RT Journal Article SR Electronic T1 Is There an Anatomical Explanation for Tachyphylaxis in Epidural Anesthesia? JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 16 OP 16 DO 10.1136/rapm-00115550-199924031-00016 VO 24 IS Suppl 1 A1 Elisabet U.M. Nyström A1 Charles W. Buffington YR 1999 UL http://rapm.bmj.com/content/24/Suppl_1/16.abstract AB