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Liu PC, Chen HH, Chou CC, Chen CJ, Chen YH, Lin CF, Chen C, Yu HY, Lee CC. Stereo-EEG for Epileptogenic Focus Localization in Schizencephaly: A Single-center Experience in Four Patients. World Neurosurg 2023; 172:e319-e325. [PMID: 36632895 DOI: 10.1016/j.wneu.2023.01.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Revised: 01/04/2023] [Accepted: 01/05/2023] [Indexed: 01/11/2023]
Abstract
OBJECTIVE Schizencephaly is a congenital cerebral malformation characterized by clefts in the hemispheres of the brain, where variations in semiology often make it difficult to localize epileptogenic focus. Here, we report on a series of patients who underwent stereo-encephalography (SEEG) for epileptogenic focus localization and subsequent SEEG-guided surgical intervention. METHODS Four patients (ages 27, 33, 27, 25 years) with a mean seizure history of 16 years (range 8-22 years) were analyzed. Data pertaining to semiology, video encephalography (EEG), magnetic resonance imaging, positron emission tomography, and invasive EEG studies, surgical intervention and post-surgery outcome were collected and analyzed. RESULTS All seizure onset zones were within the extent of schizencephaly; however, the limbic system (including the hippocampus, amygdala, cingulate gyrus, or insula) was involved in early spreading. Two patients underwent SEEG-guided radiofrequency thermo-ablation (RFTA) in the seizure onset zone, 1 patient underwent lesionectomy via craniotomy, and 1 underwent neither RFTA nor lesionectomy. At 2 years post-surgery, the outcomes were as follows: Engel grade Ia (n = 2), Ib (n = 1), and III (n = 1). CONCLUSIONS This article reports on a precise approach to treating patients with schizencephaly dependent of seizure onset zone and functional cortex mapping. Subsequent SEEG-guided surgical interventions (radiofrequency thermo-ablation and lesionectomy) were shown to reduce seizure frequency, while preserving the neurologic functions in drug-resistant epilepsy patients with schizencephaly.
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Affiliation(s)
- Ping-Chuan Liu
- Department of Neurosurgery, Neurological Institute, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Hsin-Hung Chen
- Department of Neurosurgery, Neurological Institute, Taipei Veterans General Hospital, Taipei, Taiwan; School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
| | - Chien-Chen Chou
- Department of Neurology, Neurological Institute, Taipei Veterans General Hospital, Taipei, Taiwan; School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan; Brain Research Center, National Yang Ming Chiao Tung University, Taipei, Taiwan
| | - Ching-Jen Chen
- Department of Neurosurgery, The University of Texas Health Science Center, Houston, Texas, USA
| | - Yi-Hsiu Chen
- Department of Neurosurgery, Neurological Institute, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Chun-Fu Lin
- Department of Neurosurgery, Neurological Institute, Taipei Veterans General Hospital, Taipei, Taiwan; School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
| | - Chien Chen
- Department of Neurology, Neurological Institute, Taipei Veterans General Hospital, Taipei, Taiwan; School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan; Brain Research Center, National Yang Ming Chiao Tung University, Taipei, Taiwan
| | - Hsiang-Yu Yu
- Department of Neurology, Neurological Institute, Taipei Veterans General Hospital, Taipei, Taiwan; School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan; Brain Research Center, National Yang Ming Chiao Tung University, Taipei, Taiwan
| | - Cheng-Chia Lee
- Department of Neurosurgery, Neurological Institute, Taipei Veterans General Hospital, Taipei, Taiwan; School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan; Brain Research Center, National Yang Ming Chiao Tung University, Taipei, Taiwan.
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2
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Scholl T, Gruber VE, Samueli S, Lehner R, Kasprian G, Czech T, Reinten RJ, Hoogendijk L, Hainfellner JA, Aronica E, Mühlebner A, Feucht M. Neurite Outgrowth Inhibitor (NogoA) Is Upregulated in White Matter Lesions of Complex Cortical Malformations. J Neuropathol Exp Neurol 2021; 80:274-282. [PMID: 33517425 DOI: 10.1093/jnen/nlaa159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Complex cortical malformations (CCMs), such as hemimegalencephaly and polymicrogyria, are associated with drug-resistant epilepsy and developmental impairment. They share certain neuropathological characteristics including mammalian target of rapamycin (mTOR) activation and an atypical number of white matter neurons. To get a better understanding of the pathobiology of the lesion architecture, we investigated the role of neurite outgrowth inhibitor A (NogoA), a known regulator of neuronal migration. Epilepsy surgery specimens from 16 CCM patients were analyzed and compared with sections of focal cortical dysplasia IIB (FCD IIB, n = 22), tuberous sclerosis complex (TSC, n = 8) as well as healthy controls (n = 15). Immunohistochemistry was used to characterize NogoA, myelination, and mTOR signaling. Digital slides were evaluated automatically with ImageJ. NogoA staining showed a significantly higher expression within the white matter of CCM and FCD IIB, whereas cortical tubers presented levels similar to controls. Further analysis of possible associations of NogoA with other factors revealed a positive correlation with mTOR and seizure frequency. To identify the main expressing NogoA cell type, double staining revealed dysmorphic neuronal white matter cells. Increased NogoA expression is associated with profound inhibition of neuritic sprouting and therefore contributes to a decrease in neuronal network complexity in CCM patients.
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Affiliation(s)
- Theresa Scholl
- From the Department of Pediatrics and Adolescent Medicine, Medical University of Vienna, Vienna, Austria
| | - Victoria-Elisabeth Gruber
- From the Department of Pediatrics and Adolescent Medicine, Medical University of Vienna, Vienna, Austria
| | - Sharon Samueli
- From the Department of Pediatrics and Adolescent Medicine, Medical University of Vienna, Vienna, Austria
| | - Reinhard Lehner
- Institute of Medical Genetics, Medical University of Vienna, Vienna, Austria
| | - Gregor Kasprian
- Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria
| | - Thomas Czech
- Department of Neurosurgery, Medical University of Vienna, Vienna, Austria
| | - Roy J Reinten
- Department of Neuropathology, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
| | - Lisette Hoogendijk
- Department of Neuropathology, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
| | - Johannes A Hainfellner
- Division of Neuropathology and Neurochemistry, Department of Neurology, Medical University of Vienna, Vienna, Austria
| | - Eleonora Aronica
- Department of Neuropathology, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands.,Stichting Epilepsie Instellingen Nederland (SEIN), Zwolle, The Netherlands
| | - Angelika Mühlebner
- Department of Neuropathology, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
| | - Martha Feucht
- From the Department of Pediatrics and Adolescent Medicine, Medical University of Vienna, Vienna, Austria
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3
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Asadzadeh S, Yousefi Rezaii T, Beheshti S, Delpak A, Meshgini S. A systematic review of EEG source localization techniques and their applications on diagnosis of brain abnormalities. J Neurosci Methods 2020; 339:108740. [DOI: 10.1016/j.jneumeth.2020.108740] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 04/13/2020] [Accepted: 04/13/2020] [Indexed: 12/12/2022]
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4
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Rikir E, Maillard LG, Abdallah C, Gavaret M, Bartolomei F, Vignal JP, Colnat-Coulbois S, Koessler L. Respective Contribution of Ictal and Inter-ictal Electrical Source Imaging to Epileptogenic Zone Localization. Brain Topogr 2020; 33:384-402. [DOI: 10.1007/s10548-020-00768-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Accepted: 04/07/2020] [Indexed: 10/24/2022]
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5
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Alhilani M, Tamilia E, Ricci L, Ricci L, Grant PE, Madsen JR, Pearl PL, Papadelis C. Ictal and interictal source imaging on intracranial EEG predicts epilepsy surgery outcome in children with focal cortical dysplasia. Clin Neurophysiol 2020; 131:734-743. [PMID: 32007920 DOI: 10.1016/j.clinph.2019.12.408] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Revised: 11/12/2019] [Accepted: 12/04/2019] [Indexed: 01/10/2023]
Abstract
OBJECTIVE To localize the seizure onset zone (SOZ) and irritative zone (IZ) using electric source imaging (ESI) on intracranial EEG (iEEG) and assess their clinical value in predicting epilepsy surgery outcome in children with focal cortical dysplasia (FCD). METHODS We analyzed iEEG data from 25 children with FCD-associated medically refractory epilepsy (MRE) who underwent surgery. We performed ESI on ictal onset to localize SOZ (ESI-SOZ) and on interictal discharges to localize IZ (ESI-IZ). We tested whether resection of ESI-SOZ and ESI-IZ predicted good surgical outcome (Engel 1). We further compared the prediction performance of ESI-SOZ and ESI-IZ to those of SOZ and IZ defined using conventional methods, i.e. by identifying iEEG-contacts showing ictal onsets (conventional-SOZ) or being the most interictally active (conventional-IZ). RESULTS The proximity of ESI-SOZ (p = 0.043, odds-ratio = 3.9) and ESI-IZ (p = 0.011, odds-ratio = 7.04) to resection has higher effect on patients' outcome than proximity of conventional-SOZ (p = 0.17, odds-ratio = 1.7) and conventional-IZ (p = 0.038, odds-ratio = 2.6). Resection of ESI-SOZ and ESI-IZ presented higher discriminative power in predicting outcome (68% and 60%) than conventional-SOZ and conventional-IZ (48% and 53%). CONCLUSIONS Localizing SOZ and IZ via ESI on iEEG offers higher predictive value compared to conventional-iEEG interpretation. SIGNIFICANCE iEEG-ESI may help surgical planning and facilitate prognostic assessment of children with FCD-associated MRE.
