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d'Orio P, Squarza S, Revay M, Cardinale F, Castana L, Sartori I, Tassi L, Lo Russo G, Cossu M. Neurological morbidity of surgery for suprasylvian operculoinsular epilepsy. Epilepsia 2024; 65:402-413. [PMID: 38041557 DOI: 10.1111/epi.17844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Revised: 11/22/2023] [Accepted: 11/30/2023] [Indexed: 12/03/2023]
Abstract
OBJECTIVE The objective of this study was to identify risk factors associated with surgery-related neurological morbidity in patients with drug-resistant epilepsy undergoing suprasylvian operculoinsular resections. As secondary outcomes, we also analyzed the risk factors for ischemic lesion (IL) of corona radiata and seizure recurrence. METHODS A retrospective analysis was conducted on a cohort of patients who underwent suprasylvian operculoinsular resections for drug-resistant epilepsy. The association of several presurgical, surgical, and postsurgical factors with both primary (persistent neurological deficits) and secondary (structural abnormalities on postoperative magnetic resonance imaging [MRI] and seizure recurrence) postoperative outcomes was investigated with univariate and multivariate statistical analysis. RESULTS The study included a total of 65 patients; 46.2% of patients exhibited postoperative neurological deficits, but only 12.3% experienced persistent deficits. On postoperative MRI, IL in the corona radiata and corticospinal tract Wallerian degeneration (CSTWd) were seen in 68% and 29% of cases, respectively. Only CSTWd was significantly associated with persistent neurological deficits (relative risk [RR] = 2.6). Combined operculoinsular resection (RR = 3.62) and surgery performed on the left hemisphere (RR = .37) were independently associated with IL in the corona radiata. Variables independently associated with CSTWd were the presence of malacic components in the IL (RR = 1.96), right central operculum resection (RR = 1.79), and increasing age at surgery (RR = 1.03). Sixty-two patients had a postoperative follow-up > 12 months (median = 56, interquartile range = 30.75-73.5), and 62.9% were in Engel class I at last outpatient control. The risk of seizure recurrence was reduced by selective opercular resection (RR = .25) and increased by the histological diagnosis of aspecific gliosis (RR = 1.39). SIGNIFICANCE This study provides insights into the risk factors associated with surgery-related neurological morbidity, as well as further evidence on the postoperative occurrence of subcortical injury and seizure recurrence in epileptic patients undergoing suprasylvian operculoinsular resections. The findings highlighted in this study may be useful to better understand the processes supporting the increased surgical risk in the operculoinsular region.
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Affiliation(s)
- Piergiorgio d'Orio
- "Claudio Munari" Epilepsy Surgery Center, Azienda Socio Sanitaria Territoriale Grande Ospedale Metropolitano Niguarda, Milan, Italy
- Department of Medicine and Surgery, Unit of Neuroscience, University of Parma, Parma, Italy
| | - Silvia Squarza
- Neuroradiology Department, Azienda Socio Sanitaria Territoriale Grande Ospedale Metropolitano Niguarda, Milan, Italy
| | - Martina Revay
- "Claudio Munari" Epilepsy Surgery Center, Azienda Socio Sanitaria Territoriale Grande Ospedale Metropolitano Niguarda, Milan, Italy
- Department of Medicine and Surgery, Unit of Neuroscience, University of Parma, Parma, Italy
| | - Francesco Cardinale
- "Claudio Munari" Epilepsy Surgery Center, Azienda Socio Sanitaria Territoriale Grande Ospedale Metropolitano Niguarda, Milan, Italy
- Department of Medicine and Surgery, Unit of Neuroscience, University of Parma, Parma, Italy
| | - Laura Castana
- "Claudio Munari" Epilepsy Surgery Center, Azienda Socio Sanitaria Territoriale Grande Ospedale Metropolitano Niguarda, Milan, Italy
| | - Ivana Sartori
- "Claudio Munari" Epilepsy Surgery Center, Azienda Socio Sanitaria Territoriale Grande Ospedale Metropolitano Niguarda, Milan, Italy
| | - Laura Tassi
- "Claudio Munari" Epilepsy Surgery Center, Azienda Socio Sanitaria Territoriale Grande Ospedale Metropolitano Niguarda, Milan, Italy
| | - Giorgio Lo Russo
- "Claudio Munari" Epilepsy Surgery Center, Azienda Socio Sanitaria Territoriale Grande Ospedale Metropolitano Niguarda, Milan, Italy
| | - Massimo Cossu
- "Claudio Munari" Epilepsy Surgery Center, Azienda Socio Sanitaria Territoriale Grande Ospedale Metropolitano Niguarda, Milan, Italy
