Specifications and recommendations for nitrous oxide-oxygen apparatus to be used in obstetric analgesis.
D000698:Analgesia; D000773:Anesthesia, Obstetrical / Q000295:instrumentation* / Q000592:standards; D005260:Female; D006801:Humans; D008880:Midwifery; D009609:Nitrous Oxide; D010100:Oxygen; D011247:Pregnancy
D009609:Nitrous Oxide; D010100:Oxygen