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Affiliation(s)
- Michel Alhilani
- Laboratory of Children's Brain Dynamics, Division of Newborn Medicine, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA; Fetal-Neonatal Neuroimaging Developmental Science Center, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA; The Hillingdon Hospital NHS Foundation Trust, London, UK
| | - Eleonora Tamilia
- Laboratory of Children's Brain Dynamics, Division of Newborn Medicine, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA; Fetal-Neonatal Neuroimaging Developmental Science Center, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA
| | - Lorenzo Ricci
- Laboratory of Children's Brain Dynamics, Division of Newborn Medicine, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA; Unit of Neurology, Neurophysiology, Neurobiology, Department of Medicine, University Campus Bio-Medico of Rome, Rome, Italy
| | - Laura Ricci
- Laboratory of Children's Brain Dynamics, Division of Newborn Medicine, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA; Fetal-Neonatal Neuroimaging Developmental Science Center, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA
| | - P Ellen Grant
- Fetal-Neonatal Neuroimaging Developmental Science Center, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA
| | - Joseph R Madsen
- Division of Epilepsy Surgery, Department of Neurosurgery, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA
| | - Phillip L Pearl
- Division of Epilepsy and Clinical Neurophysiology, Department of Neurology, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA
| | - Christos Papadelis
- Laboratory of Children's Brain Dynamics, Division of Newborn Medicine, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA; Fetal-Neonatal Neuroimaging Developmental Science Center, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA; Jane and John Justin Neurosciences Center, Cook Children's Health Care System, Fort Worth, TX, USA; Department of Bioengineering, University of Texas at Arlington, Arlington, TX, USA.
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6
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Liu Y, Zhou W, Hong B, Zhao T, Xu C, Ruan J, Bai J, Wang S. Multiple Stereoelectroencephalography-Guided Radiofrequency Thermocoagulations for Polymicrogyria With Startle Seizures: A Case Report. Front Neurol 2019; 10:1095. [PMID: 31681156 PMCID: PMC6813566 DOI: 10.3389/fneur.2019.01095] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Accepted: 09/30/2019] [Indexed: 01/01/2023] Open
Abstract
The best results of stereoelectroencephalography (SEEG)-guided radiofrequency thermocoagulation (RF-TC) were observed in epilepsies with more limited lesions, but this procedure is rarely used in a wide range of brain malformation. We report a rare case of polymicrogyria (PMG) combined with drug-resistant startle seizures. Presurgical monitoring was performed using SEEG owing to the large lesion and complexity of PMG. According to the intracranial electrode results, the seizure onset was extensive, with the onset starting earlier in the cingulate sulcus and insular pole than in other sites of the other electrodes. Multi-point and multi-step SEEG-guided RF-TC was used for diffuse lesion and functional protection. RF-TC was first applied to the cingulate sulcus and insular pole, and our patient was rendered free from startle seizures after 2 weeks. Two weeks of observation helped us to observe the efficacy of RF-TC and the changes of SEEG, so as to make the next TC scheme. The patient still had spontaneous seizures after the first treatment. RF-TC was then applied to other sites involved earlier. Finally, the patient reached Engel class IIa for a follow-up period of 1 year. There were no additional startle seizures, and important functional areas were protected.
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Affiliation(s)
- Yi'Ou Liu
- Tsinghua University Yuquan Hospital, Beijing, China
| | - Wenjing Zhou
- Tsinghua University Yuquan Hospital, Beijing, China
| | - Bo Hong
- Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, China
| | - Tong Zhao
- Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, China
| | - Chengwei Xu
- Inner Mongolia People's Hospital, Inner Mongolia Autonomous Region, Hohhot, China
| | - Jing Ruan
- Tsinghua University Yuquan Hospital, Beijing, China
| | - Jianjun Bai
- Tsinghua University Yuquan Hospital, Beijing, China
| | - Siyu Wang
- Tsinghua University Yuquan Hospital, Beijing, China
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7
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Malformazioni dello sviluppo corticale. Neurologia 2019. [DOI: 10.1016/s1634-7072(19)42019-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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8
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Abramovici S, Antony A, Baldwin ME, Urban A, Ghearing G, Pan J, Sun T, Krafty RT, Richardson RM, Bagic A. Features of Simultaneous Scalp and Intracranial EEG That Predict Localization of Ictal Onset Zone. Clin EEG Neurosci 2018; 49:206-212. [PMID: 29067832 DOI: 10.1177/1550059417738688] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
OBJECTIVE To assess the utility of simultaneous scalp EEG in patients with focal epilepsy undergoing intracranial EEG evaluation after a detailed presurgical testing, including an inpatient scalp video EEG evaluation. METHODS Patients who underwent simultaneous scalp and intracranial EEG (SSIEEG) monitoring were classified into group 1 or 2 depending on whether the seizure onset zone was delineated or not. Seizures were analyzed using the following 3 EEG features at the onset of seizures latency, location, and pattern. RESULTS The criteria showed at least one of the following features when comparing SSIEEG: prolonged latency, absence of anatomical congruence, lack of concordance of EEG pattern in 11.11% (1/9) of the patients in group 1 and 75 % (3/4) of the patients in group 2. These 3 features were not present in any of the 5 patients who had Engel class I outcome compared with 1 of the 2 patients (50%) who had seizure recurrence after resective surgery. The mean latency of seizure onset in scalp EEG compared with intracranial EEG of patients in group 1 was 17.48 seconds (SD = 16.07) compared with 4.33 seconds (SD = 11.24) in group 2 ( P = .03). None of the seizures recorded in patients in group 1 had a discordant EEG pattern in SSIEEG. CONCLUSION Concordance in EEG features like latency, location, and EEG pattern, at the onset of seizures in SSIEEG is associated with a favorable outcome after epilepsy surgery in patients with intractable focal epilepsy. SIGNIFICANCE Simultaneous scalp EEG complements intracranial EEG evaluation even after a detailed inpatient scalp video EEG evaluation and could be part of standard intracranial EEG studies in patients with intractable focal epilepsy.
