An unusual failure of an oxygen fail-safe device.
D000769:Anesthesia, Inhalation / Q000009:adverse effects / Q000295:instrumentation*; D002763:Cholecystectomy; D006801:Humans; D009609:Nitrous Oxide; D010100:Oxygen; D011482:Protective Devices
D009609:Nitrous Oxide; D010100:Oxygen