'Closed circuit' anaesthesia.
D000042:Absorption; D000769:Anesthesia, Inhalation / Q000295:instrumentation; D000777:Anesthetics / Q000008:administration & dosage*; D002118:Calcium; D002245:Carbon Dioxide; D006221:Halothane; D006801:Humans; D009584:Nitrogen; D009609:Nitrous Oxide; D010100:Oxygen; D012119:Respiration; D012972:Sodium Hydroxide
D000777:Anesthetics; D002245:Carbon Dioxide; D012972:Sodium Hydroxide; D009609:Nitrous Oxide; D009584:Nitrogen; D010100:Oxygen; D002118:Calcium; D006221:Halothane