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Papadimitriou-Olivgeris M, Guery B, Ianculescu N, Dunet V, Messaoudi Y, Pistocchi S, Tozzi P, Kirsch M, Monney P. Role of Cerebral Imaging on Diagnosis and Management in Patients With Suspected Infective Endocarditis. Clin Infect Dis 2023; 77:371-379. [PMID: 36999313 PMCID: PMC10425197 DOI: 10.1093/cid/ciad192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Revised: 03/20/2023] [Accepted: 03/29/2023] [Indexed: 04/01/2023] Open
Abstract
BACKGROUND Cerebral embolic events (CEEs) are common complications of infective endocarditis (IE), and their presence can modify diagnosis and therapeutic plans. The aim of the present study was to assess the role of cerebral imaging (Cer-Im) on diagnosis and management of patients with suspected IE. METHODS This study was conducted at the Lausanne University Hospital, Lausanne, Switzerland, from January 2014 to June 2022. CEEs and IE were defined according to modified Duke criteria of the European Society of Cardiology (ESC) guidelines. RESULTS Among 573 patients with IE suspicion and Cer-Im, 239 (42%) patients had neurological symptoms. At least 1 CEE was found in 254 (44%) episodes. Based on Cer-Im findings, episodes were reclassified from rejected to possible or from possible to definite IE in 3 (1%) and 25 (4%) patients, respectively (0% and 2% in asymptomatic patients, respectively). Among the 330 patients with possible or definite IE, at least 1 CEE was found in 187 (57%) episodes. A new surgical indication (in association with left-side vegetation >10 mm) was established in 74/330 (22%) IE patients and 30/155 (19%) asymptomatic IE patients, respectively. CONCLUSIONS Cer-Im in asymptomatic patients with IE suspicion showed limited potential for improving the diagnosis of IE. In contrast, performing Cer-Im in asymptomatic patients with IE may be useful for decision making, because Cer-Im findings led to the establishment of new operative indication for valvular surgery in one fifth of patients according to ESC guidelines.
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Affiliation(s)
| | - Benoit Guery
- Infectious Diseases Service, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Nicoleta Ianculescu
- Department of Cardiology, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Vincent Dunet
- Department of Medical Radiology, Service of Diagnostic and Interventional Radiology, Neuroradiology Unit, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Yosra Messaoudi
- Department of Cardiology, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Silvia Pistocchi
- Department of Medical Radiology, Service of Diagnostic and Interventional Radiology, Neuroradiology Unit, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Piergiorgio Tozzi
- Department of Cardiac Surgery, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Matthias Kirsch
- Department of Cardiac Surgery, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Pierre Monney
- Department of Cardiology, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
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Falsaperla R, Lo Bianco M, Giugno A, Lena G, Sciuto L, Spata F, Guarneri C, Pavone P, Ruggieri M. Neonatal ischemic limb lesions: From etiology to topical nitroglycerine. A case series analysis. Dermatol Ther 2022; 35:e15426. [PMID: 35261118 PMCID: PMC9286834 DOI: 10.1111/dth.15426] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2021] [Revised: 02/06/2022] [Accepted: 03/05/2022] [Indexed: 11/30/2022]
Abstract
Although rare, ischemic lesions in neonates may occur in Neonatal Intensive Care Units (NICUs) secondary to routine procedures and/or medicaments. We present double-center case series, reporting three preterm neonates with ischemic lesions following cardiac arrest and radial blood sampling. The overall outcome after treatment with 2% nitroglycerine (NTG) ointment showed optimal results with no adverse events. The most frequent causes responsible for the onset of such lesions are peripheral arterial catheterization procedures and dopamine extravasation. Our series describe the cardiac arrest as an underestimated cause of onset. Despite the optimal results emerging from the treatment of such lesions with NTG ointment, both in our experience and in the scientific literature, a defined protocol for its use in NICUs is not currently available, hence the need for further studies.
