%0 Journal Article %T Comparative study of epidural bupivacaine with butorphanol and bupivacaine with tramadol for postoperative pain relief in abdominal surgeries %A Mukesh I. Shukla %A N. Ashwini %A N. Swathi %J Archive of "Anesthesia, Essays and Researches". %D 2016 %R 10.4103/0259-1162.177522 %X To compare the efficacy of combination of epidural local anesthetic with tramadol and butorphanol in major abdominal surgeries %K Butorphanol %K epidural %K tramadol %U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5062192/