title: Letter: Lateral thinking in topping up epidurals.
mesh_terms: D000767:Anesthesia, Epidural / Q000379:methods*; D000773:Anesthesia, Obstetrical / Q000379:methods*; D002045:Bupivacaine; D005260:Female; D006801:Humans; D011187:Posture; D011247:Pregnancy
chemical_list: D002045:Bupivacaine