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Lara FR, Sunkavalli P, Mikaelian M, Golemb B, Chung DY, Duhaime AC, Staley K, Costine-Bartell B. Brief apnea with hypoventilation reduces seizure duration and shifts seizure location for several hours in a model of severe traumatic brain injury. Epilepsia 2024; 65:2099-2110. [PMID: 38752982 PMCID: PMC11251852 DOI: 10.1111/epi.17993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2023] [Revised: 04/09/2024] [Accepted: 04/09/2024] [Indexed: 07/17/2024]
Abstract
OBJECTIVE Seizures can be difficult to control in infants and toddlers. Seizures with periods of apnea and hypoventilation are common following severe traumatic brain injury (TBI). We previously observed that brief apnea with hypoventilation (A&H) in our severe TBI model acutely interrupted seizures. The current study is designed to determine the effect of A&H on subsequent seizures and whether A&H has potential therapeutic implications. METHODS Piglets (1 week or 1 month old) received multifactorial injuries: cortical impact, mass effect, subdural hematoma, subarachnoid hemorrhage, and seizures induced with kainic acid. A&H (1 min apnea, 10 min hypoventilation) was induced either before or after seizure induction, or control piglets received subdural/subarachnoid hematoma and seizure without A&H. In an intensive care unit, piglets were sedated, intubated, and mechanically ventilated, and epidural electroencephalogram was recorded for an average of 18 h after seizure induction. RESULTS In our severe TBI model, A&H after seizure reduced ipsilateral seizure burden by 80% compared to the same injuries without A&H. In the A&H before seizure induction group, more piglets had exclusively contralateral seizures, although most piglets in all groups had seizures that shifted location throughout the several hours of seizure. After 8-10 h, seizures transitioned to interictal epileptiform discharges regardless of A&H or timing of A&H. SIGNIFICANCE Even brief A&H may alter traumatic seizures. In our preclinical model, we will address the possibility of hypercapnia with normoxia, with controlled intracranial pressure, as a therapeutic option for children with status epilepticus after hemorrhagic TBI.
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Affiliation(s)
| | | | - Michael Mikaelian
- Department of Neurosurgery, Massachusetts General Hospital, Boston, MA
| | - Bryan Golemb
- Department of Neurosurgery, Massachusetts General Hospital, Boston, MA
| | - David Y. Chung
- Neurovascular Research Unit, Massachusetts General Hospital, Boston, MA
- Department of Neurology, Massachusetts General Hospital, Boston, MA
- Department of Neurology, Harvard Medical School, Boston, MA
| | - Ann-Christine Duhaime
- Department of Neurosurgery, Massachusetts General Hospital, Boston, MA
- Department of Neurosurgery, Harvard Medical School, Boston, MA
| | - Kevin Staley
- Department of Neurology, Massachusetts General Hospital, Boston, MA
- Department of Neurology, Harvard Medical School, Boston, MA
| | - Beth Costine-Bartell
- Department of Neurosurgery, Massachusetts General Hospital, Boston, MA
- Department of Neurosurgery, Harvard Medical School, Boston, MA
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Hochstetler A, Price G, Baohan A, Li M, Rodriguez Lara F, Lok J, Costine-Bartell B. Developmental regulation of matrix metalloproteinases in response to multi-factorial, severe TBI injuries during immaturity. Dev Neurosci 2024:000536054. [PMID: 38190820 PMCID: PMC11228128 DOI: 10.1159/000536054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Accepted: 12/22/2023] [Indexed: 01/10/2024] Open
Abstract
INTRODUCTION A striking pattern in young children after severe TBI is when the entire cortical ribbon displays tissue damage: hemispheric hypodensity (HH). HH is often a result of abusive head trauma (AHT). We previously reported a model of HH in a gyrencephalic species where a combination of injuries consisting of 1) cortical impact, 2) midline shift, 3) subdural hematoma/subarachnoid hemorrhage, 4) traumatic seizures, and 5) brief apnea and hypoventilation, resulted in extensive, hypoxic-ischemic type injury. Importantly, this mechanism closely resembles that seen in children, with relative sparing of the contralateral cortex, thus, ruling out a pure asphyxia mechanism. In this model, piglets