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British Journal of Anaesthesia, 1988, Vol. 60, No. 1 56-63
© 1988 The Board of Management and Trustees of the British Journal of Anaesthesia

research-article

COMPARISON OF THE EFFECTS OF SUBANAESTHETIC CONCENTRATIONS OF ISOFLURANE OR NITROUS OXIDE IN VOLUNTEERS

I. M. MCMENEMIN, M.B., CH.B., F.F.A.R.C.S.* and G. D. PARBROOK, M.D., F.F.A.R.C.S.

University Department of Anaesthesia, Royal Infirmary, 8–16 Alexandra Parade Glasgow G31 2ER.

Correspondence to G.D.P.

A cross-over trial was performed in 12 volunteers to compare the relative potency of 25% nitrous oxide and 0.4% isoflurane when breathed for a period of 20 min. Oxygen was used as a control. The effects were observed for 35 min after drug administration. Choice reaction time, ability to tap two areas on a board and ability to perform mathematical problems were significantly impaired when inhaling nitrous oxide, the maximum effect being obtained within 5 min. With isoflurane, the effects were significantly greater than with nitrous oxide. The effect obtained after 15 min inhalation was greater than that at 5 min. Tests returned promptly to the base line after the discontinuation of the test agent. Subjective assessments were made using a series of eight visual analogue scales. Results of the scales represented by physical and mental sedation indicated that 0.4% isoflurane was more potent than 25% nitrous oxide. Significant effects were detected up to 15 min after the inhalation of the agent was stopped. Subanaesthetic concentrations of isoflurane warrant further study in patients undergoing dental treatment in which a rapid recovery from sedation is important.

*Present address: Department of Anaesthesia, Western Infirmary, Dumbarton Rd, Glasgow G11 6NT.


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