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Affiliation(s)
- Raffaele Falsaperla
- General Pediatrics and Pediatric Acute and Emergency Unit, Policlinico "G. Rodolico-San Marco" University Hospital, University of Catania, Catania, Italy.,Neonatal Intensive Care Unit, Policlinico "G. Rodolico-San Marco" University Hospital, University of Catania, Catania, Italy
| | - Manuela Lo Bianco
- Post Graduate Programme in Paediatrics, Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy
| | - Andrea Giugno
- Post Graduate Programme in Paediatrics, Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy
| | - Germana Lena
- Post Graduate Programme in Paediatrics, Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy
| | - Laura Sciuto
- Post Graduate Programme in Paediatrics, Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy
| | - Francesco Spata
- Neonatal Intensive Care Unit, "Giovanni Paolo II" Hospital, Ragusa, Italy
| | - Claudio Guarneri
- Department of Biomedical and Dental Sciences and Morphofunctional Imaging, Section of Dermatology, A.O.U.P. "Gaetano Martino", University of Messina, Messina, Italy
| | - Piero Pavone
- Department of Clinical and Experimental Medicine, Section of Pediatrics and Child Neuropsychiatry, University of Catania, Catania, Italy
| | - Martino Ruggieri
- Unit of Rare Diseases of the Nervous System in Childhood, Department of Clinical and Experimental Medicine, Section of Pediatrics and Child Neuropsychiatry, University of Catania, Catania, Italy
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Ponirakis G, Elsotouhy A, Al Hamad H, Vattoth S, Petropoulos IN, Khan A, Gad H, Al-Khayat F, Chandran M, Ramadan M, Elorrabi M, Gadelseed M, Tosino R, Gawhale PV, Alobaidi M, Khan S, Manikoth P, Abdelrahim YHM, Thodi N, Almuhannadi H, Al-Mohannadi S, AlMarri F, Qazi M, Own A, Mahfoud ZR, Shuaib A, Malik RA. Association of Cerebral Ischemia With Corneal Nerve Loss and Brain Atrophy in MCI and Dementia. Front Neurosci 2021; 15:690896. [PMID: 34234643 PMCID: PMC8257078 DOI: 10.3389/fnins.2021.690896] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2021] [Accepted: 05/31/2021] [Indexed: 11/13/2022] Open
Abstract
Introduction This study assessed the association of cerebral ischemia with neurodegeneration in mild cognitive impairment (MCI) and dementia. Methods Subjects with MCI, dementia and controls underwent assessment of cognitive function, severity of brain ischemia, MRI brain volumetry and corneal confocal microscopy. Results Of 63 subjects with MCI (n = 44) and dementia (n = 19), 11 had no ischemia, 32 had subcortical ischemia and 20 had both subcortical and cortical ischemia. Brain volume and corneal nerve measures were comparable between subjects with subcortical ischemia and no ischemia. However, subjects with subcortical and cortical ischemia had a lower hippocampal volume (P < 0.01), corneal nerve fiber length (P < 0.05) and larger ventricular volume (P < 0.05) compared to those with subcortical ischemia and lower corneal nerve fiber density (P < 0.05) compared to those without ischemia. Discussion Cerebral ischemia was associated with cognitive impairment, brain atrophy and corneal nerve loss in MCI and dementia.
