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Smets H, Stumpp L, Chavez J, Cury J, Vande Perre L, Doguet P, Vanhoestenberghe A, Delbeke J, El Tahry R, Nonclercq A. Chronic recording of the vagus nerve to analyze modulations by the light-dark cycle. J Neural Eng 2022; 19. [PMID: 35764074 DOI: 10.1088/1741-2552/ac7c8f] [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: 12/15/2021] [Accepted: 06/28/2022] [Indexed: 11/12/2022]
Abstract
OBJECTIVE The vagus nerve is considered to play a key role in the circadian rhythm. Chronic continuous analysis of the vagus nerve activity could contribute to a better understanding of the role of the vagus nerve in light-dark modulations. This paper presents a continuous analysis of spontaneous vagus nerve activity performed in four rats. APPROACH We analyzed the vagus electroneurogram (VENG) and electroencephalogram (EEG) over a recording period of 28 days. Spike activity and heart rate estimation were derived from the VENG, and slow-wave activity was derived from the EEG. The presence of repetitive patterns was investigated with periodograms, cosinor fitting, autocorrelation, and statistical tests. The light-dark variations derived from the VENG spikes were compared with EEG slow waves, an established metric in circadian studies. RESULTS Our results demonstrate that light-dark variations can be detected in long-term vagus nerve activity monitoring. A recording period of about seven days is required to characterize accurately the VENG light-dark variations. SIGNIFICANCE As a major outcome of this study, vagus nerve recordings hold the promise to help understand circadian regulation.
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Affiliation(s)
- Hugo Smets
- BEAMS, Université Libre de Bruxelles Faculté des sciences appliquées/Ecole polytechnique, Avenue Franklin Roosevelt, 50, CP 165/56, Bruxelles, 1050, BELGIUM
| | - Lars Stumpp
- IONS, Université catholique de Louvain, Avenue Mounier 53/B1.53.05, Brussels, 1200, BELGIUM
| | - Javier Chavez
- BEAMS, Université Libre de Bruxelles Faculté des sciences appliquées/Ecole polytechnique, Avenue Franklin Roosevelt, 50, CP 165/56, Bruxelles, 1050, BELGIUM
| | - Joaquin Cury
- BEAMS, Université Libre de Bruxelles Faculté des sciences appliquées/Ecole polytechnique, Avenue Franklin Roosevelt, 50, CP 165/56, Bruxelles, 1050, BELGIUM
| | - Louis Vande Perre
- BEAMS, Université Libre de Bruxelles Faculté des sciences appliquées/Ecole polytechnique, Avenue Franklin Roosevelt, 50, CP 165/56, Bruxelles, 1050, BELGIUM
| | - Pascal Doguet
- Synergia Medical SA, Rue Emile Francqui 6, Mont-Saint-Guibert, 1435, BELGIUM
| | - Anne Vanhoestenberghe
- Aspire Centre for Rehabilitation Engineering and Assistive Technology, University College London, Brockley Hill, Aspire Create - IOMS BUilding, RNOH campus, London, HA74LP, UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND
| | - Jean Delbeke
- Private Address - Belgium, Seringenstraat 27, Kraainem, B-1950, BELGIUM
| | - Riëm El Tahry
- IONS, Université catholique de Louvain, Avenue Mounier 53/B1.53.05, Brussels, 1200, BELGIUM
| | - Antoine Nonclercq
- BEAMS, Université Libre de Bruxelles Faculté des sciences appliquées/Ecole polytechnique, Avenue Franklin Roosevelt, 50, CP 165/56, Bruxelles, 1050, BELGIUM
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The Benefit of Neuromuscular Blockade in Patients with Postanoxic Myoclonus Otherwise Obscuring Continuous Electroencephalography (CEEG). Crit Care Res Pract 2017; 2017:2504058. [PMID: 28265468 PMCID: PMC5317108 DOI: 10.1155/2017/2504058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Revised: 01/08/2017] [Accepted: 01/18/2017] [Indexed: 12/04/2022] Open
Abstract
Introduction. Myoclonus status epilepticus is independently associated with poor outcome in coma patients after cardiac arrest. Determining if myoclonus is of cortical origin on continuous electroencephalography (CEEG) can be difficult secondary to the muscle artifact obscuring the underlying CEEG. The use of a neuromuscular blocker can be useful in these cases. Methods. Retrospective review of CEEG in patients with postanoxic myoclonus who received cisatracurium while being monitored. Results. Twelve patients (mean age: 53.3 years; 58.3% male) met inclusion criteria of clinical postanoxic myoclonus. The initial CEEG patterns immediately prior to neuromuscular blockade showed myoclonic artifact with continuous slowing (50%), burst suppression with myoclonic artifact (41.7%), and continuous myogenic artifact obscuring CEEG (8.3%). After intravenous administration of cisatracurium (0.1 mg–2 mg), reduction in artifact improved quality of CEEG recordings in 9/12 (75%), revealing previously unrecognized patterns: continuous EEG seizures (33.3%), lateralizing slowing (16.7%), burst suppression (16.7%), generalized periodic discharges (8.3%), and, in the patient who had an initially uninterpretable CEEG from myogenic artifact, continuous slowing. Conclusion. Short-acting neuromuscular blockade is useful in determining background cerebral activity on CEEG otherwise partially or completely obscured by muscle artifact in patients with postanoxic myoclonus. Fully understanding background cerebral activity is important in prognostication and treatment, particularly when there are underlying EEG seizures.
