title: Comparison between nitrous oxide and methoxyflurane for obstetrical analgesia.
mesh_terms: D000328:Adult; D000773:Anesthesia, Obstetrical; D001034:Apgar Score; D002986:Clinical Trials as Topic; D005260:Female; D006801:Humans; D007743:Labor, Obstetric; D008733:Methoxyflurane / Q000009:adverse effects; D009609:Nitrous Oxide / Q000009:adverse effects; D010100:Oxygen; D010146:Pain / Q000188:drug therapy; D011247:Pregnancy; D012138:Respiratory Therapy
chemical_list: D008733:Methoxyflurane; D009609:Nitrous Oxide; D010100:Oxygen