[Mixtures of gases in analgesia during labor].
D000773:Anesthesia, Obstetrical; D000777:Anesthetics / Q000008:administration & dosage*; D005260:Female; D006801:Humans; D010100:Oxygen / Q000008:administration & dosage*; D011247:Pregnancy
D000777:Anesthetics; D010100:Oxygen
Misturas de gases para analgesia no paro.