia
https://www.readbyqxmd.com/read/29128469/the-different-patterns-of-seizure-induced-aphasia-in-temporal-lobe-epilepsies
#2
Agnès Trebuchon, Isabelle Lambert, Bernard Guisiano, Aileen McGonigal, Charline Perot, Francesca Bonini, Romain Carron, Catherine Liegeois-Chauvel, Patrick Chauvel, Fabrice Bartolomei
OBJECTIVES: Ictal language disturbances may occur in dominant hemisphere temporal lobe epilepsy (TLE), but little is known about the precise anatomoelectroclinical correlations. This study investigated the different facets of ictal aphasia in intracerebrally recorded TLE. METHODS: Video-stereoelectroencephalography (SEEG) recordings of 37 seizures in 17 right-handed patients with drug-resistant TLE were analyzed; SEEG electroclinical correlations between language disturbance and involvement of temporal lobe structures were assessed...
November 8, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/29125946/a-stereo-eeg-study-in-a-patient-with-sleep-related-hypermotor-epilepsy-due-to-depdc5-mutation
#3
Lorenzo Ferri, Francesca Bisulli, Roberto Mai, Laura Licchetta, Chiara Leta, Lino Nobili, Barbara Mostacci, Tommaso Pippucci, Paolo Tinuper
PURPOSE: Dishevelled EGL-10 and pleckstrin domain-containing protein 5 (DEPDC5) mutations are found in a wide spectrum of focal epilepsies ranging from epilepsy caused by malformation of cortical development to non-lesional epilepsy, including sleep-related hypermotor epilepsy (SHE). A surgical approach has been anecdotally reported in patients with DEPDC5 mutations, but most of these cases had a lesional etiology. METHODS: We describe a stereo-EEG (SEEG) study in a patient with drug-resistant/non-lesional SHE...
November 4, 2017: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/29117337/seeg-is-a-safe-procedure-for-a-comprehensive-anatomic-exploration-of-the-insula-a-retrospective-study-of-108-procedures-representing-254-transopercular-insular-electrodes
#4
Anne Laure Salado, Laurent Koessler, Gabriel De Mijolla, Emmanuelle Schmitt, Jean-Pierre Vignal, Thierry Civit, Louise Tyvaert, Jacques Jonas, Louis Georges Maillard, Sophie Colnat- Coulbois
BACKGROUND: The exploration of the insula in pre-surgical evaluation of epilepsy is considered to be associated with a high vascular risk resulting in an incomplete exploration of the insular cortex. OBJECTIVE: To report a retrospective observational study of insular exploration using stereoelectroencephalography (sEEG) with transopercular and parasagittal oblique intracerebral electrodes from January 2008 to January 2016. The first purpose of this study was to evaluate the surgical risks of insular cortex sEEG exploration...
May 9, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/29111409/mulan-evaluation-and-ensemble-statistical-inference-for-functional-connectivity
#5
Huifang E Wang, Karl J Friston, Christian G Bénar, Marmaduke M Woodman, Patrick Chauvel, Viktor Jirsa, Christophe Bernard
Many analysis methods exist to extract graphs of functional connectivity from neuronal networks. Confidence in the results is limited because, (i) different methods give different results, (ii) parameter setting directly influences the final result, and (iii) systematic evaluation of the results is not always performed. Here, we introduce MULAN (MULtiple method ANalysis), which assumes an ensemble based approach combining multiple analysis methods and fuzzy logic to extract graphs with the most probable structure...
October 27, 2017: NeuroImage
https://www.readbyqxmd.com/read/29076417/epilepsy-and-neurosurgery-historical-highlights
#6
Marianna Karamanou, Gregory Tsoucalas, Marios Themistocleous, Dimitrios Giakoumettis, George Stranjalis, George Androutsos
Epilepsy has been known since antiquity and trepanation has been documented as a therapeutic option. The Greek born physician Aretaeus of Cappadocia (2nd century BC) was the first to recommend trepanation for the treatment of refractory epilepsy to drugs, pointing out the efficacy of the method. Trepanation was practiced throughout the Middle Ages, as it is proved by the book of "Quattuor Magistri" and during Renaissance as well. In 19th century, Sir Victor Alexander Horsley (1857-1916), combining analysis of clinical presentation with cortical stimulation, performed a series of craniotomies for the treatment of epilepsy...
