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Sroubek J, Kramska L, Cesak T, Amlerova J, Keller J, Vojtech Z. Ultrasound-Navigated Multiple Hippocampal Transections: An Anatomical Study. J Neurol Surg A Cent Eur Neurosurg 2024. [PMID: 38253328 DOI: 10.1055/s-0043-1771276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2024]
Abstract
BACKGROUND Multiple hippocampal transection (MHT) is a surgical technique used for the treatment of drug-resistant mesial temporal lobe epilepsy in situations where standard procedures would pose a high risk for memory deterioration. During MHT, the longitudinal fibers of the hippocampus, implicated in epilepsy spreading, are interrupted, while the transverse memory circuits are spared. The extent of MHT is governed by intraoperative electrocorticography; abolition of epileptic discharges serves as an end point to terminate the transection. In other words, the aim of MHT is not the anatomical completeness of hippocampal transection. In contrast, we hypothesize that only the complete transection of hippocampal cross-section is needed to durably terminate epilepsy, avoiding possible postoperative reorganization of longitudinal pathways. Here, we report an anatomical study designed to evaluate the feasibility of complete transection of hippocampus with the aid of ultrasound neuronavigation and we propose new instruments to reach this goal. METHODS Five cadaveric brains were analyzed in this study. MHT was performed on both sides of each brain either with or without ultrasound neuronavigation. The percentage of transected cross-section of the hippocampus was measured using magnetic resonance imaging (MRI) and both sides were compared. RESULTS The ultrasound-guided MHTs were more likely to achieve complete hippocampal transection compared with the nonnavigated MHT transection (73 vs 58%; p < 0.01). Our study also allowed us to propose specialized transectors to minimize invasivity of this procedure. CONCLUSION Completeness of MHT can be better reached with the aid of an ultrasound neuronavigation system; modified instruments for this procedure were also designed.
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Affiliation(s)
- Jan Sroubek
- Department of Neurosurgery, Na Homolce Hospital, Prague, Czech Republic
- Department of Neurosurgery, Charles University Faculty of Medicine in Hradec Kralove, Hradec Kralove, Czech Republic
| | - Lenka Kramska
- Department of Clinical Psychology, Na Homolce Hospital, Prague, Czech Republic
| | - Tomas Cesak
- Department of Neurosurgery, Charles University Faculty of Medicine in Hradec Kralove, Hradec Kralove, Czech Republic
| | - Jana Amlerova
- Department of Neurology, Motol University Hospital, Praha, Czech Republic
| | - Jiri Keller
- Department of Radiology, Na Homolce Hospital, Prague, Czech Republic
| | - Zdenek Vojtech
- Department of Neurology, Na Homolce Hospital, Prague, Czech Republic
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King-Stephens D. Old Diagnostic Meets Newer Therapy; ECoG During LiTT. Epilepsy Curr 2023; 23:233-234. [PMID: 37662453 PMCID: PMC10470095 DOI: 10.1177/15357597231171291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/05/2023] Open
Abstract
Intraoperative Electrocorticography During Laser-Interstitial Thermal Therapy Predicts Seizure Outcome in Mesial Temporal Lobe Epilepsy Chen, B, Grewal SS, Middlebrooks EH, Tatum WO, Ritaccio AL, Sirven JI, Freqund BE, Feyissa AM. Clin Neurophysiol. 2023;146:118-123. doi:10.1016/j.clinph.2022.12.003 Background and Objectives: Magnetic resonance-guided laser interstitial thermal therapy (MRLiTT) for treating temporal lobe epilepsy has recently gained popularity. We aimed to investigate the predictive value of pre-and post-MRLiTT epileptiform discharges (EDs) on intraoperative electrocorticography (iECoG) in seizure outcomes for patients with mesial temporal lobe epilepsy (mTLE). Methods: We conducted a pilot, prospective single-center cohort study on seven consecutive patients with mTLE that underwent MRLiTT. Pre- and post-MRLiTT iECoG was performed using a 1×8 contact depth electrode along the same trajectory used for the laser catheter. Findings: The responders had a robust reduction in ED frequency compared to pre-MRLiTT iECoG (86% vs 13%, p < 0.01). Clinical characteristics, including risk factors for epilepsy, duration of epilepsy, presence of mesial temporal lobe sclerosis, prior intracranial monitoring, the absolute frequency of pre- or post-MRLiTT EDs, and ablation volume were not significantly associated with responder status. Discussion: This is the first demonstration that intraoperative reduction in EDs during mesial temporal lobe MRLiTT may potentially predict seizure outcomes and may serve as an intraoperative biomarker for satisfactory ablation. However, larger prospective studies are needed to confirm our findings and evaluate the utility of iECoG during MRLiTT.
