AB099. SOH24AB_123. Spectral entropy in the operating theatre
Anaesthesia Session

AB099. SOH24AB_123. Spectral entropy in the operating theatre

Zheng Zhou, Dave Rowe, Daniel O’Regan, Abigail Walsh

Department of Anaesthesia, St. Vincent’s University Hospital, Dublin, Ireland

Background: National Institute for Health and Care Excellence (NICE) and Association of Anaesthetists of Great Britain and Ireland (AAGBI) considers depth of anaesthesia monitoring likely cost effective and of clinical benefit in patients receiving total intravenous anaesthesia (TIVA) and in patients considered at higher risk of unintended awareness or of excessively deep levels of anaesthesia.

Methods: Audit of all surgical cases performed during the week, including within a subset of older patients (age >80 years); inclusion criteria mandated the use of neuromuscular blockade (NMB) or TIVA. Each case examined for the use of entropy, the response entropy (RE) and state entropy (SE) achieved, and the average time per case RE/SE remained either above 60 or below 40.

Results: A total of 82 participants met inclusion criteria. Entropy compliance was 100% with TIVA. Entropy was used on 45% of total patients requiring NMB. The median RE/SE achieved were 39 and 37. The average percentage of time RE/SE hovered above 60 was 7.6/6.5% with a fall below 40 at 46/51%. In older patients, entropy was used on 57% of patients requiring NMB, and the average percentage of time RE/SE fell below 40 was 54/63%.

Conclusions: Our study found excellent use of entropy with TIVA. The use of entropy in older patients with concomitant NMB was appropriately higher than the general population.

Keywords: Entropy; electroencephalography; total intravenous anaesthesia (TIVA); neuromuscular blockade (NMB); general anaesthesia

Acknowledgments

Funding: None.

Footnote

Conflicts of Interest: The authors have no conflicts of interest to declare.

Ethical Statement: The authors are accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.

Open Access Statement: This is an Open Access article distributed in accordance with the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License (CC BY-NC-ND 4.0), which permits the non-commercial replication and distribution of the article with the strict proviso that no changes or edits are made and the original work is properly cited (including links to both the formal publication through the relevant DOI and the license). See: https://creativecommons.org/licenses/by-nc-nd/4.0/.

doi: 10.21037/map-24-ab099
Cite this abstract as: Zhou Z, Rowe D, O’Regan D, Walsh A. AB099. SOH24AB_123. Spectral entropy in the operating theatre. Mesentery Peritoneum 2024;8:AB099.

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