The estimation of inspired desflurane concentration in a low-flow system |
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| Authors: | S. GOWRIE-MOHAN V. MURALITHARAN G. G. LOCKWOOD |
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| Affiliation: | S. Gowrie-Mohan, MB, BS, FRCA, Senior Registrar, V. Muralitharan, MB, BS, FFARCSI, Senior Registrar, G.G. Lockwood, BSc, MB, BS, FRCA, Senior Lecturer, Department of Anaesthesia, Hammersmith Hospital, Du Cane Road, London W12 OHS. |
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| Abstract: | We have examined the predictability of inspired desflurane concentration during low-flow anaesthesia using a to-and-fro breathing system. Twenty-two adult patients requiring mechanical ventilation of the lungs during surgery took part in the study. Using a fresh gas flow of 1 l.min1, the ratio of inspired desflurane concentration to desflurane vaporizer setting was found to be approximately 0.75 after 9 min of anaesthesia and at 2 l.min1 fresh gas flow the ratio was approximately 0.9 after 2 min of anaesthesia. These ratios were maintained throughout the procedure, except for a few minutes following each change in vaporizer setting. |
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| Keywords: | Anaesthetics, volatile desflurane. Equipment breathing systems, closed |
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