title: Test-doses in extradural analgesia.
mesh_terms: D000328:Adult; D000767:Anesthesia, Epidural / Q000009:adverse effects / Q000379:methods*; D000773:Anesthesia, Obstetrical / Q000009:adverse effects / Q000379:methods*; D002585:Cesarean Section; D005260:Female; D006801:Humans; D011247:Pregnancy; D013997:Time Factors