of similar developmental stage to human toddlers (postnatal day 30, PND30) have extensive hypoxic-ischemic damage to the cortical ribbon with sparing of the contralateral hemisphere and deep gray matter areas. However, piglets of similar developmental stage to human infants (postnatal day 7, PND7) have less hypoxic-ischemic damage that is notably bilateral and patchy. We therefore sought to discover whether the extensive tissue damage observed in PND30 was due to a greater upregulation of matrix metalloproteinases (MMPs). MATERIALS AND METHODS In PND 7 or PND 30 piglets receiving AHT injuries (cortical impact, midline shift, subdural hematoma/subarachnoid hemorrhage, traumatic seizures, and brief apnea and hypoventilation) or a sham injury, the pattern of albumin extravasation and MMP-9 upregulation throughout the brain was determined via immunohistochemistry, brain tissue adjacent to the cortical impact where the tissue damage spreads was collected for Western blots, and the gelatinase activity was determined over time in peripheral plasma. EEG was recorded and piglets survived up to 24 hours after injury administration. RESULTS The pattern of albumin extravasation, indicating vasogenic edema, as well as increase in MMP-9, were both present at the same areas of hypoxic-ischemic tissue damage. Evidence from immunohistochemistry, western blot, and zymogens demonstrate that MMP- 2,- 3 or -9 are constitutively expressed during immaturity and are not different between developmental stages; however, active forms are upregulated in PND30 but not PND7 after in response to AHT model injuries. Furthermore, peripheral active MMP-9 was downregulated after model injuries in PND7. CONCLUSIONS This differential response to AHT model injuries might confer protection to the PND7 brain. Additionally, we find that immature gyrencephalic species have a greater baseline and array of MMP's than previously demonstrated in rodent species. Treatment with an oral or intravenous broad-spectrum matrix metalloproteinase inhibitor might reduce the extensive spread of injury in PND30, but the exposure to metalloproteinase inhibitors must be acute as to not interfere with the homeostatic role of matrix metalloproteinases in normal postnatal brain development and plasticity as well as post-injury synaptogenesis and tissue repair.
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Costine-Bartell BA, Martinez-Ramirez L, Normoyle K, Stinson T, Staley KJ, Lillis KP. 2-Photon imaging of fluorescent proteins in living swine. Sci Rep 2023; 13:14158. [PMID: 37644074 PMCID: PMC10465491 DOI: 10.1038/s41598-023-40638-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Accepted: 08/11/2023] [Indexed: 08/31/2023] Open
Abstract
A common point of failure in translation of preclinical neurological research to successful clinical trials comes in the giant leap from rodent models to humans. Non-human primates are phylogenetically close to humans, but cost and ethical considerations prohibit their widespread usage in preclinical trials. Swine have large, gyrencencephalic brains, which are biofidelic to human brains. Their classification as livestock makes them a readily accessible model organism. However, their size has precluded experiments involving intravital imaging with cellular resolution. Here, we present a suite of techniques and tools for in vivo imaging of porcine brains with subcellular resolution. Specifically, we describe surgical techniques for implanting a synthetic, flexible, transparent dural window for chronic optical access to the neocortex. We detail optimized parameters and methods for injecting adeno-associated virus vectors through the cranial imaging window to express fluorescent proteins. We introduce a large-animal 2-photon microscope that was constructed with off-the shelf components, has a gantry design capable of accommodating animals > 80 kg, and is equipped with a high-speed digitizer for digital fluorescence lifetime imaging. Finally, we delineate strategies developed to mitigate the substantial motion artifact that complicates high resolution imaging in large animals, including heartbeat-triggered high-speed image stack acquisition. The effectiveness of this approach is demonstrated in sample images acquired from pigs transduced with the chloride-sensitive fluorescent protein SuperClomeleon.
