title: Letter: Patient-controlled intravenous narcotic.
mesh_terms: D000700:Analgesics / Q000008:administration & dosage*; D000773:Anesthesia, Obstetrical; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007273:Injections, Intramuscular; D007275:Injections, Intravenous; D008431:Maternal-Fetal Exchange; D008614:Meperidine / Q000008:administration & dosage / Q000097:blood; D011247:Pregnancy
chemical_list: D000700:Analgesics; D008614:Meperidine