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Castro‐Lima H, Passarelli V, Ribeiro ES, Adda CC, Preturlon‐Santos APP, Jorge CL, Valério R, Tzu WH, Boa‐Sorte N, Pipek LZ, Castro LHM. Bilateral ictal EEG is associated with better memory outcome after hippocampal sclerosis surgery. Epilepsia Open 2023; 8:1532-1540. [PMID: 37750472 PMCID: PMC10690677 DOI: 10.1002/epi4.12834] [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: 01/18/2023] [Accepted: 09/17/2023] [Indexed: 09/27/2023] Open
Abstract
OBJECTIVE To compare memory outcomes after surgery for unilateral hippocampal sclerosis (HS)-associated epilepsy in patients with unilateral and bilateral ictal electrographic involvement. METHODS We prospectively evaluated HS patients, aged 18-55 years and IQ ≥70. Left (L) and right (R) surgical groups underwent noninvasive video-EEG monitoring and Wada test. We classified patients as Ipsilateral if ictal EEG was restricted to the HS side, or Bilateral, if at least one seizure onset occurred contralaterally to the HS, or if ictal discharge evolved to the opposite temporal region. Patients who declined surgery served as controls. Memory was evaluated on two occasions with Rey Auditory-Verbal Learning Test and Rey Visual-Design Learning Test. Baseline neuropsychological test scores were compared between groups. Pre- and postoperative scores were compared within each group. Reliable change index Z-scores (RCI) were obtained using controls as references, and compared between surgical groups. RESULTS We evaluated 64 patients. Patients were classified as: L-Ipsilateral (9), L-Bilateral (15), L-Control (9), R-Ipsilateral (10), R-Bilateral (9), and R-Control (12). On preoperative evaluation, memory performance did not differ among surgical groups. Right HS patients did not present postoperative memory decline. L-Ipsilateral group presented postoperative decline on immediate (P = 0.036) and delayed verbal recall (P = 0.011), while L-Bilateral did not decline. L-Ipsilateral had lower RCI Z-scores, indicating delayed verbal memory decline compared to L-Bilateral (P = 0.012). SIGNIFICANCE Dominant HS patients with bilateral ictal involvement presented less pronounced postoperative verbal memory decline compared to patients with exclusive ipsilateral ictal activity. Surgery was indicated in these patients regardless of memory impairment on neuropsychological testing, since resection of the left sclerotic hippocampus could result in cessation of contralateral epileptiform activity, and, therefore, improved memory function.
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Affiliation(s)
| | - Valmir Passarelli
- Department of Neurology, Hospital das Clínicas HCFMUSP, Faculdade de MedicinaUniversity of Sao PauloSão PauloBrazil
| | - Elyse S Ribeiro
- Division of Psychology, Hospital das Clínicas HCFMUSP, Faculdade de MedicinaUniversity of Sao PauloSão PauloBrazil
| | - Carla C Adda
- Division of Psychology, Hospital das Clínicas HCFMUSP, Faculdade de MedicinaUniversity of Sao PauloSão PauloBrazil
| | - Ana Paula P Preturlon‐Santos
- Department of Neurology, Hospital das Clínicas HCFMUSP, Faculdade de MedicinaUniversity of Sao PauloSão PauloBrazil
| | - Carmen L Jorge
- Department of Neurology, Hospital das Clínicas HCFMUSP, Faculdade de MedicinaUniversity of Sao PauloSão PauloBrazil
| | - Rosa Valério
- Department of Neurology, Hospital das Clínicas HCFMUSP, Faculdade de MedicinaUniversity of Sao PauloSão PauloBrazil
| | - Wen Hung Tzu
- Department of Neurosurgery, Hospital das Clínicas HCFMUSP, Faculdade de MedicinaUniversity of Sao PauloSão PauloBrazil
| | - Ney Boa‐Sorte
- Bahiana School of Medicine and Public HealthSalvadorBrazil
| | - Leonardo Zumerkorn Pipek
- Department of Neurology, Hospital das Clínicas HCFMUSP, Faculdade de MedicinaUniversity of Sao PauloSão PauloBrazil
| | - Luiz Henrique M Castro
- Department of Neurology, Hospital das Clínicas HCFMUSP, Faculdade de MedicinaUniversity of Sao PauloSão PauloBrazil