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Affiliation(s)
| | - Arun Antony
- 2 University of Pittsburgh Comprehensive Epilepsy Center (UPCEC), University of Pittsburgh Medical Center, Pittsburgh, PA, USA
| | - Maria Elizabeth Baldwin
- 2 University of Pittsburgh Comprehensive Epilepsy Center (UPCEC), University of Pittsburgh Medical Center, Pittsburgh, PA, USA
| | - Alexandra Urban
- 2 University of Pittsburgh Comprehensive Epilepsy Center (UPCEC), University of Pittsburgh Medical Center, Pittsburgh, PA, USA
| | - Gena Ghearing
- 2 University of Pittsburgh Comprehensive Epilepsy Center (UPCEC), University of Pittsburgh Medical Center, Pittsburgh, PA, USA
| | - Julie Pan
- 2 University of Pittsburgh Comprehensive Epilepsy Center (UPCEC), University of Pittsburgh Medical Center, Pittsburgh, PA, USA
| | - Tao Sun
- 3 Department of Biostatistics, University of Pittsburgh, Pittsburgh, PA, USA
| | - Robert Todd Krafty
- 3 Department of Biostatistics, University of Pittsburgh, Pittsburgh, PA, USA
| | - R Mark Richardson
- 4 Department of Neurosurgery, University of Pittsburgh Medical Center, UPMC Presbyterian, Pittsburgh, PA, USA
| | - Anto Bagic
- 2 University of Pittsburgh Comprehensive Epilepsy Center (UPCEC), University of Pittsburgh Medical Center, Pittsburgh, PA, USA
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9
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Rossion B, Jacques C, Jonas J. Mapping face categorization in the human ventral occipitotemporal cortex with direct neural intracranial recordings. Ann N Y Acad Sci 2018; 1426:5-24. [PMID: 29479704 DOI: 10.1111/nyas.13596] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2017] [Revised: 12/07/2017] [Accepted: 12/14/2017] [Indexed: 11/29/2022]
Abstract
The neural basis of face categorization has been widely investigated with functional magnetic resonance imaging (fMRI), identifying a set of face-selective local regions in the ventral occipitotemporal cortex (VOTC). However, indirect recording of neural activity with fMRI is associated with large fluctuations of signal across regions, often underestimating face-selective responses in the anterior VOTC. While direct recording of neural activity with subdural grids of electrodes (electrocorticography, ECoG) or depth electrodes (stereotactic electroencephalography, SEEG) offers a unique opportunity to fill this gap in knowledge, these studies rather reveal widely distributed face-selective responses. Moreover, intracranial recordings are complicated by interindividual variability in neuroanatomy, ambiguity in definition, and quantification of responses of interest, as well as limited access to sulci with ECoG. Here, we propose to combine SEEG in large samples of individuals with fast periodic visual stimulation to objectively define, quantify, and characterize face categorization across the whole VOTC. This approach reconciles the wide distribution of neural face categorization responses with their (right) hemispheric and regional specialization, and reveals several face-selective regions in anterior VOTC sulci. We outline the challenges of this research program to understand the neural basis of face categorization and high-level visual recognition in general.
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Affiliation(s)
- Bruno Rossion
- Psychological Sciences Research Institute, Institute of Neuroscience, University of Louvain (UCLouvain), Louvain-la-Neuve, Belgium
- Service de Neurologie, Centre Hospitalier Régional Universitaire (CHRU) de Nancy, Nancy, France
- CRAN, UMR 7039, CNRS et Université de Lorraine, Nancy, France
| | - Corentin Jacques
- Psychological Sciences Research Institute, Institute of Neuroscience, University of Louvain (UCLouvain), Louvain-la-Neuve, Belgium
- Research Group Psychiatry, Department of Neuroscience, University of Leuven, Leuven, Belgium
| | - Jacques Jonas
- Psychological Sciences Research Institute, Institute of Neuroscience, University of Louvain (UCLouvain), Louvain-la-Neuve, Belgium
- Service de Neurologie, Centre Hospitalier Régional Universitaire (CHRU) de Nancy, Nancy, France
- CRAN, UMR 7039, CNRS et Université de Lorraine, Nancy, France
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10
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Chassoux F, Navarro V, Catenoix H, Valton L, Vignal JP. Planning and management of SEEG. Neurophysiol Clin 2018; 48:25-37. [DOI: 10.1016/j.neucli.2017.11.007] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
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11
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Minotti L, Montavont A, Scholly J, Tyvaert L, Taussig D. Indications and limits of stereoelectroencephalography (SEEG). Neurophysiol Clin 2018; 48:15-24. [DOI: 10.1016/j.neucli.2017.11.006] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
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12
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Verger A, Lagarde S, Maillard L, Bartolomei F, Guedj E. Brain molecular imaging in pharmacoresistant focal epilepsy: Current practice and perspectives. Rev Neurol (Paris) 2018; 174:16-27. [DOI: 10.1016/j.neurol.2017.05.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2016] [Accepted: 05/11/2017] [Indexed: 10/19/2022]
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13
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Abdallah C, Maillard LG, Rikir E, Jonas J, Thiriaux A, Gavaret M, Bartolomei F, Colnat-Coulbois S, Vignal JP, Koessler L. Localizing value of electrical source imaging: Frontal lobe, malformations of cortical development and negative MRI related epilepsies are the best candidates. NEUROIMAGE-CLINICAL 2017; 16:319-329. [PMID: 28856095 PMCID: PMC5565782 DOI: 10.1016/j.nicl.2017.08.009] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/12/2016] [Revised: 07/24/2017] [Accepted: 08/07/2017] [Indexed: 11/29/2022]
Abstract
OBJECTIVE We aimed to prospectively assess the anatomical concordance of electric source localizations of interictal discharges with the epileptogenic zone (EZ) estimated by stereo-electroencephalography (SEEG) according to different subgroups: the type of epilepsy, the presence of a structural MRI lesion, the aetiology and the depth of the EZ. METHODS In a prospective multicentric observational study, we enrolled 85 consecutive patients undergoing pre-surgical SEEG investigation for focal drug-resistant epilepsy. Electric source imaging (ESI) was performed before SEEG. Source localizations were obtained from dipolar and distributed source methods. Anatomical concordance between ESI and EZ was defined according to 36 predefined sublobar regions. ESI was interpreted blinded to- and subsequently compared with SEEG estimated EZ. RESULTS 74 patients were finally analyzed. 38 patients had temporal and 36 extra-temporal lobe epilepsy. MRI was positive in 52. 41 patients had malformation of cortical development (MCD), 33 had another or an unknown aetiology. EZ was medial in 27, lateral in 13, and medio-lateral in 34. In the overall cohort, ESI completely or partly localized the EZ in 85%: full concordance in 13 cases and partial concordance in 50 cases. The rate of ESI full concordance with EZ was significantly higher in (i) frontal lobe epilepsy (46%; p = 0.05), (ii) cases of negative MRI (36%; p = 0.01) and (iii) MCD (27%; p = 0.03). The rate of ESI full concordance with EZ was not statistically different according to the depth of the EZ. SIGNIFICANCE We prospectively demonstrated that ESI more accurately estimated the EZ in subgroups of patients who are often the most difficult cases in epilepsy surgery: frontal lobe epilepsy, negative MRI and the presence of MCD.
