Please use this identifier to cite or link to this item: https://dora.health.qld.gov.au/qldresearchjspui/handle/1/5456
Title: Response of the GE Entropy™ monitor to neuromuscular block in awake volunteers
Authors: Peter J Schuller 
Pretorius, Jan P G
Newbery, Kym B
Issue Date: 2023
Source: Schuller PJ, Pretorius JPG, Newbery KB. Response of the GE Entropy™ monitor to neuromuscular block in awake volunteers. Br J Anaesth. 2023 Nov;131(5):882-892. doi: 10.1016/j.bja.2023.08.013. PMID: 37879777.
Journal: BJA: The British Journal of Anaesthesia
Abstract: The GE Entropy™ monitor analyses the frontal electroencephalogram (EEG) and generates two indices intended to represent the degree of anaesthetic drug effect on the brain. It is frequently used in the context of neuromuscular block. We have shown that a similar device, the Bispectral Index monitor (BIS), does not generate correct values in awake volunteers when neuromuscular blocking drugs are administered. We replayed the EEGs recorded during awake paralysis from the original study to an Entropy monitor via a calibrated electronic playback system. Each EEG was replayed 30 times to evaluate the consistency of the Entropy output. Both State Entropy and Response Entropy decreased during periods of neuromuscular block to values consistent with anaesthesia, despite there being no change in conscious state (State Entropy <60 in eight of nine rocuronium trials and nine of 10 suxamethonium trials). Entropy values did not return to pre-test levels until after the return of movement. Entropy did not generate exactly the same results when the same EEG was replayed multiple times, which is primarily because of a cyclical state within the Entropy system itself. The GE Entropy™ monitor requires muscle activity to generate correct values in an awake subject. It could therefore be unreliable at detecting awareness in patients who have been given neuromuscular blocking drugs. In addition, Entropy does not generate the same result each time it is presented with the same EEG.
Description: Cairns & Hinterland Hospital and Health Service (CHHHS) affiliated author: Peter J Schuller
DOI: 10.1016/j.bja.2023.08.013
Keywords: bispectral index;depth of anaesthesia monitor;E-Entropy;electroencephalography;measurement techniques, spectral analysis
Type: Article
Appears in Sites:Cairns & Hinterland HHS Publications

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