IJSR International Journal of Scientific Research 2277 - 8179 Indian Society for Health and Advanced Research ijsr-10-5-35199 Original Research Paper Comparison of Intrathecal Fentanyl-bupivacaine and Tramadol-bupivacaine Combination on Postoperative Analgesia in Lower Abdominal Surgeries Rakesh Singh Baghel Dr. May 2021 10 5 01 02