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Affiliation(s)
- Georgios Ponirakis
- Department of Medicine, Weill Cornell Medicine-Qatar, Qatar Foundation, Doha, Qatar.,Faculty of Science and Engineering, Manchester Metropolitan University, Manchester, United Kingdom
| | - Ahmed Elsotouhy
- Department of Medicine, Weill Cornell Medicine-Qatar, Qatar Foundation, Doha, Qatar.,Neuroradiology, Hamad General Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Hanadi Al Hamad
- Geriatric and Memory Clinic, Rumailah Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Surjith Vattoth
- Department of Radiology, University of Arkansas for Medical Sciences, Little Rock, AR, United States
| | | | - Adnan Khan
- Department of Medicine, Weill Cornell Medicine-Qatar, Qatar Foundation, Doha, Qatar
| | - Hoda Gad
- Department of Medicine, Weill Cornell Medicine-Qatar, Qatar Foundation, Doha, Qatar
| | - Fatima Al-Khayat
- Department of Medicine, Weill Cornell Medicine-Qatar, Qatar Foundation, Doha, Qatar
| | - Mani Chandran
- Geriatric and Memory Clinic, Rumailah Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Marwan Ramadan
- Geriatric and Memory Clinic, Rumailah Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Marwa Elorrabi
- Geriatric and Memory Clinic, Rumailah Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Masharig Gadelseed
- Geriatric and Memory Clinic, Rumailah Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Rhia Tosino
- Geriatric and Memory Clinic, Rumailah Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Priya V Gawhale
- Geriatric and Memory Clinic, Rumailah Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Maryam Alobaidi
- Geriatric and Memory Clinic, Rumailah Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Shafi Khan
- Geriatric and Memory Clinic, Rumailah Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Pravija Manikoth
- Geriatric and Memory Clinic, Rumailah Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Yasmin H M Abdelrahim
- Geriatric and Memory Clinic, Rumailah Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Noushad Thodi
- Magnetic Resonance Imaging Unit, Rumailah Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Hamad Almuhannadi
- Department of Medicine, Weill Cornell Medicine-Qatar, Qatar Foundation, Doha, Qatar
| | - Salma Al-Mohannadi
- Department of Medicine, Weill Cornell Medicine-Qatar, Qatar Foundation, Doha, Qatar
| | - Fatema AlMarri
- Department of Medicine, Weill Cornell Medicine-Qatar, Qatar Foundation, Doha, Qatar
| | - Murtaza Qazi
- Department of Medicine, Weill Cornell Medicine-Qatar, Qatar Foundation, Doha, Qatar
| | - Ahmed Own
- Neuroradiology, Hamad General Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Ziyad R Mahfoud
- Department of Medicine, Weill Cornell Medicine-Qatar, Qatar Foundation, Doha, Qatar
| | - Ashfaq Shuaib
- Department of Medicine, University of Alberta, Edmonton, AB, Canada
| | - Rayaz A Malik
- Department of Medicine, Weill Cornell Medicine-Qatar, Qatar Foundation, Doha, Qatar.,Faculty of Science and Engineering, Manchester Metropolitan University, Manchester, United Kingdom.,Institute of Cardiovascular Science, University of Manchester, Manchester, United Kingdom
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Araújo T, Maia R, Massano J, Mendonça L, Guimarães J. From Kidney to Brain: An Uncommon Severe Relapse of Myeloperoxidase Anti-Neutrophil Cytoplasmic Antibody (MPO-ANCA) Vasculitis. Cureus 2021; 13:e14205. [PMID: 33936909 PMCID: PMC8086049 DOI: 10.7759/cureus.14205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Anti-neutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV) is a group of rare autoimmune diseases that affect medium and small blood vessels, with uncommon, variable central nervous system (CNS) involvement. It poses diagnosis challenges due to the limited accuracy of conventional imaging and vast differential diagnosis. We describe the case of a 76-year-old man with a previously diagnosed myeloperoxidase (MPO)-positive AAV with exclusive renal involvement. The patient presented to our emergency department (ED) with sudden-onset weakness of the right side of the body, difficulty speaking, fever, and a history of progressive cognitive impairment in the previous three months (loss of memory, time and space disorientation, acalculia). Brain imaging showed multiple acute and subacute ischemic lesions, suggesting CNS vasculitic involvement. The patient was treated with methylprednisolone pulses, followed by rituximab, with motor and cognitive improvement. Timely diagnosis and adequate treatment of AAV as a cause for new-onset neurological symptoms are crucial to improve outcomes. Otherwise, a higher risk of relapse remains, and extensive neurological deficits may become permanent. Evidence regarding the best treatment options in these patients is scarce and case reports provide further data on this topic.
