title: Self-administered intermittent nitrous oxide analgesia for labour. Enhancement of effect with continuous nasal inhalation of 50 per cent nitrous oxide (Entonox).
mesh_terms: D000769:Anesthesia, Inhalation / Q000379:methods*; D000773:Anesthesia, Obstetrical / Q000379:methods*; D002986:Clinical Trials as Topic; D004311:Double-Blind Method; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D009609:Nitrous Oxide / Q000008:administration & dosage*; D009666:Nose; D011247:Pregnancy; D011897:Random Allocation; D012646:Self Administration; D013997:Time Factors
chemical_list: D009609:Nitrous Oxide