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Pitskhelauri D, Kudieva E, Vlasov P, Eliseeva N, Zaitsev O, Kamenetskaya M, Kozlova A, Shishkina L, Danilov G, Sanikidze A, Kuprava T, Ishkinin R, Melikyan A. Burr hole microsurgical subtemporal selective amygdalohippocampectomy. Acta Neurochir (Wien) 2023; 165:1215-1226. [PMID: 36867249 DOI: 10.1007/s00701-023-05536-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Accepted: 02/15/2023] [Indexed: 03/04/2023]
Abstract
INTRODUCTION At present, selective amygdalohippocampectomy (SAH) has become popular in the treatment of drug-resistant mesial temporal lobe epilepsy (TLE). However, there is still an ongoing discussion about the advantages and disadvantages of this approach. METHODS The study included a consecutive series of 43 adult patients with drug-resistant TLE, involving 24 women and 19 men (1.8/1). Surgeries were performed at the Burdenko Neurosurgery Center from 2016 to 2019. To perform subtemporal SAH through the burr hole with the diameter of 14 mm, we used two types of approaches: preauricular, 25 cases, and supra-auricular, 18 cases. The follow-up ranged from 36 to 78 months (median 59 months). One patient died 16 months after surgery (accident). RESULTS By the third year after surgery, Engel I outcome was achieved in 80.9% (34 cases) of cases and Engel II in 4 (9.5%) and Engel III and Engel IV in 4 (9.6%) cases. Among the patients with Engel I outcomes, anticonvulsant therapy was completed in 15 (44.1%), and doses were reduced in 17 (50%) cases. Verbal and delayed verbal memory decreased after surgery in 38.5% and 46.1%, respectively. Verbal memory was mainly affected by preauricular approach in comparison with supra-auricular (p = 0.041). In 15 (51.7%) cases, minimal visual field defects were detected in the upper quadrant. At the same time, visual field defects did not extend into the lower quadrant and inside the 20° of the upper affected quadrant in any case. CONCLUSIONS Burr hole microsurgical subtemporal SAH is an effective surgical procedure for drug-resistant TLE. It involves minimal risks of loss of visual field within the 20° of the upper quadrant. Supra-auricular approach, compared to preauricular, results in a reduction in the incidence of upper quadrant hemianopia and is associated with a lower risk of verbal memory impairment.
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Affiliation(s)
- David Pitskhelauri
- N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, 16 4th Tverskaya-Yamskaya St, 125047, Moscow, Russia.
| | - Elina Kudieva
- N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, 16 4th Tverskaya-Yamskaya St, 125047, Moscow, Russia
| | - Pavel Vlasov
- N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, 16 4th Tverskaya-Yamskaya St, 125047, Moscow, Russia
| | - Natalya Eliseeva
- N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, 16 4th Tverskaya-Yamskaya St, 125047, Moscow, Russia
| | - Oleg Zaitsev
- N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, 16 4th Tverskaya-Yamskaya St, 125047, Moscow, Russia
| | - Maria Kamenetskaya
- N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, 16 4th Tverskaya-Yamskaya St, 125047, Moscow, Russia
| | - Antonina Kozlova
- N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, 16 4th Tverskaya-Yamskaya St, 125047, Moscow, Russia
| | - Ludmila Shishkina
- N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, 16 4th Tverskaya-Yamskaya St, 125047, Moscow, Russia
| | - Gleb Danilov
- N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, 16 4th Tverskaya-Yamskaya St, 125047, Moscow, Russia
| | - Alexander Sanikidze
- N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, 16 4th Tverskaya-Yamskaya St, 125047, Moscow, Russia
| | | | - Ruslan Ishkinin
- N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, 16 4th Tverskaya-Yamskaya St, 125047, Moscow, Russia
| | - Armen Melikyan
- N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, 16 4th Tverskaya-Yamskaya St, 125047, Moscow, Russia
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Fountas K. Commentary: Continuous Intraoperative Neurophysiologic Monitoring of the Motor Pathways Using Depth Electrodes During Surgical Resection of an Epileptogenic Lesion: A Novel Technique. Oper Neurosurg (Hagerstown) 2021; 20:E386-E387. [PMID: 33548923 DOI: 10.1093/ons/opaa481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2020] [Accepted: 11/27/2020] [Indexed: 11/13/2022] Open
Affiliation(s)
- Konstantinos Fountas
- Department of Neurosurgery, Faculty of Medicine, University of Thessaly, Larissa, Greece
