[Epidural residual pressure and spread of analgesia in epidural anesthesia].
D000328:Adult; D000367:Age Factors; D000368:Aged; D000767:Anesthesia, Epidural; D004388:Dura Mater / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011312:Pressure