Somatic movement and oesophageal motility during isoflurane anaesthesia.

Mather, C; Raftery, S; Prys-Roberts, C · Br J Anaesth · 1992

other · Level V

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Abstract

The quantal responses for somatic movement, and spontaneous and provoked lower oesophageal contractions (motility) were noted at the time of incision in 72 patients aged 40-65 yr, receiving varying concentrations of isoflurane. Probit analysis of the alveolar concentration of isoflurane required to prevent somatic movement revealed an MAC or EC50 (95% confidence limits) of 1.00 (0.82-1.17)% and EC95 of 2.16 (1.69-3.89)%. The EC50 of isoflurane to suppress spontaneous lower oesophageal contractions was 1.27 (1.12-1.43)%, and the EC95 2.13 (1.78-3.22)%. The EC50 for provoked lower oesophageal contractions was 1.31 (0.93-3.48)% and the EC95 was 6.18% (unable to compute confidence limits).

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