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Affiliation(s)
- Tiago Araújo
- Department of Internal Medicine, Unidade Local de Saúde do Litoral Alentejano, Santiago do Cacém, PRT.,Department of Neurology, Centro Hospitalar Universitário de São João, Porto, PRT
| | - Rúben Maia
- Department of Neuroradiology, Centro Hospitalar Universitário de São João, Porto, PRT
| | - João Massano
- Department of Neurology, Centro Hospitalar Universitário de São João, Porto, PRT.,Department of Clinical Neurosciences and Mental Health, Faculdade de Medicina da Universidade do Porto, Porto, PRT
| | - Luis Mendonça
- Department of Nephrology, Centro Hospitalar Universitário de São João, Porto, PRT
| | - Joana Guimarães
- Department of Neurology, Centro Hospitalar Universitário de São João, Porto, PRT.,Department of Clinical Neurosciences and Mental Health, Faculdade de Medicina da Universidade do Porto, Porto, PRT
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Abstract
Acute mesenteric ischemia (AMI) is one of the most severe diagnostic and therapeutic vital emergencies. This affection is characterized by the insufficient blood supply to the gastrointestinal tract, related to an occlusive or non-occlusive mechanism, resulting in an ischemic and inflammatory injury that may progress to necrosis of the intestinal wall. The clinical picture is nonspecific, dominated by acute abdominal pain. At present, no early biological marker is commonly used in clinical practice for diagnostic purposes. The purpose of this review was to review the markers that have been evaluated in this condition. Among the biological blood markers which have shown a diagnostic interest in the IMA, there are notably the two stereoisomers of lactate (D and L), D-dimers, and alpha glutathione transferase. More specific markers include the intestinal fatty acid binding protein or I-FABP, which is a marker of enterocyte necrosis, citrulline, a marker of enterocyte mass, or Smooth muscle protein 22 (SM22) marker for muscle damage. The early diagnosis of intestinal ischemia remains a challenge. It is likely that in the future IMA's biomarker research will be better customized and adapted to the physiopathological mechanism. More global approaches (proteomics, metabolomics) should also make it possible to identify new biomarkers.
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Bouthillier A, Weil AG, Martineau L, Létourneau-Guillon L, Nguyen DK. Operculoinsular cortectomy for refractory epilepsy. Part 2: Is it safe? J Neurosurg 2019; 133:1-11. [PMID: 31597116 DOI: 10.3171/2019.6.jns191126] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2019] [Accepted: 06/18/2019] [Indexed: 11/06/2022]
Abstract
OBJECTIVE Operculoinsular cortectomy (also termed operculoinsulectomy) is increasingly recognized as a therapeutic option for perisylvian refractory epilepsy. However, most neurosurgeons are reluctant to perform the technique because of previously experienced or feared neurological complications. The goal of this study was to quantify the incidence of basic neurological complications (loss of primary nonneuropsychological functions) associated with operculoinsular cortectomies for refractory epilepsy, and to identify factors predicting these complications. METHODS Clinical, imaging, and surgical data of all patients investigated and surgically treated by our team for refractory epilepsy requiring an operculoinsular cortectomy were retrospectively reviewed. Patients with tumors and encephalitis were excluded. Logistic regression analysis was used for uni- and multivariate statistical analyses. RESULTS Forty-four operculoinsular cortectomies were performed in 43 patients. Although postoperative neurological deficits were frequent (54.5% of procedures), only 3 procedures were associated with a permanent significant neurological deficit. Out of the 3 permanent deficits, only 1 (2.3%; a sensorimotor hemisyndrome) was related to the technique of operculoinsular cortectomy (injury to a middle cerebral artery branch), while the other 2 (arm hypoesthesia and hemianopia) were attributed to cortical resection beyond the operculoinsular area. With multivariate analysis, a postoperative neurological deficit was associated with preoperative insular hypometabolism on PET scan. Postoperative motor deficit (29.6% of procedures) was correlated with fewer years of neurosurgical