IJSR International Journal of Scientific Research 2277 - 8179 Indian Society for Health and Advanced Research ijsr-10-3-33904 Original Research Paper A COMPARATIVE STUDY OF EFFICACY OF ERECTOR SPINAE PLANE (ESP) BLOCK FOR POST-OPERATIVE ANAELGESIA BY 0.2% ROPIVACAINE IN LUMBAR SPINE SURGERY Rana Dr. Priti Banerjee Dr. March 2021 10 3 01 02