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Updated: Jul 11, 2026

Use of an Integrated Low-Flow Anesthetic Vaporizer, Ventilator, and Physiological Monitoring System for Rodents
Published on: July 9, 2020
Improving the efficiency of the drawover anaesthetic breathing system
1Department of Anaesthesia, Gloucestershire Royal Hospital, Great Western Road, Gloucester, Gloucestershire GL1 3NN, UK. mikeeales99@hotmail.com
Abstract:
We investigated modifications to the reservoir tube usually used in drawover anaesthetic breathing systems as a method of improving its efficiency and performance. The resulting oxygen concentration was recorded at different oxygen flow rates whilst an artificial lung was being ventilated over a range of minute volumes. Addition of a reservoir bag and valves significantly increased the measured percentage of oxygen at the common gas outlet when compared to a 300-ml reservoir tube. There was no difference in the percentage of oxygen when comparing a reservoir bag and a 600-ml reservoir tube.
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