title: Failure to cannulate the epidural space.
authors: A
authors: A
authors: Vohra
authors: B J
authors: BJ
authors: Pollard
mesh_terms: D000328:Adult; D000767:Anesthesia, Epidural / Q000295:instrumentation*; D000773:Anesthesia, Obstetrical / Q000295:instrumentation*; D002404:Catheterization / Q000295:instrumentation*; D004824:Epidural Space; D004868:Equipment Failure; D005260:Female; D006801:Humans; D009339:Needles / Q000009:adverse effects; D011247:Pregnancy