title: [Clinical study: the effects of inhaling nitrous oxide for analgesia labor on pregnant women and fetus].
abstract: OBJECTIVE
  To investigate the effect of the inhalation of nitrous oxide premixed with oxygen (50%:50%) for analgesia labor on maternal and fetus.
  
  
  METHODS
  A total of 100 cases of pregnant women were provided with nitrous oxide premixed with oxygen (50%:50%) (control group); Another 100 cases were provided only with oxygen (comparison group). Recording duration of the Labor, way of delivery, bleeding volume, Apgars score, blood gas analysis to maternal radius artery and fetal umbilical blood among all patients.
  
  
  RESULTS
  The effect for analgesia labor of the premixed gas was much better than that of control group, but there were no significant differences in time of labor, bleeding volume, Apgars score between the two groups.
  
  
  CONCLUSIONS
  The inhalation of nitrous oxide premixed with oxygen (50%:50%) for analgesia labor benefits pregnant women because of keeping them being a good mental and physical condition. The inhalation of nitrous oxide for analgesia labor is a safe, effective and easy method.
authors.affiliation: Department of Obstetric and Gynecology, Second Municipal People's Hospital of Guangzhou, Guangzhou 510150, China.
authors.forename: X
authors.initials: X
authors.lastname: Ou
authors.forename: B
authors.initials: B
authors.lastname: Li
authors.forename: H
authors.initials: H
authors.lastname: Du
mesh_terms: D000328:Adult; D016362:Analgesia, Obstetrical; D005260:Female; D005333:Fetus / Q000187:drug effects*; D006801:Humans; D007743:Labor, Obstetric / Q000187:drug effects*; D009609:Nitrous Oxide / Q000494:pharmacology*; D010100:Oxygen / Q000494:pharmacology; D011247:Pregnancy
chemical_list: D009609:Nitrous Oxide; D010100:Oxygen