Pre-mixed nitrous oxide-oxygen analgesia in the ambulance service.
D000698:Analgesia; D001294:Attitude to Health; D003243:Consciousness / Q000187:drug effects; D006801:Humans; D009609:Nitrous Oxide / Q000009:adverse effects; D010100:Oxygen; D014187:Transportation of Patients
D009609:Nitrous Oxide; D010100:Oxygen