RT Journal Article SR Electronic T1 The efficacy of ephedrine during spinal anesthesia with hyperbaric ropivacaine: 134. JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 28 OP 28 DO 10.1053/rapm-00115550-200309001-00048 VO 28 IS Suppl 1 A1 T Erdogan YR 2003 UL http://rapm.bmj.com/content/28/Suppl_1/28.1.abstract AB