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https://www.readbyqxmd.com/read/28543030/defining-epileptogenic-networks-contribution-of-seeg-and-signal-analysis
#1
REVIEW
Fabrice Bartolomei, Stanislas Lagarde, Fabrice Wendling, Aileen McGonigal, Viktor Jirsa, Maxime Guye, Christian Bénar
Epileptogenic networks are defined by the brain regions involved in the production and propagation of epileptic activities. In this review we describe the historical, methodologic, and conceptual bases of this model in the analysis of electrophysiologic intracerebral recordings. In the context of epilepsy surgery, the determination of cerebral regions producing seizures (i.e., the "epileptogenic zone") is a crucial objective. In contrast with a traditional focal vision of focal drug-resistant epilepsies, the concept of epileptogenic networks has been progressively introduced as a model better able to describe the complexity of seizure dynamics and realistically describe the distribution of epileptogenic anomalies in the brain...
May 20, 2017: Epilepsia
https://www.readbyqxmd.com/read/28491494/the-relationship-between-morphological-lesion-magnetic-source-imaging-and-intracranial-stereo-electroencephalography-in-focal-cortical-dysplasia
#2
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/28482271/usefulness-of-stereoeeg-based-tailored-surgery-for-medial-temporal-lobe-epilepsy-preliminary-results-in-11-patients
#3
Yuichi Kubota, Taku Ochiai, Tomokatsu Hori, Takakazu Kawamata
OBJECTIVE: Surgical options for medial temporal lobe epilepsy (MTLE) include anterior temporal lobectomy (ATL) and selective amygdalohippocampectomy (SAH). Optimal criteria for choosing the appropriate surgical approach remain uncertain. This article reports 11 consecutive cases in which electrophysiological findings of stereoelectroencephalography (SEEG) were used to determine the optimal surgical approach. PATIENTS AND METHODS: Eleven consecutive patients with MTLE underwent SEEG evaluation and were placed in either the medial or the medial+lateral group based on the findings...
May 1, 2017: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/28464799/erratum-to-ipsiversive-ictal-eye-deviation-in-inferioposterior-temporal-lobe-epilepsy-two-seeg-cases-report
#4
Wei Zhang, Xingzhou Liu, Lijun Zuo, Qiang Guo, Qi Chen, Yongjun Wang
No abstract text is available yet for this article.
May 2, 2017: BMC Neurology
https://www.readbyqxmd.com/read/28463615/a-new-tool-for-touch-free-patient-registration-for-robot-assisted-intracranial-surgery-application-accuracy-from-a-phantom-study-and-a-retrospective-surgical-series
#5
Francesco Cardinale, Michele Rizzi, Piergiorgio d'Orio, Giuseppe Casaceli, Gabriele Arnulfo, Massimo Narizzano, Davide Scorza, Elena De Momi, Michele Nichelatti, Daniela Redaelli, Maurizio Sberna, Alessio Moscato, Laura Castana
OBJECTIVE The purpose of this study was to compare the accuracy of Neurolocate frameless registration system and frame-based registration for robotic stereoelectroencephalography (SEEG). METHODS The authors performed a 40-trajectory phantom laboratory study and a 127-trajectory retrospective analysis of a surgical series. The laboratory study was aimed at testing the noninferiority of the Neurolocate system. The analysis of the surgical series compared Neurolocate-based SEEG implantations with a frame-based historical control group...
May 2017: Neurosurgical Focus
https://www.readbyqxmd.com/read/28426130/length-of-stay-for-patients-undergoing-invasive-electrode-monitoring-with-stereoelectroencephalography-and-subdural-grids-correlates-positively-with-increased-institutional-profitability
#6
Alvin Y Chan, Sohayla Kharrat, Kelly Lundeen, Lilit Mnatsakanyan, Mona Sazgar, Indranil Sen-Gupta, Jack J Lin, Frank P K Hsu, Sumeet Vadera
OBJECTIVE: Lowering the length of stay (LOS) is thought to potentially decrease hospital costs and is a metric commonly used to manage capacity. Patients with epilepsy undergoing intracranial electrode monitoring may have longer LOS because the time to seizure is difficult to predict or control. This study investigates the effect of economic implications of increased LOS in patients undergoing invasive electrode monitoring for epilepsy. METHODS: We retrospectively collected and analyzed patient data for 76 patients who underwent invasive monitoring with either subdural grid (SDG) implantation or stereoelectroencephalography (SEEG) over 2 years at our institution...
