Why the study?
What is the predictability of inspired desflurane concentration during low-flow anaesthesia using a to-and-fro breathing system in adult surgical patients?
What is the predictability of inspired desflurane concentration during low-flow anaesthesia using a to-and-fro breathing system in adult surgical patients?
The inspired desflurane concentration can be predictably estimated from the vaporizer setting during low-flow anesthesia using a to-and-fro breathing system.
May support estimating inspired desflurane from vaporizer settings in low-flow to-and-fro systems; leaves open validation before clinical adoption.
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.min-1, 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.min-1 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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Gowrie‐Mohan et al. (1996) studied this question.
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