Entropy interference from operating tables

Entropy interference from operating tables The Association of Anaesthetists (AAGBI) recommends depth of anaesthesia monitoring when patients are anaesthetised with total intravenous anaesthesia (TIVA) and neuromuscular blocking agents to reduce the risk of accidental awareness . At our institution, we have become aware of significant interference with entropy processed electroencephalography readings on Datex Ohmeda S5 monitors (GE Healthcare, Chicago, IL, USA), occurring when an Eschmann T20‐1 operating table (Eschmann, Lancing, UK) is plugged in and charging, but disappearing when the table is unplugged. Both response entropy (RE) and state entropy (SE) appear to be affected, producing erroneously high numbers with a divergence in the SE and RE values. On unplugging the table charger, we note that the displayed values for both SE and RE significantly decrease, suggesting the patient has been receiving an inappropriately high dose of anaesthetic (Fig. ).Change in entropy values on unplugging the Eschmann T20‐1 operating table (arrows).We contacted the table manufacturer, who confirmed that this is a recognised interaction caused by natural leakage (touch current leakage) from the charger. They suggest that it would be seen with any similar equipment connected to both the patient and the mains supply, and that the table should be operated by battery when in use to http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Anaesthesia Wiley

Entropy interference from operating tables

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Publisher
Wiley Subscription Services, Inc., A Wiley Company
Copyright
Copyright © 2018 The Association of Anaesthetists of Great Britain and Ireland
ISSN
0003-2409
eISSN
1365-2044
D.O.I.
10.1111/anae.14256
Publisher site
See Article on Publisher Site

Abstract

The Association of Anaesthetists (AAGBI) recommends depth of anaesthesia monitoring when patients are anaesthetised with total intravenous anaesthesia (TIVA) and neuromuscular blocking agents to reduce the risk of accidental awareness . At our institution, we have become aware of significant interference with entropy processed electroencephalography readings on Datex Ohmeda S5 monitors (GE Healthcare, Chicago, IL, USA), occurring when an Eschmann T20‐1 operating table (Eschmann, Lancing, UK) is plugged in and charging, but disappearing when the table is unplugged. Both response entropy (RE) and state entropy (SE) appear to be affected, producing erroneously high numbers with a divergence in the SE and RE values. On unplugging the table charger, we note that the displayed values for both SE and RE significantly decrease, suggesting the patient has been receiving an inappropriately high dose of anaesthetic (Fig. ).Change in entropy values on unplugging the Eschmann T20‐1 operating table (arrows).We contacted the table manufacturer, who confirmed that this is a recognised interaction caused by natural leakage (touch current leakage) from the charger. They suggest that it would be seen with any similar equipment connected to both the patient and the mains supply, and that the table should be operated by battery when in use to

Journal

AnaesthesiaWiley

Published: Jan 1, 2018

References

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