FAILURES OF SACRAL EPIDURAL ANALGESIA.
D000698:Analgesia; D015360:Analgesia, Epidural; D000758:Anesthesia; D000775:Anesthesia, Spinal; D001416:Back Pain; D003287:Contrast Media; D006801:Humans; D010146:Pain; D011859:Radiography; D012445:Sacrococcygeal Region; D013115:Spinal Canal; D013129:Spinal Puncture
D003287:Contrast Media
ANALGESIA; ANESTHESIA, SPINAL; BACKACHE; CONTRAST MEDIA; RADIOGRAPHY; SACROCOCCYGEAL REGION; SPINAL CANAL; SPINAL PUNCTURE