IJSR International Journal of Scientific Research 2277 - 8179 Indian Society for Health and Advanced Research ijsr-12-4-48184 Original Research Paper Evaluation Of Pulse-Oximetry Perfusion Index As A Tool For Assessment Of Efficacy Of Rescue Analgesia In Post Operative Patients Sanchita Sarma Borkataki Dr. Dr. Arbind Kumar Ray Dr. April 2023 12 4 01 02