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Larzabal C, Bonnet S, Costecalde T, Auboiroux V, Charvet G, Chabardes S, Aksenova T, Sauter-Starace F. Long-term stability of the chronic epidural wireless recorder WIMAGINE in tetraplegic patients. J Neural Eng 2021; 18. [PMID: 34425566 DOI: 10.1088/1741-2552/ac2003] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Accepted: 08/23/2021] [Indexed: 11/12/2022]
Abstract
Objective.The evaluation of the long-term stability of ElectroCorticoGram (ECoG) signals is an important scientific question as new implantable recording devices can be used for medical purposes such as Brain-Computer Interface (BCI) or brain monitoring.Approach.The long-term clinical validation of wireless implantable multi-channel acquisition system for generic interface with neurons (WIMAGINE), a wireless 64-channel epidural ECoG recorder was investigated. The WIMAGINE device was implanted in two quadriplegic patients within the context of a BCI protocol. This study focused on the ECoG signal stability in two patients bilaterally implanted in June 2017 (P1) and in November 2019 (P2).Methods. The ECoG signal was recorded at rest prior to each BCI session resulting in a 32 month and in a 14 month follow-up for P1 and P2 respectively. State-of-the-art signal evaluation metrics such as root mean square (RMS), the band power (BP), the signal to noise ratio (SNR), the effective bandwidth (EBW) and the spectral edge frequency (SEF) were used to evaluate stability of signal over the implantation time course. The time-frequency maps obtained from task-related motor activations were also studied to investigate the long-term selectivity of the electrodes.Mainresults.Based on temporal linear regressions, we report a limited decrease of the signal average level (RMS), spectral distribution (BP) and SNR, and a remarkable steadiness of the EBW and SEF. Time-frequency maps obtained during motor imagery, showed a high level of discrimination 1 month after surgery and also after 2 years.Conclusions.The WIMAGINE epidural device showed high stability over time. The signal evaluation metrics of two quadriplegic patients during 32 months and 14 months respectively provide strong evidence that this wireless implant is well-suited for long-term ECoG recording.Significance.These findings are relevant for the future of implantable BCIs, and could benefit other patients with spinal cord injury, amyotrophic lateral sclerosis, neuromuscular diseases or drug-resistant epilepsy.
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Affiliation(s)
| | - Stéphane Bonnet
- University Grenoble Alpes, CEA, LETI, DTBS, Grenoble 38000, France
| | - Thomas Costecalde
- University Grenoble Alpes, CEA, LETI, Clinatec, Grenoble 38000, France
| | - Vincent Auboiroux
- University Grenoble Alpes, CEA, LETI, Clinatec, Grenoble 38000, France
| | - Guillaume Charvet
- University Grenoble Alpes, CEA, LETI, Clinatec, Grenoble 38000, France
| | - Stéphan Chabardes
- University Grenoble Alpes, Grenoble University Hospital, Grenoble 38000, France
| | - Tetiana Aksenova
- University Grenoble Alpes, CEA, LETI, Clinatec, Grenoble 38000, France
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Abstract
Baclofen, β-(4-chlorophenyl)-γ-aminobutyric acid, holds a unique position in neuroscience, remaining the only U.S. Food and Drug Administration (FDA) approved GABAB agonist. While intended to be a more brain penetrant, i.e, ability to cross the blood-brain barrier (BBB), version of GABA (γ-aminobutyric acid) for the potential treatment of epilepsy, baclofen's highly efficacious muscle relaxant properties led to its approval, as a racemate, for the treatment of spasticity. Interestingly, baclofen received FDA approval before its receptor, GABAB, was discovered and its exact mechanism of action was known. In recent times, baclofen has a myriad of off-label uses, with the treatment for alcohol abuse and drug addiction garnering a great deal of attention. This Review aims to capture the >60 year legacy of baclofen by walking through the history, pharmacology, synthesis, drug metabolism, routes of administration, and societal impact of this Classic in chemical neuroscience.
