title: Letter: Horner's syndrome following obstetric extradural block analgesia.
mesh_terms: D000293:Adolescent; D000767:Anesthesia, Epidural / Q000009:adverse effects*; D000773:Anesthesia, Obstetrical / Q000009:adverse effects*; D002045:Bupivacaine / Q000009:adverse effects*; D005260:Female; D006732:Horner Syndrome / Q000139:chemically induced*; D006801:Humans; D011247:Pregnancy
chemical_list: D002045:Bupivacaine