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Affiliation(s)
- Chifaou Abdallah
- Neurology Department, University Hospital of Nancy, Nancy, France
| | - Louis G Maillard
- Neurology Department, University Hospital of Nancy, Nancy, France.,CRAN, UMR 7039, Lorraine University, Vandœuvre-les-Nancy Cedex, France.,CNRS, CRAN, UMR 7039, Vandœuvre-les-Nancy Cedex, France.,Medical Faculty, Lorraine University, Nancy, France
| | - Estelle Rikir
- Neurology Department, University Hospital of Sart-Tilman, Liege, Belgium.,Medical Faculty, Liege University, Liege, Belgium
| | - Jacques Jonas
- Neurology Department, University Hospital of Nancy, Nancy, France.,CRAN, UMR 7039, Lorraine University, Vandœuvre-les-Nancy Cedex, France.,CNRS, CRAN, UMR 7039, Vandœuvre-les-Nancy Cedex, France
| | - Anne Thiriaux
- Neurology department, University Hospital of Reims, Reims, France
| | - Martine Gavaret
- Clinical Neurophysiology Department, AP-HM, University Hospital la Timone, Marseille, France.,INSERM UMR 1106, Institut de Neurosciences des Systemes, Marseille, France.,Medical Faculty, Aix-Marseille University, Marseille, France
| | - Fabrice Bartolomei
- Clinical Neurophysiology Department, AP-HM, University Hospital la Timone, Marseille, France.,INSERM UMR 1106, Institut de Neurosciences des Systemes, Marseille, France.,Medical Faculty, Aix-Marseille University, Marseille, France
| | - Sophie Colnat-Coulbois
- Medical Faculty, Lorraine University, Nancy, France.,Neurosurgery Department, University Hospital of Nancy, Nancy, France
| | - Jean-Pierre Vignal
- Neurology Department, University Hospital of Nancy, Nancy, France.,CRAN, UMR 7039, Lorraine University, Vandœuvre-les-Nancy Cedex, France.,CNRS, CRAN, UMR 7039, Vandœuvre-les-Nancy Cedex, France
| | - Laurent Koessler
- Neurology Department, University Hospital of Nancy, Nancy, France.,CRAN, UMR 7039, Lorraine University, Vandœuvre-les-Nancy Cedex, France.,CNRS, CRAN, UMR 7039, Vandœuvre-les-Nancy Cedex, France
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14
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Koessler L, Colnat-Coulbois S, Cecchin T, Hofmanis J, Dmochowski JP, Norcia AM, Maillard LG. In-vivo measurements of human brain tissue conductivity using focal electrical current injection through intracerebral multicontact electrodes. Hum Brain Mapp 2016; 38:974-986. [PMID: 27726249 DOI: 10.1002/hbm.23431] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2016] [Revised: 09/23/2016] [Accepted: 09/30/2016] [Indexed: 11/08/2022] Open
Abstract
In-vivo measurements of human brain tissue conductivity at body temperature were conducted using focal electrical currents injected through intracerebral multicontact electrodes. A total of 1,421 measurements in 15 epileptic patients (age: 28 ± 10) using a radiofrequency generator (50 kHz current injection) were analyzed. Each contact pair was classified as being from healthy (gray matter, n = 696; white matter, n = 530) or pathological (epileptogenic zone, n = 195) tissue using neuroimaging analysis of the local tissue environment and intracerebral EEG recordings. Brain tissue conductivities were obtained using numerical simulations based on conductivity estimates that accounted for the current flow in the local brain volume around the contact pairs (a cube with a side length of 13 mm). Conductivity values were 0.26 S/m for gray matter and 0.17 S/m for white matter. Healthy gray and white matter had statistically different median impedances (P < 0.0001). White matter conductivity was found to be homogeneous as normality tests did not find evidence of multiple subgroups. Gray matter had lower conductivity in healthy tissue than in the epileptogenic zone (0.26 vs. 0.29 S/m; P = 0.012), even when the epileptogenic zone was not visible in the magnetic resonance image (MRI) (P = 0.005). The present in-vivo conductivity values could serve to create more accurate volume conduction models and could help to refine the identification of relevant intracerebral contacts, especially when located within the epileptogenic zone of an MRI-invisible lesion. Hum Brain Mapp 38:974-986, 2017. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Laurent Koessler
- CNRS, CRAN, UMR 7039, Vandœuvre-lès-Nancy, France.,Université de Lorraine, CRAN, UMR 7039, Vandœuvre-lès-Nancy, 54516, France.,Service de Neurologie, Centre Hospitalier Universitaire de Nancy, Nancy, 54000, France
| | - Sophie Colnat-Coulbois
- Service de Neurochirurgie, Centre Hospitalier Universitaire de Nancy, Nancy, 54000, France
| | - Thierry Cecchin
- CNRS, CRAN, UMR 7039, Vandœuvre-lès-Nancy, France.,Université de Lorraine, CRAN, UMR 7039, Vandœuvre-lès-Nancy, 54516, France
| | - Janis Hofmanis
- Ventspils Engineering Research Institute, Ventspils University, Ventspils, LV3601, Latvia
| | - Jacek P Dmochowski
- Department of Biomedical Engineering, City College of New York, New York, New York
| | - Anthony M Norcia
- Department of Psychology, Stanford University, Stanford, California
| | - Louis G Maillard
- CNRS, CRAN, UMR 7039, Vandœuvre-lès-Nancy, France.,Université de Lorraine, CRAN, UMR 7039, Vandœuvre-lès-Nancy, 54516, France.,Service de Neurologie, Centre Hospitalier Universitaire de Nancy, Nancy, 54000, France
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15
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Yang XY, Long LL, Xiao B. [Role of video electroencephalogram in diagnosis and localization of epilepsy in children]. ZHONGGUO DANG DAI ER KE ZA ZHI = CHINESE JOURNAL OF CONTEMPORARY PEDIATRICS 2016; 18:971-974. [PMID: 27751213 PMCID: PMC7389555 DOI: 10.7499/j.issn.1008-8830.2016.10.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 04/16/2016] [Accepted: 05/20/2016] [Indexed: 06/06/2023]
Abstract
OBJECTIVE To study the role of video electroencephalogram (VEEG) versus regular electroencephalogram (REEG) in the diagnosis of epilepsy and localization of origin of epileptic discharge in children through a comparative analysis. METHODS A retrospective analysis was performed for the clinical data of 223 children with clinical paroxysmal symptoms in the past and suspected epilepsy. VEEG and REEG were compared from the aspects of monitoring of clinical seizures, interictal epileptiform discharge (IED), localization of the origin of IED, and identification of non-epileptic seizures, and the detection rate of IED during awakening and sleep stages was also compared. RESULTS Compared with REEG, VEEG had significantly higher detection rates of IED and synchronous clinical seizures in children with epileptiform discharge (P<0.01). Of all children, 86 were diagnosed with epilepsy, 78 were diagnosed with epilepsy syndrome, 31 were diagnosed with non-epileptic seizures, and 81 had a definite location of the origin of epileptic discharge according to the VEEG. The detection rate of IED in the sleep stage was higher than that in the awakening stage (46% vs 13.2%; P<0.01), and IED was mainly detected in the NREM I-II stages according to the VEEG. CONCLUSIONS VEEG has a significantly better performance than REEG in the diagnosis and localization of epilepsy in children and has a high value in clinical practice.
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Affiliation(s)
- Xiao-Yan Yang
- Department of Neurology, Xiangya Hospital, Central South University, Changsha 410008, China.