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Roessler K, Heynold E, Buchfelder M, Stefan H, Hamer HM. Current value of intraoperative electrocorticography (iopECoG). Epilepsy Behav 2019; 91:20-24. [PMID: 30420228 DOI: 10.1016/j.yebeh.2018.06.053] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Revised: 06/28/2018] [Accepted: 06/29/2018] [Indexed: 11/26/2022]
Abstract
OBJECTIVE Intraoperative electrocorticography (iopECoG) can contribute to delineate the resection borders of the anticipated epileptogenic zone in epilepsy surgery. However, it has several caveats that should be considered to avoid incorrect interpretation during intraoperative monitoring. METHODS The literature on iopECoG application was reviewed, and pros and cons as well as obstacles to this technique were analyzed. RESULTS The literature of the first half of the nineties was very enthusiastic in using iopECoG for tailoring the resection in temporal as well as extratemporal epilepsy surgery. Mostly, this resulted in a good correlation of postresection ECoG and excellent seizure outcome. In the second half of the nineties, many authors demonstrated lack of correlation between iopECoG and postoperative seizure outcome, especially in surgery for temporal lobe epilepsy with hippocampal sclerosis. In the noughties, investigators found that ECoG was significantly useful in neocortical lesional temporal lobe epilepsy as well as in extratemporal lesional epilepsies. Extratemporal epilepsy without lesions proved to be more a domain of chronic extraoperative ECoG, especially using depth electrode recordings. In recent years, iopECoG detecting high-frequency oscillations (ripples, 80-250 Hz, fast ripples, 250-500 Hz) for tailored resection was found to allow intraoperative prediction of postoperative seizure outcome. CONCLUSION After a period of scepticism, iopECoG seems back in the focus of interest for intraoperative guidance of resecting epileptogenic tissue to raise postoperative favorable seizure outcome. In temporal and extratemporal lesional epilepsies, especially in cases of focal cortical dysplasia, tuberous sclerosis, or cavernous malformations, an excellent correlation between iopECoG-guided resection and postoperative seizure relief was found.
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Affiliation(s)
- Karl Roessler
- Neurosurgical Clinic, University Hospital Erlangen, Germany.
| | | | | | - Hermann Stefan
- Epilepsy Center, Neurological Clinic, University Hospital Erlangen, Germany
| | - Hajo M Hamer
- Epilepsy Center, Neurological Clinic, University Hospital Erlangen, Germany
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Shah AK, Fuerst D, Mittal S. Intraoperative hippocampal electrocorticography frequently captures electrographic seizures and correlates with hippocampal pathology. Clin Neurophysiol 2018; 129:717-723. [PMID: 29438820 DOI: 10.1016/j.clinph.2018.01.055] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Revised: 12/05/2017] [Accepted: 01/10/2018] [Indexed: 10/18/2022]
Abstract
OBJECTIVE Relationship between electrographic seizures on hippocampal electrocorticography (IH-ECoG) and presence/type of hippocampal pathology remains unclear. METHODS IH-ECoG was recorded for 10-20 min from the ventricular surface of the hippocampus following removal of the temporal neocortex in 40 consecutive patients. Correlation between intraoperative hippocampal seizures and preoperative MRI, hippocampal histopathology, and EEG from invasive monitoring was determined. RESULTS IH-ECoG captured electrographic seizures in 15/40 patients (in 8/23 with abnormal hippocampal signal on MRI and 7/17 patients without MRI abnormality). Hippocampal neuronal loss was observed in 22/40 (Group 1), while 18/40 had no significant neuronal loss (Group 2). In Group 1, 4/22 had seizures on IH-ECoG, while 11/18 had electrographic seizures in Group 2. In 24/40 patients who underwent prolonged extraoperative intracranial EEG (IC-EEG) recording, hippocampal seizures were captured in 14. Of these, 7 also had seizures during IH-ECoG. In 10/24 IC-EEG patients without seizures, 3 had seizures on IH-ECoG. CONCLUSIONS IH-ECoG frequently captures spontaneous electrographic seizures. These are more likely to occur in patients with pathologic processes that do not disrupt/infiltrate hippocampus compared to patients with intractable epilepsy associated with disrupted hippocampal architecture. SIGNIFICANCE Intraoperative hippocampal seizures may result from deafferentation from the temporal neocortex and disinhibition of the perforant pathway.
