IJSR International Journal of Scientific Research 2277 - 8179 Indian Society for Health and Advanced Research ijsr-10-5-35175 Original Research Paper COMPARATIVE STUDY OF FENTANYL, BUTORPHANOL AND NALBUPHINE IN ATTENUATION OF HAEMODYNAMIC RESPONSES IN LAPAROSCOPIC CHOLECYSTECTOMY. Prachi Verma Dr. May 2021 10 5 01 02