Maternal and fetal response to the intrapartum use of butorphanol.
D000771:Anesthesia, Intravenous; D000773:Anesthesia, Obstetrical; D002077:Butorphanol; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008431:Maternal-Fetal Exchange / Q000187:drug effects*; D009019:Morphinans; D011247:Pregnancy
D009019:Morphinans; D002077:Butorphanol