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Affiliation(s)
- Aashit K Shah
- Department of Neurology, Wayne State University, Detroit, MI, USA; Comprehensive Epilepsy Center, Detroit Medical Center, Wayne State University, Detroit, MI, USA
| | - Darren Fuerst
- Comprehensive Epilepsy Center, Detroit Medical Center, Wayne State University, Detroit, MI, USA
| | - Sandeep Mittal
- Comprehensive Epilepsy Center, Detroit Medical Center, Wayne State University, Detroit, MI, USA; Department of Neurosurgery, Wayne State University, Detroit, MI, USA; Department of Oncology, Wayne State University, Detroit, MI, USA; Karmanos Cancer Institute, Wayne State University, Detroit, MI, USA.
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Electrocorticographic Patterns in Epilepsy Surgery and Long-Term Outcome. J Clin Neurophysiol 2017; 34:520-526. [DOI: 10.1097/wnp.0000000000000407] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Spike densities of the amygdala and neocortex reflect progression of kindled motor seizures. Med Biol Eng Comput 2017; 56:99-112. [PMID: 28674781 DOI: 10.1007/s11517-017-1672-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Accepted: 06/15/2017] [Indexed: 10/19/2022]
Abstract
Amygdala kindling is a common temporal lobe-like seizure model. In the present study, temporal and spectral analyses of the ictal period were investigated throughout amygdala kindling in response to different behavioral seizures. Right-side amygdala was kindled to induce epileptiform afterdischarges (ADs). ADs of both the frontal cortex and amygdala were analyzed. Powers of the low (0-9 Hz)- and high (12-30 Hz)-frequency bands in response to different behavioral seizures were calculated. Densities of upward and downward peaks of spikes, which reflected information of spike count and spike pattern, throughout kindle-induced ADs were calculated. Progression was seen in the temporal and spectral characteristics of amygdala-kindled ADs in response to behaviors. Numbers of significant differences of all 1-s AD segments between two Racine's seizure stages were significantly higher in upward and downward indexes of the temporal spike than those using the spectral method in both the amygdala and neocortex. Ability for distinguishing seizure stages was significantly higher in temporal spike density of amygdala ADs compared to those of frontal ADs. Our results showed that amygdala kindling caused spectrotemporal changes of activities in the amygdala and frontal cortex. The density of spike-related peaks had better distinguishability in response to behavioral seizures, particularly in a seizure zone of amygdala. The present study provides a new temporal index of spike's peak density to understand progression of motor seizures in the kindling process.
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Predictive Value of Electrocorticography in Patients With Mesial Temporal Lobe Epilepsy Undergoing Selective Amygdalohippocampectomy. J Clin Neurophysiol 2017; 34:370-374. [DOI: 10.1097/wnp.0000000000000376] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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Tyrand R, Momjian S, Pollo C, Lysakowski C, Lascano AM, Vulliémoz S, Schaller K, Boëx C. Continuous Intraoperative Monitoring of Temporal Lobe Epilepsy Surgery. Stereotact Funct Neurosurg 2016; 94:404-412. [PMID: 27997922 DOI: 10.1159/000452842] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2016] [Accepted: 10/18/2016] [Indexed: 11/19/2022]
Abstract
BACKGROUND/AIMS The monitoring of interictal epileptiform discharge rates (IEDRs) all along anterior temporal lobe resections (ATLRs) has never been reported. Here the effect of ATLR on continuous IEDR monitoring is described. METHODS IEDRs computed automatically during entire interventions were recorded in 34 patients (38.2%, 13/34 depth; 61.8%, 21/34 scalp electrodes only). Monitorings were invalidated when burst suppression occurred or if initial IEDRs were <5. RESULTS Monitoring was successful for 69.2% (9/13) of the patients with depth recordings and for 4.8% (1/21) of the patients with scalp recordings. Burst suppressions precluded it in 30.8% (4/13) of the depth and in 57.1% (12/21) of the scalp recordings. Initial IEDRs were <5 for 38.1% (8/21) of the scalp recordings. Significant IEDR decreases were observed in 8/10 patients with successful monitoring. These decreases started with resection of the superior temporal gyrus. IEDRs decreased further with amygdalohippocampectomy in 3/5 patients. At the 12-month follow-up, all patients with IEDR decreases remained seizure free; both patients without did not. CONCLUSION IEDR monitoring was possible with depth, but not with scalp electrodes. IEDR decreases started with resection of the superior temporal gyrus. A larger patient cohort is necessary to confirm the high predictive values of IEDR monitoring that could become a tool for surgery customization.