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Affiliation(s)
- Beth A Costine-Bartell
- Department of Neurosurgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Luis Martinez-Ramirez
- Department of Neurosurgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Kieran Normoyle
- Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Tawny Stinson
- Department of Neurosurgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Kevin J Staley
- Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.
| | - Kyle P Lillis
- Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.
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Nikam RM, Kecskemethy HH, Kandula VVR, Averill LW, Langhans SA, Yue X. Abusive Head Trauma Animal Models: Focus on Biomarkers. Int J Mol Sci 2023; 24:4463. [PMID: 36901893 PMCID: PMC10003453 DOI: 10.3390/ijms24054463] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Revised: 02/07/2023] [Accepted: 02/17/2023] [Indexed: 02/26/2023] Open
Abstract
Abusive head trauma (AHT) is a serious traumatic brain injury and the leading cause of death in children younger than 2 years. The development of experimental animal models to simulate clinical AHT cases is challenging. Several animal models have been designed to mimic the pathophysiological and behavioral changes in pediatric AHT, ranging from lissencephalic rodents to gyrencephalic piglets, lambs, and non-human primates. These models can provide helpful information for AHT, but many studies utilizing them lack consistent and rigorous characterization of brain changes and have low reproducibility of the inflicted trauma. Clinical translatability of animal models is also limited due to significant structural differences between developing infant human brains and the brains of animals, and an insufficient ability to mimic the effects of long-term degenerative diseases and to model how secondary injuries impact the development of the brain in children. Nevertheless, animal models can provide clues on biochemical effectors that mediate secondary brain injury after AHT including neuroinflammation, excitotoxicity, reactive oxygen toxicity, axonal damage, and neuronal death. They also allow for investigation of the interdependency of injured neurons and analysis of the cell types involved in neuronal degeneration and malfunction. This review first focuses on the clinical challenges in diagnosing AHT and describes various biomarkers in clinical AHT cases. Then typical preclinical biomarkers such as microglia and astrocytes, reactive oxygen species, and activated N-methyl-D-aspartate receptors in AHT are described, and the value and limitations of animal models in preclinical drug discovery for AHT are discussed.
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Affiliation(s)
- Rahul M. Nikam
- Diagnostic & Research PET/MR Center, Nemours Children’s Health, Wilmington, DE 19803, USA
- Department of Radiology, Nemours Children’s Health, Wilmington, DE 19803, USA
| | - Heidi H. Kecskemethy
- Diagnostic & Research PET/MR Center, Nemours Children’s Health, Wilmington, DE 19803, USA
- Department of Radiology, Nemours Children’s Health, Wilmington, DE 19803, USA
| | - Vinay V. R. Kandula
- Department of Radiology, Nemours Children’s Health, Wilmington, DE 19803, USA
| | - Lauren W. Averill
- Diagnostic & Research PET/MR Center, Nemours Children’s Health, Wilmington, DE 19803, USA
- Department of Radiology, Nemours Children’s Health, Wilmington, DE 19803, USA
| | - Sigrid A. Langhans
- Diagnostic & Research PET/MR Center, Nemours Children’s Health, Wilmington, DE 19803, USA
- Nemours Biomedical Research, Nemours Children’s Health, Wilmington, DE 19803, USA
| | - Xuyi Yue
- Diagnostic & Research PET/MR Center, Nemours Children’s Health, Wilmington, DE 19803, USA
- Department of Radiology, Nemours Children’s Health, Wilmington, DE 19803, USA
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Kaneko N, Nishizawa H, Fujimoto J, Nanao T, Kimura Y, Owada G. An infantile traumatic brain injury with a bright tree appearance detected before the late seizure. Childs Nerv Syst 2023; 39:285-288. [PMID: 35739288 DOI: 10.1007/s00381-022-05589-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Accepted: 06/16/2022] [Indexed: 11/27/2022]
Abstract
INDRODUCTION Infantile traumatic brain injury (TBI) rarely follows a biphasic clinical course and exhibits a bright tree appearance (BTA) on magnetic resonance imaging (MRI). This is termed infantile traumatic brain injury with a biphasic clinical course and late reduced diffusion (TBIRD). TBIRD has clinical features similar to those of acute encephalopathy with biphasic seizures and late reduced diffusion (AESD). It remains to be clarified which patients with infantile TBI will develop TBIRD and the prevention and treatment of TBIRD. CASE AND REVIEW We report a case of TBIRD that exhibited BTA 1 day before the late seizure and review 12 cases of TBIRD. All patients developed a subdural hematoma (SDH), were younger than 2 years, and presented with a biphasic phase within 3-6 days. The median interval between BTA and TBI was 5 days. Of the 5 cases examined with MRI before the biphasic phase, only our case was detected with BTA 4 days after TBI. CONCLUSION Predicting the biphasic clinical course may be possible by examining MRI after TBI in patients under 2 years of age who develop SDH with unconsciousness, seizure, or hemiplegia, and these patients should be strictly followed up for 1 week.
