IJSR International Journal of Scientific Research 2277 - 8179 Indian Society for Health and Advanced Research ijsr-10-9-36554 Original Research Paper COMPARATIVE STUDY OF BUTORPHANOL, FENTANYL AND NALBUPHINE IN ASSESSMENT OF PAIN USING VAS SCORE IN LAPROSCOPIC SURGERIES. Prachi Verma Dr. September 2021 10 9 01 02