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Affiliation(s)
- Rémi Tyrand
- Department of Neurology, University Hospitals of Geneva, Geneva, Switzerland
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Intraoperative ECoG During MRI-Guided Laser-Interstitial Thermal Therapy for Intractable Epilepsy. J Clin Neurophysiol 2016; 33:e28-30. [DOI: 10.1097/wnp.0000000000000299] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Uda T, Morino M, Minami N, Matsumoto T, Uchida T, Kamei T. Abnormal discharges from the temporal neocortex after selective amygdalohippocampectomy and seizure outcomes. J Clin Neurosci 2015; 22:1797-801. [PMID: 26256064 DOI: 10.1016/j.jocn.2015.03.063] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2015] [Revised: 03/17/2015] [Accepted: 03/18/2015] [Indexed: 11/28/2022]
Abstract
The present study examined the relationship between residual discharges from the temporal neocortex postoperatively and seizure outcomes, in mesial temporal lobe epilepsy (MTLE) patients with hippocampal sclerosis (HS) who were treated with selective amygdalohippocampectomy (SelAH). Abnormal discharges from the temporal neocortex are often observed and remain postoperatively. However, no recommendations have been made regarding whether additional procedures to eliminate these discharges should be performed for seizure relief. We retrospectively analyzed 28 patients with unilateral MTLE and HS, who underwent transsylvian SelAH. The mean follow-up period was 29 months (range: 16-49). In the pre- and postresection states, electrocorticography (ECoG) was recorded for the temporal base and lateral temporal cortex. The extent of resection was not influenced by the results of the preresection ECoG. Even if residual abnormal discharges were identified on the temporal neocortex, no additional procedures were undertaken to eliminate these abnormalities. The postresection spike counts were examined to determine the postresective alterations in spike count, and the frequency of residual spike count. The seizure outcomes were evaluated in all patients using the Engel classification. The postoperative seizure-free rate was 92.9%. No significant correlations were seen between a decreasing spike count and seizure outcomes (p=0.9259), or between the absence of residual spikes and seizure outcomes (p=1.000). Residual spikes at the temporal neocortex do not appear to influence seizure outcomes. Only mesial temporal structures should be removed, and additional procedures to eliminate residual spikes are not required.
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Affiliation(s)
- Takehiro Uda
- Department of Neurosurgery, Osaka City University Graduate School of Medicine, 1-4-3 Asahimachi, Abeno-ku, Osaka 545-8585, Japan; Department of Neurosurgery, Tokyo Metropolitan Neurological Hospital, Tokyo, Japan.
| | - Michiharu Morino
- Department of Neurosurgery, Tokyo Metropolitan Neurological Hospital, Tokyo, Japan
| | - Noriaki Minami
- Department of Neurosurgery, Tokyo Metropolitan Neurological Hospital, Tokyo, Japan
| | - Takahiro Matsumoto
- Department of Neurosurgery, Tokyo Metropolitan Neurological Hospital, Tokyo, Japan
| | - Tatsuya Uchida
- Department of Neurosurgery, Tokyo Metropolitan Neurological Hospital, Tokyo, Japan
| | - Takamasa Kamei
- Department of Neurosurgery, Tokyo Metropolitan Neurological Hospital, Tokyo, Japan
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Surgery for focal cortical dysplasia in children using intraoperative mapping. Childs Nerv Syst 2014; 30:1839-51. [PMID: 25296545 DOI: 10.1007/s00381-014-2459-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/26/2014] [Accepted: 05/27/2014] [Indexed: 10/24/2022]
Abstract
OBJECTIVE Children with malformation of cortical development represent a significant proportion of pediatric epilepsy surgery candidates. Here, we describe a single-center experience with pediatric patients who underwent surgery for intractable epilepsy due to focal cortical dysplasia (FCD). METHODS Clinical data of 78 patients under 18 years of age with diagnosis of intractable epilepsy due to FCD who underwent surgery from January 1996 to January 2012 were reviewed comparing data of patients submitted to electrocorticography (ECoG) with those without ECoG. RESULTS Patients' mean age at surgery was 8.52 ± 4.99 years; mean age at epilepsy onset was 2.55 ± 3.01 years. Almost 80 % of the patients underwent ECoG register that was essential for delimitation of surgical resection in 66 out of 78 patients. ECoG was performed in all patients with extratemporal lesions, and the most common FCD found was type II. Seizure outcome was similar in groups with or without ECoG. CONCLUSIONS Tailored resection of FCD lesions for intractable epilepsy can be safely performed in children with a good seizure outcome and low complication rate. Epilepsy surgery should be considered for all patients with FCD and refractory epilepsy.