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16
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Wang DD, Knox R, Rolston JD, Englot DJ, Barkovich AJ, Tihan T, Auguste KI, Knowlton RC, Cornes SB, Chang EF. Surgical management of medically refractory epilepsy in patients with polymicrogyria. Epilepsia 2015; 57:151-61. [PMID: 26647903 DOI: 10.1111/epi.13264] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/30/2015] [Indexed: 12/31/2022]
Abstract
OBJECTIVE Polymicrogyria (PMG) is a malformation of cortical development characterized by formation of an excessive number of small gyri. Sixty percent to 85% of patients with PMG have epilepsy that is refractory to medication, but surgical options are usually limited. We characterize a cohort of patient with polymicrogyria who underwent epilepsy surgery and document seizure outcomes. METHODS A retrospective study of all patients with PMG who underwent epilepsy surgery (focal seizure foci resection and/or hemispherectomy) at our center was performed by review of all clinical data related to their treatment. RESULTS We identified 12 patients (7 males and 5 female) with mean age of 18 (ranging from 3 months to 44 years) at time of surgery. Mean age at seizure onset was 8 years, with the majority (83%) having childhood onset. Six patients had focal, five had multifocal, and one patient had diffuse PMG. Perisylvian PMG was the most common pattern seen on magnetic resonance imaging (MRI). Eight patients had other cortical malformations including hemimegalencephaly and cortical dysplasia. Scalp electroencephalography (EEG) often showed diffuse epileptic discharges that poorly lateralized but were focal on intracranial electrocorticography (ECoG). Eight patients underwent seizure foci resection and four underwent hemispherectomy. Mean follow-up was 7 years (ranging from one to 19 years). Six patients (50%) were seizure-free at last follow-up. One patient had rare seizures (Engel class II). Three patients were Engel class III, having either decreased seizure frequency or severity, and two patients were Engel class IV. Gross total resection of the PMG cortex trended toward good seizure control. SIGNIFICANCE Our study shows that even in patients with extensive or bilateral PMG malformations, some may still be good candidates for surgery because the epileptogenic zone may involve only a portion of the malformation. Intracranial ECoG can provide additional localizing information compared to scalp EEG in guiding resection of epileptogenic foci.
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Affiliation(s)
- Doris D Wang
- Department of Neurological Surgery, UCSF Comprehensive Epilepsy Center, University of California, San Francisco, California, U.S.A
| | - Renatta Knox
- Department of Neurology, University of California, San Francisco, California, U.S.A
| | - John D Rolston
- Department of Neurological Surgery, UCSF Comprehensive Epilepsy Center, University of California, San Francisco, California, U.S.A
| | - Dario J Englot
- Department of Neurological Surgery, UCSF Comprehensive Epilepsy Center, University of California, San Francisco, California, U.S.A
| | - A James Barkovich
- Department of Radiology, University of California, San Francisco, California, U.S.A
| | - Tarik Tihan
- Department of Pathology, University of California, San Francisco, California, U.S.A
| | - Kurtis I Auguste
- Department of Neurological Surgery, UCSF Comprehensive Epilepsy Center, University of California, San Francisco, California, U.S.A.,Benioff Children's Hospital, University of California, San Francisco, California, U.S.A
| | - Robert C Knowlton
- Department of Neurology, University of California, San Francisco, California, U.S.A
| | - Susannah B Cornes
- Department of Neurology, University of California, San Francisco, California, U.S.A
| | - Edward F Chang
- Department of Neurological Surgery, UCSF Comprehensive Epilepsy Center, University of California, San Francisco, California, U.S.A
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17
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Gavaret M, Maillard L, Jung J. High-resolution EEG (HR-EEG) and magnetoencephalography (MEG). Neurophysiol Clin 2015; 45:105-11. [DOI: 10.1016/j.neucli.2014.11.011] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2014] [Accepted: 11/09/2014] [Indexed: 10/24/2022] Open
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18
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Catherwood D, Edgar GK, Nikolla D, Alford C, Brookes D, Baker S, White S. Mapping brain activity during loss of situation awareness: an EEG investigation of a basis for top-down influence on perception. HUMAN FACTORS 2014; 56:1428-1452. [PMID: 25509823 DOI: 10.1177/0018720814537070] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
OBJECTIVE The objective was to map brain activity during early intervals in loss of situation awareness (SA) to examine any co-activity in visual and high-order regions, reflecting grounds for top-down influences on Level I SA. BACKGROUND Behavioral and neuroscience evidence indicates that high-order brain areas can engage before perception is complete. Inappropriate top-down messages may distort perception during loss of SA. Evidence of co-activity of perceptual and high-order regions would not confirm such influence but may reflect a basis for it. METHOD SA and bias were measured using Quantitative Analysis of Situation Awareness and brain activity recorded with 128-channel EEG (electroencephalography) during loss of SA. One task (15 participants) required identification of a target pattern, and another task (10 participants) identification of "threat" in urban scenes. In both, the target was changed without warning, enforcing loss of SA. Key regions of brain activity were identified using source localization with standardized low-resolution electrical tomography (sLORETA) 150 to 160 ms post-stimulus onset in both tasks and also 100 to 110 ms in the second task. RESULTS In both tasks, there was significant loss of SA and bias shift (p < .02), associated at both 150- and 100-ms intervals with co-activity of visual regions and prefrontal, anterior cingulate and parietal regions linked to cognition under uncertainty. CONCLUSION There was early co-activity in high- order and visual perception regions that may provide a basis for top-down influence on perception. APPLICATION Co-activity in high- and low-order brain regions may explain either beneficial or disruptive top-down influence on perception affecting Level I SA in real-world operations.
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19
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Koessler L, Cecchin T, Colnat-Coulbois S, Vignal JP, Jonas J, Vespignani H, Ramantani G, Maillard LG. Catching the Invisible: Mesial Temporal Source Contribution to Simultaneous EEG and SEEG Recordings. Brain Topogr 2014; 28:5-20. [PMID: 25432598 DOI: 10.1007/s10548-014-0417-z] [Citation(s) in RCA: 85] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2014] [Accepted: 11/08/2014] [Indexed: 10/24/2022]
Affiliation(s)
- Laurent Koessler
- UMR 7039, CRAN, CNRS - Université de Lorraine, 2 Avenue de la forêt de Haye, 54516, Vandoeuvre-Lès-Nancy, France,
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20
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[French guidelines on electroencephalogram]. Neurophysiol Clin 2014; 44:515-612. [PMID: 25435392 DOI: 10.1016/j.neucli.2014.10.001] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2014] [Accepted: 10/07/2014] [Indexed: 12/11/2022] Open
Abstract
Electroencephalography allows the functional analysis of electrical brain cortical activity and is the gold standard for analyzing electrophysiological processes involved in epilepsy but also in several other dysfunctions of the central nervous system. Morphological imaging yields complementary data, yet it cannot replace the essential functional analysis tool that is EEG. Furthermore, EEG has the great advantage of being non-invasive, easy to perform and allows control tests when follow-up is necessary, even at the patient's bedside. Faced with the advances in knowledge, techniques and indications, the Société de Neurophysiologie Clinique de Langue Française (SNCLF) and the Ligue Française Contre l'Épilepsie (LFCE) found it necessary to provide an update on EEG recommendations. This article will review the methodology applied to this work, refine the various topics detailed in the following chapters. It will go over the summary of recommendations for each of these chapters and underline proposals for writing an EEG report. Some questions could not be answered by the review of the literature; in those cases, an expert advice was given by the working and reading groups in addition to the guidelines.