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Affiliation(s)
- Caitlin N. Kent
- Warren Center for Neuroscience Drug Discovery, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, United States
- Department of Chemistry, Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37232, United States
| | - Charlotte Park
- Warren Center for Neuroscience Drug Discovery, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, United States
| | - Craig W. Lindsley
- Warren Center for Neuroscience Drug Discovery, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, United States
- Department of Pharmacology, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, United States
- Department of Chemistry, Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37232, United States
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, United States
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Hachimi A, ElBahja S, Rachda S, Fajri M, Abjaw Z, Boukoub N, ElKhayari M. Oral baclofen poisoning with normal renal function: A new case and review of the literature. TOXICOLOGIE ANALYTIQUE ET CLINIQUE 2019. [DOI: 10.1016/j.toxac.2019.02.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Chartier M, Malissin I, Tannous S, Labat L, Risède P, Mégarbane B, Chevillard L. Baclofen-induced encephalopathy in overdose - Modeling of the electroencephalographic effect/concentration relationships and contribution of tolerance in the rat. Prog Neuropsychopharmacol Biol Psychiatry 2018; 86:131-139. [PMID: 29782961 DOI: 10.1016/j.pnpbp.2018.05.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Revised: 05/16/2018] [Accepted: 05/17/2018] [Indexed: 12/31/2022]
Abstract
Baclofen, a γ-amino-butyric acid type-B receptor agonist with exponentially increased use at high-dose to facilitate abstinence in chronic alcoholics, is responsible for increasing poisonings. Baclofen overdose may induce severe encephalopathy and electroencephalographic (EEG) abnormalities. Whether prior prolonged baclofen treatment may influence the severity of baclofen-induced encephalopathy in overdose has not been established. We designed a rat study to characterize baclofen-induced encephalopathy, correlate its severity with plasma concentrations and investigate the contribution of tolerance. Baclofen-induced encephalopathy was assessed using continuous EEG and scored based on a ten-grade scale. Following the administration by gavage of 116 mg/kg baclofen, EEG rapidly and steadily impaired resulting in the successive onset of deepening sleep followed by generalized periodic epileptiform discharges and burst-suppressions. Thereafter, encephalopathy progressively recovered following similar phases in reverse. Periodic triphasic sharp waves, non-convulsive status epilepticus and even isoelectric signals were observed at the most critical stages. Prior repeated baclofen administration resulted in reduced severity (peak: grade 7 versus 9; peak effect length: 382 ± 40 versus 123 ± 14 min, P = 0.008) and duration of encephalopathy (18 versus > 24 h, P = 0.0007), supporting the acquisition of tolerance. The relationship between encephalopathy severity and plasma baclofen concentrations fitted a sigmoidal Emax model with an anticlockwise hysteresis loop suggesting a hypothetical biophase site of action. The baclofen concentration producing a response equivalent to 50% of Emax was significantly reduced (8947 μg/L, ±11.3% versus 12,728 μg/L, ±24.0% [mean, coefficient of variation], P = 0.03) with prior prolonged baclofen administration. In conclusion, baclofen overdose induces early-onset and prolonged marked encephalopathy that is significantly attenuated by prior repeated baclofen treatment. Our findings suggest a possible role for the blood-brain barrier in the development of tolerance; however, its definitive involvement remains to be demonstrated.
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Affiliation(s)
| | - Isabelle Malissin
- Department of Medical and Toxicological Critical Care, Lariboisière Hospital, Paris-Diderot University, Paris, France
| | - Salma Tannous
- Inserm UMRS-1144, Paris-Descartes University, Paris, France
| | - Laurence Labat
- Inserm UMRS-1144, Paris-Descartes University, Paris, France; Pharmacokinetics and Pharmaco-chemistry Unit, Cochin Hospital, Paris, France; Laboratory of Toxicology, Lariboisière Hospital, Paris, France
| | | | - Bruno Mégarbane
- Inserm UMRS-1144, Paris-Descartes University, Paris, France; Department of Medical and Toxicological Critical Care, Lariboisière Hospital, Paris-Diderot University, Paris, France.