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Tanaka N, Peters JM, Prohl AK, Takaya S, Madsen JR, Bourgeois BF, Dworetzky BA, Hämäläinen MS, Stufflebeam SM. Clinical value of magnetoencephalographic spike propagation represented by spatiotemporal source analysis: correlation with surgical outcome. Epilepsy Res 2013; 108:280-8. [PMID: 24315019 DOI: 10.1016/j.eplepsyres.2013.11.006] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2013] [Revised: 10/05/2013] [Accepted: 11/03/2013] [Indexed: 11/28/2022]
Abstract
OBJECTIVE To investigate the correlation between spike propagation represented by spatiotemporal source analysis of magnetoencephalographic (MEG) spikes and surgical outcome in patients with temporal lobe epilepsy. METHODS Thirty-seven patients were divided into mesial (n=27) and non-mesial (n=10) groups based on the presurgical evaluation. In each patient, ten ipsilateral spikes were averaged, and spatiotemporal source maps of the averaged spike were obtained by using minimum norm estimate. Regions of interest (ROIs) were created including temporoparietal, inferior frontal, mesial temporal, anterior and posterior part of the lateral temporal cortex. We extracted activation values from the source maps and the threshold was set at half of the maximum activation at the peak latency. The leading and propagated areas of the spike were defined as those ROIs with activation reaching the threshold at the earliest and at the peak latencies, respectively. Surgical outcome was assessed based on Engel's classification. Binary variables were created from leading areas (restricted to the anterior and mesial temporal ROIs or not) and from propagation areas (involving the temporoparietal ROI or not), and for surgical outcome (Class I or not). Fisher's exact test was used for significance testing. RESULTS In total and mesial group, restricted anterior/mesial temporal leading areas were correlated with Class I (p<0.05). Temporoparietal propagation was correlated with Class II-IV (p<0.05). For the non-mesial group, no significant relation was found. CONCLUSIONS Spike propagation patterns represented by spatiotemporal source analysis of MEG spikes may provide useful information for prognostic implication in presurgical evaluation of epilepsy.
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Affiliation(s)
- Naoaki Tanaka
- Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, 149 Thirteenth Street, Suite 2301, Charlestown, MA 02129, USA.