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21
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De Ciantis A, Barkovich AJ, Cosottini M, Barba C, Montanaro D, Costagli M, Tosetti M, Biagi L, Dobyns WB, Guerrini R. Ultra-high-field MR imaging in polymicrogyria and epilepsy. AJNR Am J Neuroradiol 2014; 36:309-16. [PMID: 25258368 DOI: 10.3174/ajnr.a4116] [Citation(s) in RCA: 84] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Polymicrogyria is a malformation of cortical development that is often identified in children with epilepsy or delayed development. We investigated in vivo the potential of 7T imaging in characterizing polymicrogyria to determine whether additional features could be identified. MATERIALS AND METHODS Ten adult patients with polymicrogyria previously diagnosed by using 3T MR imaging underwent additional imaging at 7T. We assessed polymicrogyria according to topographic pattern, extent, symmetry, and morphology. Additional imaging sequences at 7T included 3D T2* susceptibility-weighted angiography and 2D tissue border enhancement FSE inversion recovery. Minimum intensity projections were used to assess the potential of the susceptibility-weighted angiography sequence for depiction of cerebral veins. RESULTS At 7T, we observed perisylvian polymicrogyria that was bilateral in 6 patients, unilateral in 3, and diffuse in 1. Four of the 6 bilateral abnormalities had been considered unilateral at 3T. While 3T imaging revealed 2 morphologic categories (coarse, delicate), 7T susceptibility-weighted angiography images disclosed a uniform ribbonlike pattern. Susceptibility-weighted angiography revealed numerous dilated superficial veins in all polymicrogyric areas. Tissue border enhancement imaging depicted a hypointense line corresponding to the gray-white interface, providing a high definition of the borders and, thereby, improving detection of the polymicrogyric cortex. CONCLUSIONS 7T imaging reveals more anatomic details of polymicrogyria compared with 3T conventional sequences, with potential implications for diagnosis, genetic studies, and surgical treatment of associated epilepsy. Abnormalities of cortical veins may suggest a role for vascular dysgenesis in pathogenesis.
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Affiliation(s)
- A De Ciantis
- From the Pediatric Neurology Unit (A.D.C., C.B., R.G.), Meyer Children's Hospital, University of Florence, Florence, Italy
| | - A J Barkovich
- Department of Radiology and Biomedical Imaging (A.J.B.), University of California San Francisco, San Francisco, California
| | - M Cosottini
- Department of Translational Research and New Technologies in Medicine and Surgery (M. Cosottini), University of Pisa, Pisa, Italy IMAGO7 Foundation (M. Cosottini), Pisa, Italy
| | - C Barba
- From the Pediatric Neurology Unit (A.D.C., C.B., R.G.), Meyer Children's Hospital, University of Florence, Florence, Italy
| | - D Montanaro
- Fondazione Consiglio Nazionale delle Ricerche/Regione Toscana (D.M.), Unità Operativa Semplice Neuroradiologia, Pisa, Italy
| | - M Costagli
- Istituto di Ricovero e Cura a Carattere Scientifico Stella Maris Foundation (M. Costagli, M.T., L.B., R.G.), Pisa, Italy
| | - M Tosetti
- Istituto di Ricovero e Cura a Carattere Scientifico Stella Maris Foundation (M. Costagli, M.T., L.B., R.G.), Pisa, Italy
| | - L Biagi
- Istituto di Ricovero e Cura a Carattere Scientifico Stella Maris Foundation (M. Costagli, M.T., L.B., R.G.), Pisa, Italy
| | - W B Dobyns
- Center for Integrative Brain Research (W.B.D.), Seattle Children's Hospital, Seattle, Washington
| | - R Guerrini
- From the Pediatric Neurology Unit (A.D.C., C.B., R.G.), Meyer Children's Hospital, University of Florence, Florence, Italy Istituto di Ricovero e Cura a Carattere Scientifico Stella Maris Foundation (M. Costagli, M.T., L.B., R.G.), Pisa, Italy
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22
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Jonas J, Rossion B, Krieg J, Koessler L, Colnat-Coulbois S, Vespignani H, Jacques C, Vignal JP, Brissart H, Maillard L. Intracerebral electrical stimulation of a face-selective area in the right inferior occipital cortex impairs individual face discrimination. Neuroimage 2014; 99:487-97. [PMID: 24936686 DOI: 10.1016/j.neuroimage.2014.06.017] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2014] [Revised: 06/05/2014] [Accepted: 06/06/2014] [Indexed: 01/16/2023] Open
Abstract
During intracerebral stimulation of the right inferior occipital cortex, a patient with refractory epilepsy was transiently impaired at discriminating two simultaneously presented photographs of unfamiliar faces. The critical electrode contact was located in the most posterior face-selective brain area of the human brain (right "occipital face area", rOFA) as shown both by low- (ERP) and high-frequency (gamma) electrophysiological responses as well as a face localizer in fMRI. At this electrode contact, periodic visual presentation of 6 different faces by second evoked a larger electrophysiological periodic response at 6 Hz than when the same face identity was repeated at the same rate. This intracerebral EEG repetition suppression effect was markedly reduced when face stimuli were presented upside-down, a manipulation that impairs individual face discrimination. These findings provide original evidence for a causal relationship between the face-selective right inferior occipital cortex and individual face discrimination, independently of long-term memory representations. More generally, they support the functional value of electrophysiological repetition suppression effects, indicating that these effects can be used as an index of a necessary neural representation of the changing stimulus property.
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Affiliation(s)
- Jacques Jonas
- Service de Neurologie, Centre Hospitalier Universitaire de Nancy, 29 Avenue du Maréchal de Lattre de Tassigny, 54000 Nancy, France; Université de Lorraine, CRAN, UMR 7039, Campus Sciences, Boulevard des Aiguillettes, 54500 Vandœuvre-lès-Nancy, France; CNRS, CRAN, UMR 7039, Campus Sciences, Boulevard des Aiguillettes, 54500 Vandœuvre-lès-Nancy, France; Faculté de Médecine de Nancy, Université de Lorraine, 9 Avenue de la Forêt de Haye, 54500 Vandœuvre-lès-Nancy, France; Université Catholique de Louvain, 10 Place du Cardinal Mercier, 1348 Louvain-La-Neuve, Belgium.