experience and frontal operculectomies, but not with corona radiata ischemic lesions. Ischemic lesions in the posterior two-thirds of the corona radiata (40.9% of procedures) were associated with parietal operculectomies, but not with posterior insulectomies. CONCLUSIONS Operculoinsular cortectomy for refractory epilepsy is a relatively safe therapeutic option but temporary neurological deficits after surgery are frequent. This study highlights the role of frontal/parietal opercula resections in postoperative complications. Corona radiata ischemic lesions are not clearly related to motor deficits. There were no obvious permanent neurological consequences of losing a part of an epileptic insula, including on the dominant side for language. A low complication rate can be achieved if the following conditions are met: 1) microsurgical technique is applied to spare cortical branches of the middle cerebral artery; 2) the resection of an opercula is done only if the opercula is part of the epileptic focus; and 3) the neurosurgeon involved has proper training and experience.
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Affiliation(s)
| | - Alexander G Weil
- 1Divisions of Neurosurgery
- 4Division of Neurosurgery, Sainte-Justine University Hospital Center, Montreal, Quebec, Canada
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Teng E, Stefanacci L, Squire LR, Zola SM. Contrasting effects on discrimination learning after hippocampal lesions and conjoint hippocampal-caudate lesions in monkeys. J Neurosci 2000; 20:3853-63. [PMID: 10804225 PMCID: PMC6772685] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023] Open
Abstract
Eighteen monkeys with lesions of the hippocampal region (the hippocampus proper, the dentate gyrus, and the subiculum) made by an ischemic procedure, radio frequency, or ibotenic acid were tested on a simple, two-choice object discrimination learning task that has been shown to be sensitive to large lesions of the medial temporal lobe. The monkeys were also tested on two other discrimination tasks (pattern discrimination and eight-pair concurrent discrimination) that can be learned normally by monkeys with large medial temporal lobe lesions. All of the lesion groups were impaired at learning the simple object discrimination task. Seven of the monkeys who had sustained damage to the hippocampal region also sustained damage to the tail of the caudate nucleus. These seven monkeys, but not the other 11 monkeys with hippocampal lesions, were impaired on pattern discrimination and concurrent discrimination learning. The results suggest that the hippocampal region is important for learning easy, two-choice discriminations, whereas the caudate nucleus is necessary for the normal learning of more difficult, gradually acquired discrimination tasks. The findings support the distinction between declarative memory, which depends on the hippocampus and related medial temporal lobe structures, and habit learning, which depends on the caudate nucleus.
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Affiliation(s)
- E Teng
- Veterans Affairs Medical Center, San Diego, California 92161, and Departments of Psychiatry, Neurosciences, and Psychology, University of California, La Jolla 92093, USA
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Zola SM, Squire LR, Teng E, Stefanacci L, Buffalo EA, Clark RE. Impaired recognition memory in monkeys after damage limited to the hippocampal region. J Neurosci 2000; 20:451-63. [PMID: 10627621 PMCID: PMC6774137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023] Open
Abstract
Monkeys with lesions limited to the hippocampal region (the hippocampus proper, the dentate gyrus, and the subiculum) were impaired on two tasks of recognition memory: delayed nonmatching to sample and the visual paired-comparison task. Recognition memory was impaired in five different groups of monkeys, whether the lesions were made by an ischemic procedure, by radio frequency, or by ibotenic acid. The finding that the hippocampal region is essential for normal recognition memory performance is considered in the context of current ideas about the role of the hippocampus in declarative memory.
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Affiliation(s)
- S M Zola
- Veterans Affairs Medical Center, San Diego, California 92126, USA.
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