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Affiliation(s)
- Naoki Kaneko
- Department of Intensive Care Medicine, Yokohama Rosai Hospital, 3211 Kozukue-cho, Kohoku-ku, Yokohama, Kanagawa, 222-0036, Japan.
| | - Hideo Nishizawa
- Department of Intensive Care Medicine, Yokohama Rosai Hospital, 3211 Kozukue-cho, Kohoku-ku, Yokohama, Kanagawa, 222-0036, Japan
| | - Junichi Fujimoto
- Department of Intensive Care Medicine, Yokohama Rosai Hospital, 3211 Kozukue-cho, Kohoku-ku, Yokohama, Kanagawa, 222-0036, Japan
| | - Taikan Nanao
- Department of Intensive Care Medicine, Yokohama Rosai Hospital, 3211 Kozukue-cho, Kohoku-ku, Yokohama, Kanagawa, 222-0036, Japan
| | - Yasuhiro Kimura
- Department of Intensive Care Medicine, Yokohama Rosai Hospital, 3211 Kozukue-cho, Kohoku-ku, Yokohama, Kanagawa, 222-0036, Japan
| | - Gen Owada
- Department of Intensive Care Medicine, Yokohama Rosai Hospital, 3211 Kozukue-cho, Kohoku-ku, Yokohama, Kanagawa, 222-0036, Japan
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Lãzãrescu AM, Benichi S, Blauwblomme T, Beccaria K, Bourgeois M, Roux CJ, Vergnaud E, Montmayeur J, Meyer P, Cohen JF, Chalumeau M, Blangis F, Orliaguet G. Abusive Head Trauma in Infants During the COVID-19 Pandemic in the Paris Metropolitan Area. JAMA Netw Open 2022; 5:e2226182. [PMID: 36040743 PMCID: PMC9428740 DOI: 10.1001/jamanetworkopen.2022.26182] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
IMPORTANCE The COVID-19 pandemic and the containment and mitigation measures taken were feared to be associated with increased child abuse. OBJECTIVE To investigate the trend of abusive head trauma (AHT) incidence and severity in infants during the COVID-19 pandemic. DESIGN, SETTING, AND PARTICIPANTS In a time-series analysis of a longitudinal, population-based, cohort study, all consecutive cases of AHT in infants younger than 12 months old referred between January 2017 and December 2021 to Necker Hospital for Sick Children, the single regional pediatric neurosurgery center for the Paris metropolitan area, were included. AHT was defined as 1 or more subdural hemorrhage and a positive multidisciplinary evaluation after a social, clinical, biological, and radiological workup. Data were analyzed from January to March 2022. MAIN OUTCOMES AND MEASURES The primary outcome was the monthly incidence of AHT, which was analyzed using Poisson regression modeling. Secondary outcomes included mortality and severe morbidity and were studied with logistic and linear regressions. The monthly incidence of neurosurgical interventions for hydrocephalus was used as a control series. RESULTS Among the 99 included infants with AHT (median [IQR] age, 4 [3-6] months; 64 boys [65%]), 86 of 99 (87%) had bridging vein thrombosis, 74 of 99 (75%) had retinal hemorrhages, 23 of 72 (32%) had fractures, 26 of 99 (26%) had status epilepticus, 20 of 99 (20%) had skin injuries, 53 of 99 (54%) underwent neurosurgical interventions, and 13 of 99 (13%) died. Compared with the prepandemic period (2017-2019), AHT incidence was stable in 2020 (adjusted incidence rate ratio, 1.02; 95% CI, 0.59-1.77) and then significantly increased in 2021 (adjusted incidence rate ratio, 1.92; 95% CI, 1.23-2.99). The severity of AHT worsened in 2021 in terms of mortality (odds ratio 9.39; 95% CI, 1.88-47.00). Other secondary outcomes and the control series were not significantly modified. CONCLUSIONS AND RELEVANCE In this cohort study, a marked increase in AHT incidence and severity occurred during the COVID-19 pandemic in the Paris metropolitan area. These results suggest the need for clinical awareness and preventive actions.
