title: Time to abandon loss of resistance to air.
authors.forename: S M
authors.initials: SM
authors.lastname: Yentis
mesh_terms: D000388:Air; D000399:Air Pressure; D000767:Anesthesia, Epidural / Q000009:adverse effects*; D000773:Anesthesia, Obstetrical / Q000009:adverse effects*; D005260:Female; D006801:Humans; D007268:Injections, Epidural / Q000009:adverse effects; D011247:Pregnancy