| | - Jurriaan M Peters
- Division of Epilepsy and Clinical Neurophysiology, Boston Children's Hospital, 300 Longwood Avenue, Boston, MA 02115, USA
| | - Anna K Prohl
- Division of Epilepsy and Clinical Neurophysiology, Boston Children's Hospital, 300 Longwood Avenue, Boston, MA 02115, USA
| | - Shigetoshi Takaya
- Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, 149 Thirteenth Street, Suite 2301, Charlestown, MA 02129, USA
| | - Joseph R Madsen
- Department of Neurosurgery, Boston Children's Hospital, 300 Longwood Avenue, Boston, MA 02115, USA
| | - Blaise F Bourgeois
- Division of Epilepsy and Clinical Neurophysiology, Boston Children's Hospital, 300 Longwood Avenue, Boston, MA 02115, USA
| | - Barbara A Dworetzky
- Department of Neurology, Brigham and Women's Hospital, 75 Francis Street, Boston, MA 02115, USA
| | - Matti S Hämäläinen
- Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, 149 Thirteenth Street, Suite 2301, Charlestown, MA 02129, USA
| | - Steven M Stufflebeam
- Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, 149 Thirteenth Street, Suite 2301, Charlestown, MA 02129, USA
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Wray CD, McDaniel SS, Saneto RP, Novotny EJ, Ojemann JG. Is postresective intraoperative electrocorticography predictive of seizure outcomes in children? J Neurosurg Pediatr 2012; 9:546-51. [PMID: 22546034 DOI: 10.3171/2012.1.peds11441] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECT Intraoperative electrocorticography (ECoG) is commonly used to guide the extent of resection, especially in lesion-associated intractable epilepsy. Interictal epileptiform discharges on postresective ECoG (post-ECoG) have been predictive of seizure recurrence in some studies, particularly in adults undergoing medial temporal lobectomy, frontal lesionectomy, or low-grade glioma resection. The predictive value of postresective discharges in pediatric epilepsy surgery has not been extensively studied. METHODS The authors retrospectively examined the charts of all 52 pediatric patients who had undergone surgery with post-ECoG and had more than 1 year of follow-up between October 1, 2003, and October 1, 2009. RESULTS Of the 52 pediatric patients, 37 patients showed residual discharges at the end of their resection and 73% of these patients were seizure free, whereas 15 patients had no residual discharges and 60% of them were seizure-free, which was not significantly different (p = 0.36, chi-square). CONCLUSIONS Electrocorticography-guided surgery was associated with excellent postsurgical outcome. Although this sample size was too small to detect a subtle difference, absence of epileptiform discharges on post-ECoG does not appear to predict seizure freedom in all pediatric patients referred for epilepsy surgery. Future studies with larger study samples would be necessary to confirm this finding and determine whether post-ECoG may be useful in some subsets of pediatric epilepsy surgery candidates.
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Affiliation(s)
- Carter D Wray
- Department of Neurology, University of Washington, Seattle, WA, USA.
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The prognostic role of electrocorticography in tailored temporal lobe surgery. Seizure 2011; 20:564-9. [PMID: 21616682 DOI: 10.1016/j.seizure.2011.04.006] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2010] [Revised: 04/04/2011] [Accepted: 04/22/2011] [Indexed: 11/23/2022] Open
Abstract
UNLABELLED Intraoperative electrocorticography (ECoG) has been in clinical use for many decades, yet the validity of this procedure in guiding resective surgery for temporal lobe epilepsy (TLE) is still uncertain, especially in tailored temporal lobectomies in cases of TLE with hippocampal sclerosis. METHODOLOGY Using a case-control design combined with descriptive and comparative analyses we retrospectively evaluated two groups of patients: patients (n=20) who had tailored temporal lobectomies guided by intraoperative ECoG and patients (n=19) who had standard temporal lobectomies without ECoG. Clinical and neuroimaging data, pre- and post-resection ECoG recordings, and seizure-free outcomes were reviewed. RESULTS Of the 20 patients who underwent epilepsy surgery guided by ECoG, pre-resection ECoG studies found spikes both in mesial temporal lobe (MTL) and lateral temporal lobe (LTL) in 10 patients, and restricted to the LTL or MTL in 7 and 3 patients respectively. Postsurgical ECoG captured residual epileptiform activity in only 3 patients, all of whom had MTL and LTL spikes prior to surgery. Postsurgical follow-up at 16.3 (±6.7) months found 15 (75%) patients were seizure free (1A), while 5 (25%) had other outcomes. Analysis found no difference in the proportion of seizure-free outcomes between patients with residual epileptiform activity compared to those without residual epileptiform activity, or between patients who had a tailored resection guided by ECoG and patients who had standard resections without ECoG monitoring. CONCLUSION The patients who underwent tailored temporal lobe epilepsy surgery guided by ECoG had similar outcome compared with the patients with epilepsy surgery not guided by ECoG.