October 24, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/29060677/localization-of-stereo-electroencephalography-signals-using-a-finite-difference-complete-electrode-model
#7
Damon E Hyde, Xavier Tomas-Fernandez, Scellig S Stone, Jurriaan Peters, Simon K Warfield
Surgical intervention in epilepsy aims to eliminate seizures in refractory patients by resecting the tissue responsible for seizure onset. Stereo-electroencephalography (sEEG) provides highly accurate but invasive electrophysiological measurements using narrow multi-contact electrodes implanted stereotactically through small holes in the skull. However, the three dimensional nature of sEEG measurements make observed seizure onsets difficult to associate with physical cortical regions. Three dimensional source localization from sEEG measurements can improve the interpretation of this data, but requires more accurate modeling as compared to localization from scalp EEG...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29060612/nonmotor-regions-encode-path-related-information-during-movements
#8
Macauley S Breault, Pierre Sacre, Jacob J Johnson, Matthew Kerr, Matthew D Johnson, Juan Bulacio, Jorge Gonzalez-Martinez, Sridevi V Sarma, John T Gale
Sensorimotor control and the involvement of motor brain regions has been extensively studied, but the role nonmotor brain regions play during movements has been overlooked. This is particularly due to the difficulty of recording from multiple regions in the brain during motor control. In this study, we utilize stereoelectroencephalography (SEEG) recording techniques to explore the role nonmotor brain areas have on the way we move. Nine humans were implanted with SEEG depth electrodes for clinical purposes, which rendered access to local field potential (LFP) activity in deep and peripheral nonmotor structures...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29060480/linear-time-varying-model-characterizes-invasive-eeg-signals-generated-from-complex-epileptic-networks
#9
Adam Li, Kristin M Gunnarsdottir, Sara Inati, Kareem Zaghloul, John Gale, Juan Bulacio, Jorge Martinez-Gonzalez, Sridevi V Sarma
Electrocorticography (ECoG) and stereotactic electroencephalography (SEEG) are popular tools for studying neural mechanisms governing behavior and neural disorders, such as epilepsy. In particular, clinicians are interested in identifying brain regions that start seizures, i.e., the epileptogenic zone (EZ) from such invasive recordings. Currently, they visually inspect signals from each electrode to locate abnormal activity, and are not informed by predictive models that can characterize such recordings and potentially increase accuracy in localizing the EZ...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29060406/the-role-of-nonmotor-brain-regions-during-human-motor-control
#10
Jacob J Johnson, Macauley S Breault, Pierre Sacre, Matthew S D Kerr, Mathew Johnson, Juan Bulacio, Jorge Gonzalez-Martinez, Sridevi V Sarma, John T Gale
Neural prostheses have generally relied on signals from cortical motor regions to control reaching movements of a robotic arm. However, little work has been done in exploring the involvement of nonmotor cortical and associative regions during motor tasks. In this study, we identify regions which may encode direction during planning and movement of a center-out motor task. Local field potentials were collected using stereoelectroencephalography (SEEG) from nine epilepsy patients implanted with multiple depth electrodes for clinical purposes...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29059488/stereoelectroencephalography-and-surgical-outcome-in-polymicrogyria-related-epilepsy-a-multicentric-study
#11
Louis Georges Maillard, Laura Tassi, Fabrice Bartolomei, Hélène Catenoix, François Dubeau, William Szurhaj, Philippe Kahane, Anca Nica, Petr Marusic, Ioana Mindruta, Francine Chassoux, Georgia Ramantani
OBJECTIVE: We aimed to (1) assess the concordance between various polymicrogyria (PMG) types and the associated epileptogenic zone (EZ), as defined by stereoelectroencephalography (SEEG), and (2) determine the postsurgical seizure outcome in PMG-related drug-resistant epilepsy. METHODS: We retrospectively analyzed 58 cases: 49 had SEEG and 39 corticectomy or hemispherotomy. RESULTS: Mean age at SEEG or surgery was 28.3 years (range, 2-50)...