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Abdulrazeq HF, Kimata AR, Shao B, Svokos K, Ayub N, Nie D, Asaad WF. Laser amygdalohippocampotomy reduces contralateral hippocampal sub-clinical activity in bitemporal epilepsy: A case illustration of responsive neurostimulator ambulatory recordings. Epilepsy Behav Rep 2023; 25:100636. [PMID: 38162813 PMCID: PMC10755529 DOI: 10.1016/j.ebr.2023.100636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Revised: 11/29/2023] [Accepted: 11/30/2023] [Indexed: 01/03/2024] Open
Abstract
Responsive neurostimulation (RNS) is a valuable tool in the diagnosis and treatment of medication refractory epilepsy (MRE) and provides clinicians with better insights into patients' seizure patterns. In this case illustration, we present a patient with bilateral hippocampal RNS for presumed bilateral mesial temporal lobe epilepsy. The patient subsequently underwent a right sided LITT amygdalohippocampotomy based upon chronic RNS data revealing predominance of seizures from that side. Analyzing electrocorticography (ECOG) from the RNS system, we identified the frequency of high amplitude discharges recorded from the left hippocampal lead pre- and post- right LITT amygdalohippocampotomy. A reduction in contralateral interictal epileptiform activity was observed through RNS recordings over a two-year period, suggesting the potential dependency of the contralateral activity on the primary epileptogenic zone. These findings suggest that early targeted surgical resection or laser ablation by leveraging RNS data can potentially impede the progression of dependent epileptiform activity and may aid in preserving neurocognitive networks. RNS recordings are essential in shaping further management decisions for our patient with a presumed bitemporal epilepsy.
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Affiliation(s)
- Hael F. Abdulrazeq
- Department of Neurosurgery, Rhode Island Hospital, Providence, RI, United States
- The Warren Alpert Medical School of Brown University, Providence, RI, United States
| | - Anna R. Kimata
- Department of Neurosurgery, Rhode Island Hospital, Providence, RI, United States
- The Warren Alpert Medical School of Brown University, Providence, RI, United States
- Department of Neuroscience, Brown University, Providence, RI, United States
| | - Belinda Shao
- Department of Neurosurgery, Rhode Island Hospital, Providence, RI, United States
- The Warren Alpert Medical School of Brown University, Providence, RI, United States
| | - Konstantina Svokos
- Department of Neurosurgery, Rhode Island Hospital, Providence, RI, United States
- The Warren Alpert Medical School of Brown University, Providence, RI, United States
- Norman Prince Neurosciences Institute, Rhode Island Hospital & Hasbro Children’s Hospital, Providence, RI, United States
- Department of Neuroscience, Brown University, Providence, RI, United States
| | - Neishay Ayub
- The Warren Alpert Medical School of Brown University, Providence, RI, United States
- Norman Prince Neurosciences Institute, Rhode Island Hospital & Hasbro Children’s Hospital, Providence, RI, United States
- Department of Neurology, Rhode Island Hospital, Providence, RI, United States
| | - Duyu Nie
- The Warren Alpert Medical School of Brown University, Providence, RI, United States
- Norman Prince Neurosciences Institute, Rhode Island Hospital & Hasbro Children’s Hospital, Providence, RI, United States
- Department of Neurology, Rhode Island Hospital, Providence, RI, United States
| | - Wael F. Asaad
- Department of Neurosurgery, Rhode Island Hospital, Providence, RI, United States
- The Warren Alpert Medical School of Brown University, Providence, RI, United States
- Norman Prince Neurosciences Institute, Rhode Island Hospital & Hasbro Children’s Hospital, Providence, RI, United States
- Department of Neuroscience, Brown University, Providence, RI, United States
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Lucas A, Nanga RPR, Hadar P, Chen S, Gibson A, Oechsel K, Elliott MA, Stein JM, Das S, Reddy R, Detre JA, Davis KA. Mapping hippocampal glutamate in mesial temporal lobe epilepsy with glutamate weighted CEST (GluCEST) imaging. Hum Brain Mapp 2022; 44:549-558. [PMID: 36173151 PMCID: PMC9842879 DOI: 10.1002/hbm.26083] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Revised: 08/18/2022] [Accepted: 08/29/2022] [Indexed: 01/25/2023] Open