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Beis M, Druoton AL, Scala-Bertola J, Yehele Okouma MJ, Pape E, Lalot JM, Bollaert PE. Intoxication au baclofène et récepteurs du GABA. MEDECINE INTENSIVE REANIMATION 2018. [DOI: 10.3166/rea-2018-0035] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Nous rapportons un cas d’intoxication aiguë volontaire au baclofène avec une dose ingérée probable de 3 900 mg. Le tableau clinique était celui d’un coma profond avec mydriase aréactive bilatérale et disparition des réflexes du tronc à l’exception du réflexe oculocardiaque et de la ventilation spontanée. Ce tableau persistait pendant cinq jours et évoluait vers une réversion complète des troubles et la restauration ad integrum de l’état de conscience du patient après traitement purement symptomatique. Une interaction potentielle entre baclofène, valpromide et tiapride, médicaments pris de façon chronique par le patient, est évoquée.
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Boels D, Victorri-Vigneau C, Grall-Bronnec M, Touré A, Garnier A, Turcant A, Le Roux G. Baclofen and Alcohol-Dependent Patients: A Real Risk of Severe Self-Poisoning. Basic Clin Pharmacol Toxicol 2017; 121:353-359. [DOI: 10.1111/bcpt.12779] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2017] [Accepted: 03/14/2017] [Indexed: 11/29/2022]
Affiliation(s)
- David Boels
- Poison Control Center; Angers University Hospital; Angers France
- UMR 1246 SPHERE; Methods for Patients-Centered Outcomes and Health Research; Nantes University Hospital; Nantes France
| | - Caroline Victorri-Vigneau
- UMR 1246 SPHERE; Methods for Patients-Centered Outcomes and Health Research; Nantes University Hospital; Nantes France
- Pharmacology Department - Addictovigilance; Nantes University Hospital; Nantes France
| | - Marie Grall-Bronnec
- UMR 1246 SPHERE; Methods for Patients-Centered Outcomes and Health Research; Nantes University Hospital; Nantes France
- Addictology and Psychiatry Department; Nantes University Hospital; Nantes France
| | - Ali Touré
- Poison Control Center; Angers University Hospital; Angers France
| | - Anais Garnier
- Poison Control Center; Angers University Hospital; Angers France
| | - Alain Turcant
- Pharmacology Department - Laboratory; Angers University Hospital; Angers France
| | - Gaël Le Roux
- Poison Control Center; Angers University Hospital; Angers France
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Gégu C, Gagnon N, Schmitt C, Tichadou L, Hayek-Lanthois M, De Haro L. Traitement par doses élevées de baclofène à l’origine d’un surdosage chez un éthylique chronique insuffisant rénal. Therapie 2012; 67:529-31. [DOI: 10.2515/therapie/2012070] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2012] [Accepted: 07/10/2012] [Indexed: 11/20/2022]
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Rochart N, Berger P, Brochet-Paille A, Poiron L, Chillet P. Intoxication aiguë au baclofène : places de l’EEG et de la baclofènémie ? ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.jeurea.2011.09.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Apport de l’EEG en médecine d’urgence: principales indications et contribution au diagnostic et à la prise en charge. ANNALES FRANCAISES DE MEDECINE D URGENCE 2011. [DOI: 10.1007/s13341-011-0119-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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de Broucker T. Semeiologia e orientamento diagnostico delle encefalopatie dell’adulto. Neurologia 2011. [DOI: 10.1016/s1634-7072(11)70698-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Kumar G, Sahaya K, Goyal MK, Sivaraman M, Sahota PK. Electroencephalographic abnormalities in baclofen-induced encephalopathy. J Clin Neurosci 2010; 17:1594-6. [PMID: 20833050 DOI: 10.1016/j.jocn.2010.04.038] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2009] [Accepted: 04/18/2010] [Indexed: 11/28/2022]
Abstract
We report a patient in whom the characteristic electroencephalographic features of baclofen intoxication are highlighted and emphasize the role of electrographic abnormalities in the diagnosis of this condition.
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Affiliation(s)
- Gyanendra Kumar
- Department of Neurology, University of Missouri-Healthcare Columbia, Columbia, Missouri 65212, USA.
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Abstract
Electroencephalography is a useful tool for the diagnosis and follow-up of toxic and metabolic encephalopathies. A pseudo-periodic pattern can indicate various brain pathologies and causes of mental confusion. Among these, cefepime encephalopathy should always be considered, particularly in cases of renal failure, because of the reversibility of the symptoms at drug withdrawal.
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