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Unexpected entropy response to saline spraying at the end of posterior fossa surgery: a few cases report.
MedLine Citation:
PMID:  21919375     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
The Spectral Entropy proposed to monitor the depth of anesthesia includes the State Entropy (SE) computed from the EEG (0.8-32 Hz frequency band), and the Response Entropy (RE) computed from EEG and facial muscles activity (0.5-47 Hz frequency band). We report an unexpected Entropy response to saline spraying at the end of posterior fossa surgery. Six patients undergoing scheduled functional surgery of the posterior fossa were included in this report. They were anesthetized with propofol and remifentanil using TCI and received an intubation dose of rocuronium. At the end of surgery, saline spraying, performed for hemostatic purpose and wreckage elimination, resulted in a sustained increase in RE and SE without hemodynamic modification in four patients, while no change was observed in the two other ones. In one of the responding patients, 0.1 mg kg(-1) rocuronium attenuated the Entropy response. In the two non responders, repetition of spraying or rocuronium administration did not change Entropy value. Recovery from anesthesia was comparable in all patients and none of them complained from awareness. We conclude that Entropy can increase during posterior fossa surgery in non-paralyzed patients. This response probably reflects an increase in facial muscle activity rather than a change in depth of anesthesia, as far as it can be attenuated by a small dose of rocuronium. While this hypothesis requires further investigation, these observations suggest that saline spraying may confound interpretation of Entropy during posterior fossa surgery.
Authors:
M Clanet; V Bonhomme; L Lhoest; J D Born; P Hans
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Acta anaesthesiologica Belgica     Volume:  62     ISSN:  0001-5164     ISO Abbreviation:  Acta Anaesthesiol Belg     Publication Date:  2011  
Date Detail:
Created Date:  2011-09-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0421022     Medline TA:  Acta Anaesthesiol Belg     Country:  Belgium    
Other Details:
Languages:  eng     Pagination:  87-90     Citation Subset:  IM    
Affiliation:
Department of Anesthesia and ICM, CHR Citadelle, Liege, Belgium.
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