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Affiliation(s)
- Alina-Marilena Lãzãrescu
- Department of Pediatric Anesthesia and Intensive Care, Assistance Publique–Hôpitaux de Paris, Necker-Enfants Malades Hospital, Université Paris Cité, Paris, France
| | - Sandro Benichi
- Department of Pediatric Neurosurgery, Assistance Publique–Hôpitaux de Paris, Necker-Enfants Malades Hospital, Université Paris Cité, Paris, France
| | - Thomas Blauwblomme
- Department of Pediatric Neurosurgery, Assistance Publique–Hôpitaux de Paris, Necker-Enfants Malades Hospital, Université Paris Cité, Paris, France
| | - Kévin Beccaria
- Department of Pediatric Neurosurgery, Assistance Publique–Hôpitaux de Paris, Necker-Enfants Malades Hospital, Université Paris Cité, Paris, France
| | - Marie Bourgeois
- Department of Pediatric Neurosurgery, Assistance Publique–Hôpitaux de Paris, Necker-Enfants Malades Hospital, Université Paris Cité, Paris, France
| | - Charles-Joris Roux
- Department of Pediatric Radiology, Assistance Publique–Hôpitaux de Paris, Necker-Enfants Malades Hospital, Université Paris Cité, Paris, France
| | - Estelle Vergnaud
- Department of Pediatric Anesthesia and Intensive Care, Assistance Publique–Hôpitaux de Paris, Necker-Enfants Malades Hospital, Université Paris Cité, Paris, France
| | - Juliette Montmayeur
- Department of Pediatric Anesthesia and Intensive Care, Assistance Publique–Hôpitaux de Paris, Necker-Enfants Malades Hospital, Université Paris Cité, Paris, France
| | - Philippe Meyer
- Department of Pediatric Anesthesia and Intensive Care, Assistance Publique–Hôpitaux de Paris, Necker-Enfants Malades Hospital, Université Paris Cité, Paris, France
| | - Jérémie F. Cohen
- Obstetrical, Perinatal and Pediatric Epidemiology Research Team, Centre of Research in Epidemiology and Statistics, Université Paris Cité, Institut National de la Santé et de la Recherche Medicale, Paris, France
- Child Protection Unit, Department of General Pediatrics and Pediatric Infectious Diseases, Assistance Publique–Hôpitaux de Paris, Necker-Enfants Malades Hospital, Université Paris Cité, Paris, France
| | - Martin Chalumeau
- Obstetrical, Perinatal and Pediatric Epidemiology Research Team, Centre of Research in Epidemiology and Statistics, Université Paris Cité, Institut National de la Santé et de la Recherche Medicale, Paris, France
- Child Protection Unit, Department of General Pediatrics and Pediatric Infectious Diseases, Assistance Publique–Hôpitaux de Paris, Necker-Enfants Malades Hospital, Université Paris Cité, Paris, France
| | - Flora Blangis
- Obstetrical, Perinatal and Pediatric Epidemiology Research Team, Centre of Research in Epidemiology and Statistics, Université Paris Cité, Institut National de la Santé et de la Recherche Medicale, Paris, France
- Child Protection Unit, Department of General Pediatrics and Pediatric Infectious Diseases, Assistance Publique–Hôpitaux de Paris, Necker-Enfants Malades Hospital, Université Paris Cité, Paris, France
| | - Gilles Orliaguet
- Department of Pediatric Anesthesia and Intensive Care, Assistance Publique–Hôpitaux de Paris, Necker-Enfants Malades Hospital, Université Paris Cité, Paris, France
- Unit EA7323 Evaluation of Therapeutics and Pharmacology in Perinatality and Pediatrics, Université Paris Cité, Paris, France
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Martinez-Ramirez L, Slate A, Price G, Duhaime AC, Staley K, Costine-Bartell BA. Robust, long-term video EEG monitoring in a porcine model of post-traumatic epilepsy. eNeuro 2022; 9:ENEURO.0025-22.2022. [PMID: 35697513 PMCID: PMC9275145 DOI: 10.1523/eneuro.0025-22.2022] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Revised: 05/09/2022] [Accepted: 05/13/2022] [Indexed: 11/23/2022] Open