| | - Bruno Rossion
- Université Catholique de Louvain, 10 Place du Cardinal Mercier, 1348 Louvain-La-Neuve, Belgium
| | - Julien Krieg
- Université de Lorraine, CRAN, UMR 7039, Campus Sciences, Boulevard des Aiguillettes, 54500 Vandœuvre-lès-Nancy, France; CNRS, CRAN, UMR 7039, Campus Sciences, Boulevard des Aiguillettes, 54500 Vandœuvre-lès-Nancy, France
| | - Laurent Koessler
- Université de Lorraine, CRAN, UMR 7039, Campus Sciences, Boulevard des Aiguillettes, 54500 Vandœuvre-lès-Nancy, France; CNRS, CRAN, UMR 7039, Campus Sciences, Boulevard des Aiguillettes, 54500 Vandœuvre-lès-Nancy, France
| | - Sophie Colnat-Coulbois
- Faculté de Médecine de Nancy, Université de Lorraine, 9 Avenue de la Forêt de Haye, 54500 Vandœuvre-lès-Nancy, France; Service de Neurochirurgie, Centre Hospitalier Universitaire de Nancy, 29 Avenue du Maréchal de Lattre de Tassigny, 54000 Nancy, France
| | - Hervé Vespignani
- Service de Neurologie, Centre Hospitalier Universitaire de Nancy, 29 Avenue du Maréchal de Lattre de Tassigny, 54000 Nancy, France; Université de Lorraine, CRAN, UMR 7039, Campus Sciences, Boulevard des Aiguillettes, 54500 Vandœuvre-lès-Nancy, France; CNRS, CRAN, UMR 7039, Campus Sciences, Boulevard des Aiguillettes, 54500 Vandœuvre-lès-Nancy, France; Faculté de Médecine de Nancy, Université de Lorraine, 9 Avenue de la Forêt de Haye, 54500 Vandœuvre-lès-Nancy, France
| | - Corentin Jacques
- Université Catholique de Louvain, 10 Place du Cardinal Mercier, 1348 Louvain-La-Neuve, Belgium
| | - Jean-Pierre Vignal
- Service de Neurologie, Centre Hospitalier Universitaire de Nancy, 29 Avenue du Maréchal de Lattre de Tassigny, 54000 Nancy, France; Université de Lorraine, CRAN, UMR 7039, Campus Sciences, Boulevard des Aiguillettes, 54500 Vandœuvre-lès-Nancy, France; CNRS, CRAN, UMR 7039, Campus Sciences, Boulevard des Aiguillettes, 54500 Vandœuvre-lès-Nancy, France
| | - Hélène Brissart
- Service de Neurologie, Centre Hospitalier Universitaire de Nancy, 29 Avenue du Maréchal de Lattre de Tassigny, 54000 Nancy, France
| | - Louis Maillard
- Service de Neurologie, Centre Hospitalier Universitaire de Nancy, 29 Avenue du Maréchal de Lattre de Tassigny, 54000 Nancy, France; Université de Lorraine, CRAN, UMR 7039, Campus Sciences, Boulevard des Aiguillettes, 54500 Vandœuvre-lès-Nancy, France; CNRS, CRAN, UMR 7039, Campus Sciences, Boulevard des Aiguillettes, 54500 Vandœuvre-lès-Nancy, France; Faculté de Médecine de Nancy, Université de Lorraine, 9 Avenue de la Forêt de Haye, 54500 Vandœuvre-lès-Nancy, France
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Evaluating dipolar source localization feasibility from intracerebral SEEG recordings. Neuroimage 2014; 98:118-33. [PMID: 24795155 DOI: 10.1016/j.neuroimage.2014.04.058] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2013] [Revised: 03/26/2014] [Accepted: 04/22/2014] [Indexed: 11/23/2022] Open
Abstract
Stereo-electroencephalography (SEEG) is considered as the golden standard for exploring targeted structures during pre-surgical evaluation in drug-resistant partial epilepsy. The depth electrodes, inserted in the brain, consist of several collinear measuring contacts (sensors). Clinical routine analysis of SEEG signals is performed on bipolar montage, providing a focal view of the explored structures, thus eliminating activities of distant sources that propagate through the brain volume. We propose in this paper to exploit the common reference SEEG signals. In this case, the volume propagation information is preserved and electrical source localization (ESL) approaches can be proposed. Current ESL approaches used to localize and estimate the activity of the neural generators are mainly based on surface EEG/MEG signals, but very few studies exist on real SEEG recordings, and the case of equivalent current dipole source localization has not been explored yet in this context. In this study, we investigate the influence of volume conduction model, spatial configuration of SEEG sensors and level of noise on the ESL accuracy, using a realistic simulation setup. Localizations on real SEEG signals recorded during intracerebral electrical stimulations (ICS, known sources) as well as on epileptic interictal spikes are carried out. Our results show that, under certain conditions, a straightforward approach based on an equivalent current dipole model for the source and on simple analytical volume conduction models yields sufficiently precise solutions (below 10mm) of the localization problem. Thus, electrical source imaging using SEEG signals is a promising tool for distant brain source investigation and might be used as a complement to routine visual interpretations.
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Rikir E, Koessler L, Gavaret M, Bartolomei F, Colnat-Coulbois S, Vignal JP, Vespignani H, Ramantani G, Maillard LG. Electrical source imaging in cortical malformation-related epilepsy: A prospective EEG-SEEG concordance study. Epilepsia 2014; 55:918-32. [DOI: 10.1111/epi.12591] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/07/2014] [Indexed: 11/27/2022]
Affiliation(s)
- Estelle Rikir
- Neurology Department; University Hospital of Nancy; Nancy France
- Neurology Department; University Hospital of Sart-Tilman; Liege Belgium
- Medical Faculty; Liege University; Liege Belgium
| | - Laurent Koessler
- CRAN; UMR 7039; Lorraine University; Vandœuvre-lès-Nancy Cedex France
- CNRS; CRAN; UMR 7039; Vandœuvre-lès-Nancy Cedex France
| | - Martine Gavaret
- Clinical Neurophysiology Department; AP-HM; University Hospital la Timone; Marseille France
- INSERM UMR 1106; Institut de Neurosciences des Systèmes; Marseille France
- Medical Faculty; Aix-Marseille University; Marseille France
| | - Fabrice Bartolomei
- Clinical Neurophysiology Department; AP-HM; University Hospital la Timone; Marseille France
- INSERM UMR 1106; Institut de Neurosciences des Systèmes; Marseille France
- Medical Faculty; Aix-Marseille University; Marseille France
| | - Sophie Colnat-Coulbois
- Medical Faculty; Lorraine University; Nancy France
- Neurosurgery Department; University Hospital of Nancy; Nancy France
| | - Jean-Pierre Vignal
- Neurology Department; University Hospital of Nancy; Nancy France
- CRAN; UMR 7039; Lorraine University; Vandœuvre-lès-Nancy Cedex France
- CNRS; CRAN; UMR 7039; Vandœuvre-lès-Nancy Cedex France
| | - Herve Vespignani
- Neurology Department; University Hospital of Nancy; Nancy France
- CRAN; UMR 7039; Lorraine University; Vandœuvre-lès-Nancy Cedex France
- CNRS; CRAN; UMR 7039; Vandœuvre-lès-Nancy Cedex France
- Medical Faculty; Lorraine University; Nancy France
| | | | - Louis G. Maillard
- Neurology Department; University Hospital of Nancy; Nancy France
- CRAN; UMR 7039; Lorraine University; Vandœuvre-lès-Nancy Cedex France
- CNRS; CRAN; UMR 7039; Vandœuvre-lès-Nancy Cedex France
- Medical Faculty; Lorraine University; Nancy France
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Jonas J, Frismand S, Vignal JP, Colnat-Coulbois S, Koessler L, Vespignani H, Rossion B, Maillard L. Right hemispheric dominance of visual phenomena evoked by intracerebral stimulation of the human visual cortex. Hum Brain Mapp 2013; 35:3360-71. [PMID: 24733699 DOI: 10.1002/hbm.22407] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2013] [Revised: 08/07/2013] [Accepted: 09/11/2013] [Indexed: 11/11/2022] Open
Abstract
Electrical brain stimulation can provide important information about the functional organization of the human visual cortex. Here, we report the visual phenomena evoked by a large number (562) of intracerebral electrical stimulations performed at low-intensity with depth electrodes implanted in the occipito-parieto-temporal cortex of 22 epileptic patients. Focal electrical stimulation evoked primarily visual hallucinations with various complexities: simple (spot or blob), intermediary (geometric forms), or complex meaningful shapes (faces); visual illusions and impairments of visual recognition were more rarely observed. With the exception of the most posterior cortical sites, the probability of evoking a visual phenomenon was significantly higher in the right than the left hemisphere. Intermediary and complex hallucinations, illusions, and visual recognition impairments were almost exclusively evoked by stimulation in the right hemisphere. The probability of evoking a visual phenomenon decreased substantially from the occipital pole to the most anterior sites of the temporal lobe, and this decrease was more pronounced in the left hemisphere. The greater sensitivity of the right occipito-parieto-temporal regions to intracerebral electrical stimulation to evoke visual phenomena supports a predominant role of right hemispheric visual areas from perception to recognition of visual forms, regardless of visuospatial and attentional factors.
