IJSR International Journal of Scientific Research 2277 - 8179 Indian Society for Health and Advanced Research ijsr-13-12-60416 Original Research Paper Pulse Oximetry Perfusion Index Versus Perfusion Index Ratio, Better Tool For Evaluation Of Ultrasonography Guided Supraclavicular Brachial Block Success: A Comparative Study Tanvi Anand Dr. Dr. Deepshikha Dr. Dr. Abhikanksha Dr. December 2024 13 12 01 02