April 20, 2017: Epilepsia
https://www.readbyqxmd.com/read/28419357/stereoelectroencephalography-using-magnetic-resonance-angiography-for-avascular-trajectory-planning-technical-report
#7
Krasimir Minkin, Kaloyan Gabrovski, Marin Penkov, Yuri Todorov, Rositsa Tanova, Yoana Milenova, Kiril Romansky, Petia Dimova
BACKGROUND: Stereoelectroencephalography (SEEG) requires high-quality angiographic studies because avascular trajectory planning is a prerequisite for the safety of this procedure. Some epilepsy surgery groups have begun to use computed tomography angiography and magnetic resonance T1-weighted sequence with contrast enhancement for this purpose. OBJECTIVE: To present the first series of patients with avascular trajectory planning of SEEG based on magnetic resonance angiography (MRA)...
April 13, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28386926/extratemporal-resections-in-pediatric-epilepsy-surgery-an-overview
#8
Jeffrey P Blount
Despite optimized medical treatment, approximately one third of all patients with epilepsy continue to have seizures and by definition have medically resistant epilepsy (MRE). For these patients, surgical disruption of the epileptogenic network may enable freedom or great improvement in control of their seizures. The success of surgery is dependent on accurate localization of the epileptogenic zone and network. Epilepsy arising from regions of cortical dysplasia within the neocortex of the frontal, parietal, and occipital lobes show a propensity for reorganization and progressive decline in seizure freedom and consequent poorer surgical outcome...
April 2017: Epilepsia
https://www.readbyqxmd.com/read/28386919/stereo-eeg-guided-radiofrequency-thermocoagulations
#9
Massimo Cossu, Francesco Cardinale, Giuseppe Casaceli, Laura Castana, Alessandro Consales, Piergiorgio D'Orio, Giorgio Lo Russo
The rationale and the surgical technique of stereo-electroencephalography (SEEG)-guided radiofrequency thermocoagulation (RF-TC) in the epileptogenic zone (EZ) of patients with difficult-to-treat focal epilepsy are described in this article. The application of the technique in pediatric patients is also detailed. Stereotactic ablative procedures by RF-TC have been employed in the treatment of epilepsy since the middle of the last century. This treatment option has gained new popularity in recent decades, mainly because of the availability of modern imaging techniques, which allow accurate targeting of intracerebral epileptogenic structures...
April 2017: Epilepsia
https://www.readbyqxmd.com/read/28324680/somatic-complications-of-epilepsy-surgery-over-25-years-at-a-single-center
#10
Inuka K Gooneratne, Shahidul Mannan, Jane de Tisi, Juan C Gonzalez, Andrew W McEvoy, Anna Miserocchi, Beate Diehl, Tim Wehner, Gail S Bell, Josemir W Sander, John S Duncan
INTRODUCTION: Epilepsy surgery is an effective treatment for refractory focal epilepsy. Risks of surgery need to be considered when advising individuals of treatment options. We describe the frequency and nature of physical adverse events associated with epilepsy surgery in a single center. MATERIAL AND METHODS: We reviewed the prospectively maintained records of adults who underwent epilepsy surgery at our center between 1990 and 2014 to identify peri/postsurgical adverse events...
March 1, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/28323161/seeg-dipole-source-localization-based-on-an-empirical-bayesian-approach-taking-into-account-forward-model-uncertainties
#11
S Le Cam, R Ranta, V Caune, G Korats, L Koessler, L Maillard, V Louis-Dorr
Electromagnetic brain source localization consists in the inversion of a forward model based on a limited number of potential measurements. A wide range of methods has been developed to regularize this severely ill-posed problem and to reduce the solution space, imposing spatial smoothness, anatomical constraint or sparsity of the activated source map. This last criteria, based on physiological assumptions stating that in some particular events (e.g., epileptic spikes, evoked potential) few focal area of the brain are simultaneously actives, has gained more and more interest...