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Luther N, Rubens E, Sethi N, Kandula P, Labar DR, Harden C, Perrine K, Christos PJ, Iorgulescu JB, Lancman G, Schaul NS, Kolesnik DV, Nouri S, Dawson A, Tsiouris AJ, Schwartz TH. The value of intraoperative electrocorticography in surgical decision making for temporal lobe epilepsy with normal MRI. Epilepsia 2011; 52:941-8. [PMID: 21480886 DOI: 10.1111/j.1528-1167.2011.03061.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
PURPOSE We hypothesized that acute intraoperative electrocorticography (ECoG) might identify a subset of patients with magnetic resonance imaging (MRI)-negative temporal lobe epilepsy (TLE) who could proceed directly to standard anteromesial resection (SAMR), obviating the need for chronic electrode implantation to guide resection. METHODS Patients with TLE and a normal MRI who underwent acute ECoG prior to chronic electrode recording of ictal onsets were evaluated. Intraoperative interictal spikes were classified as mesial (M), lateral (L), or mesial/lateral (ML). Results of the acute ECoG were correlated with the ictal-onset zone following chronic ECoG. Onsets were also classified as "M,""L," or "ML." Positron emission tomography (PET), scalp-EEG (electroencephalography), and Wada were evaluated as adjuncts. KEY FINDINGS Sixteen patients fit criteria for inclusion. Outcomes were Engel class I in nine patients, Engel II in two, Engel III in four, and Engel IV in one. Mean postoperative follow-up was 45.2 months. Scalp EEG and PET correlated with ictal onsets in 69% and 64% of patients, respectively. Wada correlated with onsets in 47% of patients. Acute intraoperative ECoG correlated with seizure onsets on chronic ECoG in all 16 patients. All eight patients with "M" pattern ECoG underwent SAMR, and six (75%) experienced Engel class I outcomes. Three of eight patients with "L" or "ML" onsets (38%) had Engel class I outcomes. SIGNIFICANCE Intraoperative ECoG may be useful in identifying a subset of patients with MRI-negative TLE who will benefit from SAMR without chronic implantation of electrodes. These patients have uniquely mesial interictal spikes and can go on to have improved postoperative seizure-free outcomes.
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Affiliation(s)
- Neal Luther
- Department of Neurological Surgery, Weill Cornell Medical College, New York, New York 10065, USA
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Epilepsy. Neurosurgery 2010. [DOI: 10.1007/978-3-540-79565-0_32] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Stefan H, Hopfengärtner R, Kreiselmeyer G, Weigel D, Rampp S, Kerling F, Blümcke I, Buchfelder M. Interictal triple ECoG characteristics of temporal lobe epilepsies: An intraoperative ECoG analysis correlated with surgical outcome. Clin Neurophysiol 2008; 119:642-652. [PMID: 18164665 DOI: 10.1016/j.clinph.2007.11.046] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2007] [Revised: 11/22/2007] [Accepted: 11/23/2007] [Indexed: 11/18/2022]
Abstract
OBJECTIVE Recent reports showed that intraoperative ECoG activities can be analysed with respect to more complex spike patterns. We have systematically investigated different characteristic epileptiform activities in intraoperative ECoG and correlated them to postoperative outcome. METHODS Intraoperative ECoG findings of patients with non-tumorous epilepsies (20 patients with Engel outcome 1a, 20 patients with Engel outcome 2-4) were analysed in order to differentiate ECoG characteristics in temporal lobe epilepsies (TLE). RESULTS In addition to focal spiking with or without propagation, focal slowing in the theta or delta range and so-called ictaform ECoG patterns were found. These ictaform patterns occurred in 40% of the patients with TLE. CONCLUSIONS Leading spikes in combination with focal slowing and ictaform patterns can contribute to a better delineation of mesial temporal epileptic activity in the anterior-posterior alignment. They provide an additional information which can be used for the extent of resection. SIGNIFICANCE If the resected area included the anterior mesial regions, where interictal spikes, ictaform activity and slowing were localized, the postoperative outcome was good.
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Affiliation(s)
- H Stefan
- Epilepsy Center, Department of Neurology, University Hospital Erlangen, Schwabachanlage 6, 91054 Erlangen, Germany.
| | - R Hopfengärtner
- Epilepsy Center, Department of Neurology, University Hospital Erlangen, Schwabachanlage 6, 91054 Erlangen, Germany
| | - G Kreiselmeyer
- Epilepsy Center, Department of Neurology, University Hospital Erlangen, Schwabachanlage 6, 91054 Erlangen, Germany
| | - D Weigel
- Department of Neurosurgery, University Hospital Erlangen, Germany
| | - S Rampp
- Epilepsy Center, Department of Neurology, University Hospital Erlangen, Schwabachanlage 6, 91054 Erlangen, Germany
| | - F Kerling
- Epilepsy Center, Department of Neurology, University Hospital Erlangen, Schwabachanlage 6, 91054 Erlangen, Germany
| | - I Blümcke
- Department of Neuropathology, University Hospital Erlangen, Germany
| | - M Buchfelder
- Department of Neurosurgery, University Hospital Erlangen, Germany
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