Abstract
Temporal lobe epilepsy (TLE) is one of the most common subtypes of focal epilepsy, with mesial temporal sclerosis (MTS) being a common radiological and histopathological finding. Accurate identification of MTS during presurgical evaluation confers an increased chance of good surgical outcome. Here we propose the use of glutamate-weighted chemical exchange saturation transfer (GluCEST) magnetic resonance imaging (MRI) at 7 Tesla for mapping hippocampal glutamate distribution in epilepsy, allowing to differentiate lesional from non-lesional mesial TLE. We demonstrate that a directional asymmetry index, which quantifies the relative difference between GluCEST contrast in hippocampi ipsilateral and contralateral to the seizure onset zone, can differentiate between sclerotic and non-sclerotic hippocampi, even in instances where traditional presurgical MRI assessments did not provide evidence of sclerosis. Overall, our results suggest that hippocampal glutamate mapping through GluCEST imaging is a valuable addition to the presurgical epilepsy evaluation toolbox.
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Affiliation(s)
- Alfredo Lucas
- Department of BioengineeringUniversity of PennsylvaniaPhiladelphiaPennsylvaniaUSA,University of Pennsylvania Perelman School of MedicinePhiladelphiaPennsylvaniaUSA
| | - Ravi Prakash Reddy Nanga
- Center for Advanced Metabolic Imaging in Precision MedicineUniversity of Pennsylvania Perelman School of MedicinePhiladelphiaPennsylvaniaUSA
| | - Peter Hadar
- University of Pennsylvania Perelman School of MedicinePhiladelphiaPennsylvaniaUSA,Department of NeurologyUniversity of Pennsylvania Perelman School of MedicinePhiladelphiaPennsylvaniaUSA
| | - Stephanie Chen
- Department of Neurology (work conducted while at the University of Pennsylvania)University of Maryland School of MedicinePhiladelphiaPennsylvaniaUSA
| | - Adam Gibson
- Virginia Commonwealth University School of Medicine (work conducted while at the University of Pennsylvania)PhiladelphiaPennsylvaniaUSA
| | - Kelly Oechsel
- Wake Forest University School of Medicine (work conducted while at the University of Pennsylvania)PhiladelphiaPennsylvaniaUSA
| | - Mark A. Elliott
- Center for Advanced Metabolic Imaging in Precision MedicineUniversity of Pennsylvania Perelman School of MedicinePhiladelphiaPennsylvaniaUSA
| | - Joel M. Stein
- Department of RadiologyUniversity of Pennsylvania Perelman School of MedicinePhiladelphiaPennsylvaniaUSA
| | - Sandhitsu Das
- Department of NeurologyUniversity of Pennsylvania Perelman School of MedicinePhiladelphiaPennsylvaniaUSA
| | - Ravinder Reddy
- Center for Advanced Metabolic Imaging in Precision MedicineUniversity of Pennsylvania Perelman School of MedicinePhiladelphiaPennsylvaniaUSA
| | - John A. Detre
- Center for Advanced Metabolic Imaging in Precision MedicineUniversity of Pennsylvania Perelman School of MedicinePhiladelphiaPennsylvaniaUSA,Department of NeurologyUniversity of Pennsylvania Perelman School of MedicinePhiladelphiaPennsylvaniaUSA,Department of RadiologyUniversity of Pennsylvania Perelman School of MedicinePhiladelphiaPennsylvaniaUSA
| | - Kathryn A. Davis
- Department of BioengineeringUniversity of PennsylvaniaPhiladelphiaPennsylvaniaUSA,Department of NeurologyUniversity of Pennsylvania Perelman School of MedicinePhiladelphiaPennsylvaniaUSA
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Li W, Jiang Y, Qin Y, Zhou B, Lei D, Zhang H, Lei D, Yao D, Luo C, Gong Q, Zhou D, An D. Structural and functional reorganization of contralateral hippocampus after temporal lobe epilepsy surgery. NEUROIMAGE-CLINICAL 2021; 31:102714. [PMID: 34102537 PMCID: PMC8187253 DOI: 10.1016/j.nicl.2021.102714] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/06/2021] [Revised: 05/27/2021] [Accepted: 05/28/2021] [Indexed: 02/08/2023]
Abstract
Postoperative changes of contralateral hippocampus in temporal lobe epilepsy. No obvious hippocampal volume change was observed after successful surgery. Surgical manipulation may lead to a transient functional connectivity reduction. Increased functional connectivity mostly involved bilateral frontal regions.