March 18, 2017: NeuroImage
https://www.readbyqxmd.com/read/28294306/the-hemodynamic-response-to-interictal-epileptic-discharges-localizes-the-seizure-onset-zone
#12
Hui Ming Khoo, Yongfu Hao, Nicolás von Ellenrieder, Natalja Zazubovits, Jeffery Hall, André Olivier, François Dubeau, Jean Gotman
OBJECTIVE: Intracranial electroencephalography (EEG), performed presurgically in patients with drug-resistant and difficult-to-localize focal epilepsy, samples only a small fraction of brain tissue and thus requires strong hypotheses regarding the possible localization of the epileptogenic zone. EEG/fMRI (functional magnetic resonance imaging), a noninvasive tool resulting in hemodynamic responses, could contribute to the generation of these hypotheses. This study assessed how these responses, despite their interictal origin, predict the seizure-onset zone (SOZ)...
March 15, 2017: Epilepsia
https://www.readbyqxmd.com/read/28281494/role-of-magnetoencephalography-and-stereo-electroencephalography-in-the-presurgical-evaluation-in-patients-with-drug-resistant-epilepsy
#13
REVIEW
V Jayabal, Ashok Pillai, S Sinha, N Mariyappa, P Satishchandra, S Gopinath, Kurupath Radhakrishnan
In selected patients with drug-resistant focal epilepsies (DRFE), who otherwise are likely to be excluded from epilepsy surgery (ES) because of the absence of a magnetic resonance imaging (MRI)-demonstrable lesion or discordant anatomo-electro-clinical (AEC) data, magnetoencephalography (MEG) may help to generate an AEC hypothesis and stereo-electroencephalography (SEEG) may help to verify the hypothesis and proceed with ES. The sensitivity of MEG is much better in localizing the spiking zone in relation to lateral temporal and extratemporal cortical regions compared to the mesial temporal structures...
2017: Neurology India
https://www.readbyqxmd.com/read/28261785/accuracy-of-intracranial-electrode-placement-for-stereoencephalography-a-systematic-review-and-meta-analysis
#14
REVIEW
Vejay N Vakharia, Rachel Sparks, Aidan G O'Keeffe, Roman Rodionov, Anna Miserocchi, Andrew McEvoy, Sebastien Ourselin, John Duncan
OBJECTIVE: Stereoencephalography (SEEG) is a procedure in which electrodes are inserted into the brain to help define the epileptogenic zone. This is performed prior to definitive epilepsy surgery in patients with drug-resistant focal epilepsy when noninvasive data are inconclusive. The main risk of the procedure is hemorrhage, which occurs in 1-2% of patients. This may result from inaccurate electrode placement or a planned electrode damaging a blood vessel that was not detected on the preoperative vascular imaging...
March 6, 2017: Epilepsia
https://www.readbyqxmd.com/read/28222686/ipsiversive-ictal-eye-deviation-in-inferioposterior-temporal-lobe-epilepsy-two-seeg-cases-report
#15
Wei Zhang, Xingzhou Liu, Lijun Zuo, Qiang Guo, Qi Chen, Yongjun Wang
BACKGROUND: Versive seizure characterized by conjugate eye movement during epileptic seizure has been considered commonly as one of the most valuable semiological signs for epilepsy localization, especially for frontal lobe epilepsy. However, thelateralizing and localizing significance of ictaleye deviation has been questioned by clinical observation of a series of focal epilepsy studies, including frontal, central, temporal, parietal and occipital epilepsy. CASE PRESENTATION: Two epileptic cases characterized by ipsiversive eye deviation as initial clinical sign during the habitual epileptic seizures are presented in this paper...
February 21, 2017: BMC Neurology
https://www.readbyqxmd.com/read/28150296/radiofrequency-thermocoagulation-of-the-seizure-onset-zone-during-stereoelectroencephalography
#16
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...
March 2017: Epilepsia
https://www.readbyqxmd.com/read/28104438/safety-of-externally-stimulated-intracranial-electrodes-during-functional-mri-at-1-5t
#17
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
#18
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
#19
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...
March 1, 2017: JAMA Neurology
https://www.readbyqxmd.com/read/28088805/a-retrospective-analysis-of-stereoelectroencephalography-and-subdural-electroencephalography-for-preoperative-evaluation-of-intractable-epilepsy
#20
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...
2017: Stereotactic and Functional Neurosurgery
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