IJSR International Journal of Scientific Research 2277 - 8179 Indian Society for Health and Advanced Research ijsr-10-1-32979 Original Research Paper Efficacy of Intrathecal Buprenorphine with Bupivacaine 0.5% and Fentanyl with Bupivacaine 0.5% in lower abdominal surgeries - A Comparative study R Dr. January 2021 10 1 01 02