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Medical Definition of Closed anaesthesia
1. Inhalation anaesthesia in which there is total rebreathing of all exhaled gases, except carbon dioxide which is absorbed; gas flow into the anaesthetic circuit consists only of oxygen, in amounts equal to the patient's metabolic consumption, plus small amounts of other gases (e.g., nitrous oxide) which undergo continued uptake by and distribution in the patient. (05 Mar 2000)