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Published in: Cognitive Neurodynamics 6/2023

22-11-2022 | Research Article

Propofol modulates neural dynamics of thalamo-cortical system associated with anesthetic levels in rats

Authors: Xuliang Jiang, Xin Wen, Guoyao Ou, Shitong Li, Yali Chen, Jun Zhang, Zhenhu Liang

Published in: Cognitive Neurodynamics | Issue 6/2023

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Abstract

The thalamocortical system plays an important role in consciousness. How anesthesia modulates the thalamocortical interactions is not completely known.  We simultaneously recorded local field potentials(LFPs) in thalamic reticular nucleus(TRN) and ventroposteromedial thalamic nucleus(VPM), and electrocorticographic(ECoG) activities in frontal and occipital cortices in freely moving rats (n = 11). We analyzed the changes in thalamic and cortical local spectral power and connectivities, which were measured with phase-amplitude coupling (PAC), coherence and multivariate Granger causality, at the states of baseline, intravenous infusion of propofol 20, 40, 80 mg/kg/h and after recovery of righting reflex. We found that propofol-induced burst-suppression results in a synchronous decrease of spectral power in thalamus and cortex (p < 0.001 for all frequency bands). The cross-frequency PAC increased by propofol, characterized by gradually stronger ‘trough-max’ pattern in TRN and stronger ‘peak-max’ pattern in cortex. The cross-region PAC increased in the phase of TRN modulating the amplitude of cortex. The functional connectivity (FC) between TRN and cortex for α/β bands also significantly increased (p < 0.040), with increased directional connectivity from TRN to cortex under propofol anesthesia. In contrast, the corticocortical FC significantly decreased (p < 0.047), with decreased directional connectivity from frontal cortex to occipital cortex. However, the thalamothalamic functional and directional connectivities remained largely unchanged by propofol anesthesia.  The spectral powers and connectivities are differentially modulated with the changes of propofol doses, suggesting the changes in neural dynamics in thalamocortical system could be used for distinguishing different vigilance levels caused by propofol.

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Appendix
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Metadata
Title
Propofol modulates neural dynamics of thalamo-cortical system associated with anesthetic levels in rats
Authors
Xuliang Jiang
Xin Wen
Guoyao Ou
Shitong Li
Yali Chen
Jun Zhang
Zhenhu Liang
Publication date
22-11-2022
Publisher
Springer Netherlands
Published in
Cognitive Neurodynamics / Issue 6/2023
Print ISSN: 1871-4080
Electronic ISSN: 1871-4099
DOI
https://doi.org/10.1007/s11571-022-09912-0

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