October 23, 2017: Annals of Neurology
https://www.readbyqxmd.com/read/29039074/the-usefulness-of-stereo-electroencephalography-seeg-in-the-surgical-management-of-focal-epilepsy-associated-with-hidden-temporal-pole-encephalocele-a-case-report-and-literature-review
#12
João Paulo Sant Ana Santos de Souza, Jeff Mullin, Connor Wathen, Juan Bulacio, Patrick Chauvel, Lara Jehi, Jorge Gonzalez-Martinez
The authors report a case of 18-year-old woman with partial complex seizures compatible with temporal epilepsy by semiology. Due to medical refractoriness, she was referred to pre-surgical evaluation. Initially, MRI showed no significant structural abnormality and superficial scalp EEG demonstrated epileptiform activity in the frontotemporal areas. Due to the lack of clear MRI abnormalities and the potential involvement of dominant mesial temporal structures by seizure semiology and non-invasive data, extra-operative invasive evaluation using stereo-electroencephalography (SEEG) methodology was indicated...
October 16, 2017: Neurosurgical Review
https://www.readbyqxmd.com/read/29024235/topography-and-timing-of-activity-in-right-inferior-frontal-cortex-and-anterior-insula-for-stopping-movement
#13
Eleonora Bartoli, Adam R Aron, Nitin Tandon
Stopping incipient action activates both the right inferior frontal cortex (rIFC) and the anterior insula (rAI). Controversy has arisen as to whether these comprise a unitary cortical cluster-the rIFC/rAI-or whether rIFC is the primary stopping locus. To address this, we recorded directly from these structures while taking advantage of the high spatiotemporal resolution of closely spaced stereo-electro-encephalographic (SEEG) electrodes. We studied 12 patients performing a stop-signal task. On each trial they initiated a motor response (Go) and tried to stop to an occasional stop signal...
October 11, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28990168/automated-analysis-of-seizure-semiology-and-brain-electrical-activity-in-presurgery-evaluation-of-epilepsy-a-focused-survey
#14
REVIEW
David Ahmedt-Aristizabal, Clinton Fookes, Sasha Dionisio, Kien Nguyen, João Paulo S Cunha, Sridha Sridharan
Epilepsy being one of the most prevalent neurological disorders, affecting approximately 50 million people worldwide, and with almost 30-40% of patients experiencing partial epilepsy being nonresponsive to medication, epilepsy surgery is widely accepted as an effective therapeutic option. Presurgical evaluation has advanced significantly using noninvasive techniques based on video monitoring, neuroimaging, and electrophysiological and neuropsychological tests; however, certain clinical settings call for invasive intracranial recordings such as stereoelectroencephalography (SEEG), aiming to accurately map the eloquent brain networks involved during a seizure...
November 2017: Epilepsia
https://www.readbyqxmd.com/read/28983921/epileptogenic-networks-in-nodular-heterotopia-a-stereoelectroencephalography-study
#15
Francesca Pizzo, Nicolas Roehri, Hélène Catenoix, Samuel Medina, Aileen McGonigal, Bernard Giusiano, Romain Carron, Didier Scavarda, Karine Ostrowsky, Anne Lepine, Sébastien Boulogne, Julia Scholly, Edouard Hirsch, Sylvain Rheims, Christian-George Bénar, Fabrice Bartolomei
OBJECTIVE: Defining the roles of heterotopic and normotopic cortex in the epileptogenic networks in patients with nodular heterotopia is challenging. To elucidate this issue, we compared heterotopic and normotopic cortex using quantitative signal analysis on stereoelectroencephalography (SEEG) recordings. METHODS: Clinically relevant biomarkers of epileptogenicity during ictal (epileptogenicity index; EI) and interictal recordings (high-frequency oscillation and spike) were evaluated in 19 patients undergoing SEEG...
