IJSR International Journal of Scientific Research 2277 - 8179 Indian Society for Health and Advanced Research ijsr-12-6-50463 Original Research Paper A Study Comparing The Efficacy Of Premixed Versus Sequential Administration Of Fentanyl And Bupivacaine In Subarachnoid Block For Below Umbilical Surgeries Devendra Kumar Dr. Dr. Archana Tripathi Dr. June 2023 12 6 01 02