Obstetric analgesia. The use of a fixed nitrous oxide and oxygen mixture from one cylinder.
D000698:Analgesia; D016362:Analgesia, Obstetrical; D000758:Anesthesia; D000760:Anesthesia and Analgesia; D000773:Anesthesia, Obstetrical; D005260:Female; D006801:Humans; D009609:Nitrous Oxide; D009774:Obstetrics; D010100:Oxygen; D059408:Pain Management; D011247:Pregnancy
D009609:Nitrous Oxide; D010100:Oxygen
ANESTHESIA, OBSTETRICAL; NITROUS OXIDE/anesthesia and analgesia