Article (Scientific journals)
Resting-state Network-specific Breakdown of Functional Connectivity during Ketamine Alteration of Consciousness in Volunteers
BONHOMME, Vincent; VANHAUDENHUYSE, Audrey; Demertzi, Athina et al.
2016In Anesthesiology, 125 (5), p. 873-878
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Keywords :
ketamine; MRI; functional connectivity; consciousness
Abstract :
[en] Background: Consciousness-altering anesthetic agents disturb connectivity between brain regions composing the resting-state consciousness networks (RSNs). The default mode network (DMn), executive control network, salience network (SALn), auditory network, sensorimotor network (SMn), and visual network sustain mentation. Ketamine modifies consciousness differently from other agents, producing psychedelic dreaming and no apparent interaction with the environment. The authors used functional magnetic resonance imaging to explore ketamine-induced changes in RSNs connectivity. Methods: Fourteen healthy volunteers received stepwise intravenous infusions of ketamine up to loss of responsiveness. Because of agitation, data from six subjects were excluded from analysis. RSNs connectivity was compared between absence of ketamine (wake state [W1]), light ketamine sedation, and ketamine-induced unresponsiveness (deep sedation [S2]). Results: Increasing the depth of ketamine sedation from W1 to S2 altered DMn and SALn connectivity and suppressed the anticorrelated activity between DMn and other brain regions. During S2, DMn connectivity, particularly between the medial prefrontal cortex and the remaining network (effect size β [95% CI]: W1 = 0.20 [0.18 to 0.22]; S2 = 0.07 [0.04 to 0.09]), and DMn anticorrelated activity (e.g., right sensory cortex: W1 = −0.07 [−0.09 to −0.04]; S2 = 0.04 [0.01 to 0.06]) were broken down. SALn connectivity was nonuniformly suppressed (e.g., left parietal operculum: W1 = 0.08 [0.06 to 0.09]; S2 = 0.05 [0.02 to 0.07]). Executive control networks, auditory network, SMn, and visual network were minimally affected. Conclusions: Ketamine induces specific changes in connectivity within and between RSNs. Breakdown of frontoparietal DMn connectivity and DMn anticorrelation and sensory and SMn connectivity preservation are common to ketamine and propofol-induced alterations of consciousness.
Research Center/Unit :
GIGA‐R - Giga‐Research - ULiège
GIGA CRC (Cyclotron Research Center) In vivo Imaging-Aging & Memory - ULiège
Disciplines :
Anesthesia & intensive care
Author, co-author :
BONHOMME, Vincent  ;  Centre Hospitalier Universitaire de Liège - CHU > Service d'anesthésie - réanimation
VANHAUDENHUYSE, Audrey  ;  Centre Hospitalier Universitaire de Liège - CHU > Service d'algologie - soins palliatifs
Demertzi, Athina  ;  Université de Liège > Centre de recherches du cyclotron
Bruno, Marie-Aurélie 
JAQUET, Océane ;  Centre Hospitalier Universitaire de Liège - CHU > Service d'anesthésie - réanimation
Bahri, Mohamed Ali  ;  Université de Liège > Centre de Recherches du Cyclotron > Centre de Recherches du Cyclotron
Plenevaux, Alain  ;  Université de Liège > Département de chimie (sciences) > Département de chimie (sciences)
Boly, Mélanie
BOVEROUX, Pierre 
Soddu, Andrea ;  Université de Liège > Centre de recherches du cyclotron
BRICHANT, Jean-François ;  Centre Hospitalier Universitaire de Liège - CHU > Service d'anesthésie - réanimation
MAQUET, Pierre  ;  Centre Hospitalier Universitaire de Liège - CHU > Service de neurologie
LAUREYS, Steven  ;  Centre Hospitalier Universitaire de Liège - CHU > Service de neurologie
More authors (3 more) Less
Language :
English
Title :
Resting-state Network-specific Breakdown of Functional Connectivity during Ketamine Alteration of Consciousness in Volunteers
Publication date :
November 2016
Journal title :
Anesthesiology
ISSN :
0003-3022
eISSN :
1528-1175
Publisher :
Lippincott Williams & Wilkins, Philadelphia, United States - Pennsylvania
Volume :
125
Issue :
5
Pages :
873-878
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique
EC - European Commission
JSMF - James S McDonnell Foundation
ESA - European Space Agency
MSF - Mind Science Foundation
FWB - Fédération Wallonie-Bruxelles
UET - Université Européenne du Travail
FERB - Fondazione Europea Ricerca Biomedica
ULiège - University of Liège
CHU Liège - Central University Hospital of Liege
Funding text :
The French Speaking Community Concerted Research Action (ARC - 06/11 – 340, Brussels, Belgium)
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