Propofol attenuates low-frequency fluctuations of resting-state fMRI BOLD signal in the anterior frontal cortex upon loss of consciousness. Neuroimage 2017 Feb 15;147:295-301
Date
12/21/2016Pubmed ID
27993673Pubmed Central ID
PMC5303656DOI
10.1016/j.neuroimage.2016.12.043Scopus ID
2-s2.0-85007209110 28 CitationsAbstract
Recent studies indicate that spontaneous low-frequency fluctuations (LFFs) of resting-state functional magnetic resonance imaging (rs-fMRI) blood oxygen level-dependent (BOLD) signals are driven by the slow (<0.1Hz) modulation of ongoing neuronal activity synchronized locally and across remote brain regions. How regional LFFs of the BOLD fMRI signal are altered during anesthetic-induced alteration of consciousness is not well understood. Using rs-fMRI in 15 healthy participants, we show that during administration of propofol to achieve loss of behavioral responsiveness indexing unconsciousness, the fractional amplitude of LFF (fALFF index) was reduced in comparison to wakeful baseline in the anterior frontal regions, temporal pole, hippocampus, parahippocampal gyrus, and amygdala. Such changes were absent in large areas of the motor, parietal, and sensory cortices. During light sedation characterized by the preservation of overt responsiveness and therefore consciousness, fALFF was reduced in the subcortical areas, temporal pole, medial orbital frontal cortex, cingulate cortex, and cerebellum. Between light sedation and deep sedation, fALFF was reduced primarily in the medial and dorsolateral frontal areas. The preferential reduction of LFFs in the anterior frontal regions is consistent with frontal to sensory-motor cortical disconnection and may contribute to the suppression of consciousness during general anesthesia.
Author List
Liu X, Lauer KK, Douglas Ward B, Roberts C, Liu S, Gollapudy S, Rohloff R, Gross W, Chen G, Xu Z, Binder JR, Li SJ, Hudetz AGAuthors
Jeffrey R. Binder MD Professor in the Neurology department at Medical College of WisconsinSuneeta Gollapudy MD Associate Professor in the Anesthesiology department at Medical College of Wisconsin
William Gross MD, PhD Assistant Professor in the Anesthesiology department at Medical College of Wisconsin
Kathryn K. Lauer MD Vice Chair, Professor in the Anesthesiology department at Medical College of Wisconsin
Christopher J. Roberts MD, PhD Assistant Professor in the Anesthesiology department at Medical College of Wisconsin
MESH terms used to index this publication - Major topics in bold
AdultBrain
Connectome
Conscious Sedation
Consciousness
Deep Sedation
Female
Humans
Hypnotics and Sedatives
Magnetic Resonance Imaging
Male
Prefrontal Cortex
Propofol
Young Adult
