title: Letter: Patient-controlled intravenous narcotic administration during labour.
mesh_terms: D000771:Anesthesia, Intravenous; D000773:Anesthesia, Obstetrical; D005260:Female; D005333:Fetus / Q000187:drug effects; D006801:Humans; D007231:Infant, Newborn; D008431:Maternal-Fetal Exchange; D008614:Meperidine / Q000008:administration & dosage*; D011247:Pregnancy
chemical_list: D008614:Meperidine