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Affiliation(s)
- Jacques Jonas
- Service de Neurologie, Centre Hospitalier Universitaire de Nancy, Nancy, France; Université de Lorraine, CRAN, UMR 7039, Nancy, France; Faculté de Médecine de Nancy, Université de Lorraine, Nancy, France; Université Catholique de Louvain, IPSY, IoNS, Louvain-la-Neuve, Belgique; CNRS, CRAN, UMR 7039, Nancy, France
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Ramantani G, Koessler L, Colnat-Coulbois S, Vignal JP, Isnard J, Catenoix H, Jonas J, Zentner J, Schulze-Bonhage A, Maillard LG. Intracranial evaluation of the epileptogenic zone in regional infrasylvian polymicrogyria. Epilepsia 2012; 54:296-304. [DOI: 10.1111/j.1528-1167.2012.03667.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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27
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A unified treatment of the reference estimation problem in depth EEG recordings. Med Biol Eng Comput 2012; 50:1003-15. [DOI: 10.1007/s11517-012-0946-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2011] [Accepted: 08/01/2012] [Indexed: 11/25/2022]
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28
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Chassoux F. Malformazioni dello sviluppo corticale. Neurologia 2012. [DOI: 10.1016/s1634-7072(12)62060-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Jonas J, Descoins M, Koessler L, Colnat-Coulbois S, Sauvée M, Guye M, Vignal JP, Vespignani H, Rossion B, Maillard L. Focal electrical intracerebral stimulation of a face-sensitive area causes transient prosopagnosia. Neuroscience 2012; 222:281-8. [PMID: 22813996 DOI: 10.1016/j.neuroscience.2012.07.021] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2012] [Revised: 07/05/2012] [Accepted: 07/07/2012] [Indexed: 10/28/2022]
Abstract
Face perception is subtended by a large set of areas in the human ventral occipito-temporal cortex. However, the role of these areas and their importance for face recognition remain largely unclear. Here we report a case of transient selective impairment in face recognition (prosopagnosia) induced by focal electrical intracerebral stimulation of the right inferior occipital gyrus. This area presents with typical face-sensitivity as evidenced by functional neuroimaging right occipital face area (OFA). A face-sensitive intracerebral N170 was also recorded in this area, supporting its contribution as a source of the well-known N170 component typically recorded on the scalp. Altogether, these observations indicate that face recognition can be selectively impaired by local disruption of a single face-sensitive area of the network subtending this function, the right OFA.
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Affiliation(s)
- J Jonas
- Service de Neurologie, Centre Hospitalier Universitaire de Nancy, 29 Avenue du Maréchal de Lattre de Tasssigny, 54000 Nancy, France.
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Hofmanis J, Ruiz RAS, Caspary O, Ranta R, Louis-Dorr V. Extraction of deep brain stimulation (DBS) source in SEEG using EMD and ICA. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2012; 2011:834-7. [PMID: 22254440 DOI: 10.1109/iembs.2011.6090191] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
In the context of drug resistant partial epilepsy, intra-cerebral electrical stimulation (Deep Brain Stimulation) constitutes one of the means of investigation to locate epileptic volume. This exogenous source can then activate the underlying epileptic networks and generate an electrophysiological reaction. The purpose of this work is to estimate and eliminate the overlapping electrical stimulation signal in order to subsequently explore the provoked underlying electrical activity. We propose here several methods to tackle this problem, using two different approaches based on different assumptions: BSS approach based on Independent Component Analysis (ICA) and non parametric decomposition - empirical modes decomposition (EMD) algorithms.
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Affiliation(s)
- Janis Hofmanis
- Centre de Recherche en Automatique de Nancy,Nancy-Université, CNRS.
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31
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Person C, Koessler L, Louis-Dorr V, Wolf D, Maillard L, Marie PY. Analysis of the relationship between interictal electrical source imaging and PET hypometabolism. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2011; 2010:3723-6. [PMID: 21096861 DOI: 10.1109/iembs.2010.5627512] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The aim of this paper is to compare interictal EEG source localizations with statistical analysis of hypometabolisms in PET brain imaging. Both methods are currently used in the pre-surgical evaluation of drug-resistant partial epilepsy, but the relationship between electrical source localizations and hypometabolic areas has not been well defined yet. At the present time, these two methods have been performed on five patients in order to develop a comparative quantitative study with these first results which should be then extended to a larger patient database.
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Affiliation(s)
- C Person
- Centre de Recherche en Automatique de Nancy (CRAN, UMR 7039), Nancy-Université, CNRS, France.
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EEG–MRI Co-registration and Sensor Labeling Using a 3D Laser Scanner. Ann Biomed Eng 2010; 39:983-95. [DOI: 10.1007/s10439-010-0230-0] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2010] [Accepted: 11/26/2010] [Indexed: 10/18/2022]
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Koessler L, Benar C, Maillard L, Badier JM, Vignal JP, Bartolomei F, Chauvel P, Gavaret M. Source localization of ictal epileptic activity investigated by high resolution EEG and validated by SEEG. Neuroimage 2010; 51:642-53. [PMID: 20206700 DOI: 10.1016/j.neuroimage.2010.02.067] [Citation(s) in RCA: 88] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2009] [Revised: 01/05/2010] [Accepted: 02/23/2010] [Indexed: 11/16/2022] Open
Abstract
High resolution electroencephalography (HR-EEG) combined with source localization methods has mainly been used to study interictal spikes and there have been few studies comparing source localization of scalp ictal patterns with depth EEG. To address this issue, 10 patients with four different scalp ictal patterns (ictal spikes, rhythmic activity, paroxysmal fast activity, obscured) were investigated by both HR-EEG and stereoelectroencephalography (SEEG). Sixty-four scalp-EEG sensors and a sampling rate of 1kHz were used to record scalp ictal patterns. Five different source models (moving dipole, rotating dipole, MUSIC, LORETA, and sLORETA) were used in order to perform source localization. Seven to 10 intracerebral electrodes were implanted during SEEG investigations. For each source model, the concordance between ictal source localization and epileptogenic zone defined by SEEG was assessed. Results were considered to agree if they localized in the same sublobar area as defined by a trained epileptologist. Across the study population, the best concordance between source localization methods and SEEG (9/10) was obtained with equivalent current dipole modeling. MUSIC and LORETA had a concordance of 7/10 whereas sLORETA had a concordance of only 5/10. Four of our patients classified into different groups (ictal spikes, paroxysmal fast activity, obscured) had complete concordance between source localization methods and SEEG. A high signal to noise ratio, a short time window of analysis (<1s) and bandpass filtering around the frequency of rhythmic activity allowed improvement of the source localization results. A high level of agreement between source localization methods and SEEG can be obtained for ictal spike patterns and for scalp-EEG paroxysmal fact activities whereas scalp rhythmic discharges can be accurately localized but originated from seizure propagation network.
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Cecchin T, Ranta R, Koessler L, Caspary O, Vespignani H, Maillard L. Seizure lateralization in scalp EEG using Hjorth parameters. Clin Neurophysiol 2010; 121:290-300. [DOI: 10.1016/j.clinph.2009.10.033] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2009] [Revised: 09/23/2009] [Accepted: 10/24/2009] [Indexed: 11/28/2022]
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35
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Koessler L, Salido-Ruiz R, Ranta R, Louis-Dorr V, Gavaret M, Maillard L. Influence of source separation and montage on ictal source localization. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2010; 2010:2898-2901. [PMID: 21095980 DOI: 10.1109/iembs.2010.5626321] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The aim of this paper is to evaluate the influence of the reference electrode (introduced to form an augmented average montage) and of the artifact elimination by blind source separation on the ictal electrical source imaging. We present here a preliminary study on one patient only. The results seem to indicate that the montage (and thus the reference handling method) has a limited but existent influence on the quality of the source localization. Artifact elimination highly improves this quality as well.
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Affiliation(s)
- L Koessler
- Centre de Recherche en Automatique de Nancy (CRAN, UMR 7039), Nancy-Université, CNRS, France.
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