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Bradford JC, Lukos JR, Ferris DP. Electrocortical activity distinguishes between uphill and level walking in humans. J Neurophysiol 2015; 115:958-66. [PMID: 26683062 DOI: 10.1152/jn.00089.2015] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Accepted: 12/11/2015] [Indexed: 11/22/2022] Open
Abstract
The objective of this study was to determine if electrocortical activity is different between walking on an incline compared with level surface. Subjects walked on a treadmill at 0% and 15% grades for 30 min while we recorded electroencephalography (EEG). We used independent component (IC) analysis to parse EEG signals into maximally independent sources and then computed dipole estimations for each IC. We clustered cortical source ICs and analyzed event-related spectral perturbations synchronized to gait events. Theta power fluctuated across the gait cycle for both conditions, but was greater during incline walking in the anterior cingulate, sensorimotor and posterior parietal clusters. We found greater gamma power during level walking in the left sensorimotor and anterior cingulate clusters. We also found distinct alpha and beta fluctuations, depending on the phase of the gait cycle for the left and right sensorimotor cortices, indicating cortical lateralization for both walking conditions. We validated the results by isolating movement artifact. We found that the frequency activation patterns of the artifact were different than the actual EEG data, providing evidence that the differences between walking conditions were cortically driven rather than a residual artifact of the experiment. These findings suggest that the locomotor pattern adjustments necessary to walk on an incline compared with level surface may require supraspinal input, especially from the left sensorimotor cortex, anterior cingulate, and posterior parietal areas. These results are a promising step toward the use of EEG as a feed-forward control signal for ambulatory brain-computer interface technologies.
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Affiliation(s)
- J Cortney Bradford
- Translational Neuroscience Branch, US Army Research Laboratory, Aberdeen Proving Ground, Maryland; School of Kinesiology, University of Michigan, Ann Arbor, Michigan
| | - Jamie R Lukos
- Applied Research and Advanced Concepts Branch, Space and Naval Warfare Systems Center (SPAWAR), Pacific, San Diego, California; and
| | - Daniel P Ferris
- School of Kinesiology, University of Michigan, Ann Arbor, Michigan
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O’Regan S, Faul S, Marnane W. Automatic detection of EEG artefacts arising from head movements using EEG and gyroscope signals. Med Eng Phys 2013; 35:867-74; discussion 867. [DOI: 10.1016/j.medengphy.2012.08.017] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2011] [Revised: 08/17/2012] [Accepted: 08/24/2012] [Indexed: 10/27/2022]
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Mihajlović V, Li H, Grundlehner B, Penders J, Schouten AC. Investigating the impact of force and movements on impedance magnitude and EEG. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2013; 2013:1466-1469. [PMID: 24109975 DOI: 10.1109/embc.2013.6609788] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The success of applying dry sensor technology in measuring electroencephalogram (EEG) signals will have a significant impact on a wider adoption of brain activity monitoring in ambulatory as well as real life solutions. The presence of motion artifacts is the major obstacle in applying dry sensors for long-term EEG monitoring. In this paper we assess the impact of external forces applied on a dry EEG electrode as well as the impact of head and body movements on the electrode-tissue contact impedance and the EEG signal. The data collection method and the preliminary correlation analysis are presented. The analysis demonstrates that the impedance magnitude and EEG changes are highly correlated when artifacts are induced by the application of force or head and body movements, only in case these artifacts are short (less than 3s) and exhibit regular pattern. The correlation between the EEG and impedance magnitude is lower for longer artifact segments, especially the ones containing artifacts with irregular movements or large variations in the applied force. This indicates a time-dependent, non-linear relation between the artifact-related phenomena, impedance magnitude, and EEG.
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