Response surface modeling of the interaction between propofol and sevoflurane

Schumacher, Peter M; Dossche, Jan; Mortier, Eric P; Luginbuehl, Martin; Bouillon, Thomas W; Struys, Michel M R F (2009). Response surface modeling of the interaction between propofol and sevoflurane. Anesthesiology, 111(4), pp. 790-804. Hagerstown, Md.: Lippincott Williams & Wilkins 10.1097/ALN.0b013e3181b799ef

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BACKGROUND: Propofol and sevoflurane display additivity for gamma-aminobutyric acid receptor activation, loss of consciousness, and tolerance of skin incision. Information about their interaction regarding electroencephalographic suppression is unavailable. This study examined this interaction as well as the interaction on the probability of tolerance of shake and shout and three noxious stimulations by using a response surface methodology. METHODS: Sixty patients preoperatively received different combined concentrations of propofol (0-12 microg/ml) and sevoflurane (0-3.5 vol.%) according to a crisscross design (274 concentration pairs, 3 to 6 per patient). After having reached pseudo-steady state, the authors recorded bispectral index, state and response entropy and the response to shake and shout, tetanic stimulation, laryngeal mask airway insertion, and laryngoscopy. For the analysis of the probability of tolerance by logistic regression, a Greco interaction model was used. For the separate analysis of bispectral index, state and response entropy suppression, a fractional Emax Greco model was used. All calculations were performed with NONMEM V (GloboMax LLC, Hanover, MD). RESULTS: Additivity was found for all endpoints, the Ce(50, PROP)/Ce(50, SEVO) for bispectral index suppression was 3.68 microg. ml(-1)/ 1.53 vol.%, for tolerance of shake and shout 2.34 microg . ml(-1)/ 1.03 vol.%, tetanic stimulation 5.34 microg . ml(-1)/ 2.11 vol.%, laryngeal mask airway insertion 5.92 microg. ml(-1) / 2.55 vol.%, and laryngoscopy 6.55 microg. ml(-1)/2.83 vol.%. CONCLUSION: For both electroencephalographic suppression and tolerance to stimulation, the interaction of propofol and sevoflurane was identified as additive. The response surface data can be used for more rational dose finding in case of sequential and coadministration of propofol and sevoflurane.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > Department of Intensive Care, Emergency Medicine and Anaesthesiology (DINA) > Clinic and Policlinic for Anaesthesiology and Pain Therapy
UniBE Contributor:	Schumacher, Peter
ISSN:	0003-3022
Publisher:	Lippincott Williams & Wilkins
Language:	English
Submitter:	Jeannie Wurz
Date Deposited:	04 Oct 2013 15:11
Last Modified:	05 Dec 2022 14:21
Publisher DOI:	10.1097/ALN.0b013e3181b799ef
PubMed ID:	19741484
Web of Science ID:	000270210100021
URI:	https://boris.unibe.ch/id/eprint/31284 (FactScience: 195731)