Abstract
To date, post-traumatic epilepsy (PTE) research in large animal models has been limited. Recent advances in neocortical microscopy have made possible new insights into neocortical PTE. However, it is very difficult to engender convincing neocortical PTE in rodents. Thus, large animal models that develop neocortical PTE may provide useful insights that also can be more comparable to human patients. Because gyrencephalic species have prolonged latent periods, long-term video EEG recording is required. Here, we report a fully subcutaneous EEG implant with synchronized video in freely ambulatory swine for up to 13 months during epileptogenesis following bilateral cortical impact injuries or sham surgery The advantages of this system include the availability of a commercially available system that is simple to install, a low failure rate after surgery for EEG implantation, radiotelemetry that enables continuous monitoring of freely ambulating animals, excellent synchronization to video to EEG, and a robust signal to noise ratio. The disadvantages of this system in this species and age are the accretion of skull bone which entirely embedded a subset of skull screws and EEG electrodes, and the inability to rearrange the EEG electrode array. These disadvantages may be overcome by splicing a subdural electrode strip to the electrode leads so that skull growth is less likely to interfere with long-term signal capture and by placing two implants for a more extensive montage. This commercially available system in this bilateral cortical impact swine model may be useful to a wide range of investigators studying epileptogenesis in PTE.SignificancePost-traumatic epilepsy (PTE) is a cause of significant morbidity after traumatic brain injury (TBI) and is often drug-resistant. Robust, informative animal models would greatly facilitate PTE research. Ideally, this biofidelic model of PTE would utilize a species that approximates human brain anatomy, brain size, glial populations, and inflammatory pathways. An ideal model would also incorporate feasible methods for long-term video EEG recording required to quantify seizure activity. Here, we describe the first model of PTE in swine and describe a method for robust long-term video EEG monitoring for up to 13 months post-TBI. The relatively easy "out-of-the-box" radiotelemetry system and surgical techniques described here will be adaptable by a wide array of investigators studying the pathogenesis and treatment of PTE.
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Affiliation(s)
- Luis Martinez-Ramirez
- Department of Neurosurgery, Massachusetts General Hospital, Boston, Massachusetts, United States of America
| | - Andrea Slate
- Center for Comparative Medicine, Massachusetts General Hospital, Boston, Massachusetts, United States of America
| | - George Price
- Department of Neurosurgery, Massachusetts General Hospital, Boston, Massachusetts, United States of America
| | - Ann-Christine Duhaime
- Department of Neurosurgery, Massachusetts General Hospital, Boston, Massachusetts, United States of America
- Department of Neurosurgery, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Kevin Staley
- Department of Neurosurgery, Massachusetts General Hospital, Boston, Massachusetts, United States of America
- Department of Neurosurgery, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Beth A Costine-Bartell
- Department of Neurosurgery, Massachusetts General Hospital, Boston, Massachusetts, United States of America
- Department of Neurosurgery, Harvard Medical School, Boston, Massachusetts, United States of America
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