October 6, 2017: Epilepsia
https://www.readbyqxmd.com/read/28961938/implantation-of-depth-electrodes-in-children-using-varioguide%C3%A2-frameless-navigation-system-technical-note
#16
Marcelo Budke, Josue M Avecillas-Chasin, Francisco Villarejo
BACKGROUND: Electrode placement in epilepsy surgery seeks to locate the sites of ictal onset and early propagation. An invasive diagnostic procedure, stereoelectroencephalography (SEEG) is usually implemented with frame-based methods that can be especially problematic in young children. OBJECTIVE: To evaluate the feasibility and accuracy of a new technique for frameless SEEG in children using the VarioGuide® system (Brainlab AG, München, Germany). METHODS: A frameless stereotactic navigation system was used to implant depth electrodes with percutaneous drilling and bolt insertion in pediatric patients with medically refractory epilepsy...
September 9, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28951272/intraoperative-mr-imaging-and-neuronavigation-during-resection-of-fcd-type-ii-in-adult-epilepsy-surgery-offers-better-seizure-outcome
#17
Karl Roessler, Burkhard S Kasper, Elisabeth Heynold, Roland Coras, Björn Sommer, Stefan Rampp, Hajo M Hamer, Ingmar Blümcke, Michael Buchfelder
OBJECTIVE: Focal cortical dysplasia (FCD) is one important cause of drug-resistant epilepsy potentially curable by epilepsy surgery. We investigated the options utilizing neuronavigation and intraoperative MR imaging to avoid residual epileptogenic tissue during resection of FCD II patients in order to improve seizure outcome. METHODS: Altogether 24 FCD II patients diagnosed by MR imaging (16 female, 8 males, mean age 34 ± 10 years) suffered from drug-resistant electro-clinical and focal epilepsy for mean 20...
September 23, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28933353/technical-solutions-for-simultaneous-meg-and-seeg-recordings-towards-routine-clinical-use
#18
J M Badier, A S Dubarry, M Gavaret, S Chen, A S Trébuchon, P Marquis, J Régis, F Bartolomei, C G Bénar, R Carron
OBJECTIVE: The simultaneous recording of intracerebral EEG (stereotaxic EEG, SEEG) and magnetoencephalography (MEG) is a promising strategy that provides both local and global views on brain pathological activity. Yet, acquiring simultaneous signals poses difficult technical issues that hamper their use in clinical routine. Our objective was thus to develop a set of solutions for recording a high number of SEEG channels while preserving signal quality. APPROACH: We recorded data in a patient with drug resistant epilepsy during presurgical evaluation...
September 21, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28910667/properties-of-afterdischarges-from-electrical-stimulation-in-patients-with-epilepsy
#19
Chang Liu, Tao Yu, Zhi-Wei Ren, Cui-Ping Xu, Xue-Yuan Wang, Liang Qiao, Duan-Yu Ni, Guo-Jun Zhang, Yong-Jie Li
OBJECTIVE: To investigate the properties of afterdischarges (ADs) from intracerebral electrical stimulation (ES) in patients with epilepsy who underwent stereotactic electroencephalography (SEEG) and determine the relationship between epileptogenic zone (EZ) or irritative zone (IZ) and ADs. METHODS: We retrospectively analyzed 10 patients with intractable epilepsy who underwent SEEG. ESs were delivered following the given parameters: bipolar, biphasic, 50Hz, 0.2ms pulse duration, 0...
September 7, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/28898173/utility-of-stereoelectroencephalography-in-children-with-dysembryoplastic-neuroepithelial-tumor-and-cortical-malformation
#20
Jun T Park, Guadalupe Fernandez Baca Vaca, Jennifer Avery, Jonathan P Miller
BACKGROUND: Uncontrolled seizures in children can contribute to irreversible cognitive impairment and developmental delay, in addition to placing them at risk for sudden unexplained death in epileptic patients (SUDEP). Since its introduction at Saint Ann Hospital in Paris in the 1960s, stereoelectroencephalography (SEEG) is increasingly being utilized at epilepsy centers in the United States as an invasive tool to help localize the seizure focus in drug-resistant focal epilepsy. INDICATIONS: Children with symptomatic epilepsy, commonly due to cortical dysplasia and dysembryoplastic neuroepithelial tumor (DNET), may benefit from SEEG investigation...
2017: Neurodiagnostic Journal
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