Objective To explore the structural and functional reorganization of contralateral hippocampus in patients with unilateral mesial temporal lobe epilepsy (mTLE) who achieved seizure-freedom after anterior temporal lobectomy (ATL). Methods We obtained high-resolution structural MRI and resting-state functional MRI data in 28 unilateral mTLE patients and 29 healthy controls. Patients were scanned before and three and 24 months after surgery while controls were scanned only once. Hippocampal gray matter volume (GMV) and functional connectivity (FC) were assessed. Results No obvious GMV changes were observed in contralateral hippocampus before and after successful surgery. Before surgery, ipsilateral hippocampus showed increased FC with ipsilateral insula (INS) and temporoparietal junction (TPJ), but decreased FC with widespread bilateral regions, as well as contralateral hippocampus. After successful ATL, contralateral hippocampus showed: (1) decreased FC with ipsilateral INS at three months follow-up, without further changes; (2) decreased FC with ipsilateral TPJ, postcentral gyrus and rolandic operculum at three months, with an obvious increase at 24 months follow-up; (3) increased FC with bilateral medial prefrontal cortex (MPFC) and superior frontal gyrus (SFG) at three months follow-up, without further changes. Conclusions Successful ATL may not lead to an obvious structural reorganization in contralateral hippocampus. Surgical manipulation may lead to a transient FC reduction of contralateral hippocampus. Increased FC between contralateral hippocampus and bilateral MPFC and SFG may be related to postoperative functional remodeling.
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Affiliation(s)
- Wei Li
- Department of Neurology, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Yuchao Jiang
- The Clinical Hospital of Chengdu Brain Science Institute, MOE Key Lab for Neuroinformation, Center for Information in Medicine, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, Sichuan, China
| | - Yingjie Qin
- Department of Neurology, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Baiwan Zhou
- Huaxi MR Research Center, Department of Radiology, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Du Lei
- Huaxi MR Research Center, Department of Radiology, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Heng Zhang
- Department of Neurosurgery, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Ding Lei
- Department of Neurosurgery, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Dezhong Yao
- The Clinical Hospital of Chengdu Brain Science Institute, MOE Key Lab for Neuroinformation, Center for Information in Medicine, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, Sichuan, China
| | - Cheng Luo
- The Clinical Hospital of Chengdu Brain Science Institute, MOE Key Lab for Neuroinformation, Center for Information in Medicine, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, Sichuan, China
| | - Qiyong Gong
- Huaxi MR Research Center, Department of Radiology, West China Hospital, Sichuan University, Chengdu, Sichuan, China.
| | - Dong Zhou
- Department of Neurology, West China Hospital, Sichuan University, Chengdu, Sichuan, China.
| | - Dongmei An
- Department of Neurology, West China Hospital, Sichuan University, Chengdu, Sichuan, China.
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