Nitrous oxide and low inflow circle systems.
D000293:Adolescent; D000328:Adult; D000769:Anesthesia, Inhalation; D002648:Child; D006801:Humans; D008433:Mathematics; D008875:Middle Aged; D009609:Nitrous Oxide; D010100:Oxygen; D010101:Oxygen Consumption
D009609:Nitrous Oxide; D010100:Oxygen