Time to abandon loss of resistance to air.
Yentis
S M
SM
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