Perfusion Index and End Diastolic Velocity Ratios as Predictors of Supraclavicular Block Success in Vascular Access Surgery

This is a prospective observational study investigating the correlation between Perfusion Index (PI) ratio and End Diastolic Velocity (EDV) ratio as early predictors of successful supraclavicular brachial plexus block (SCBPB) in patients undergoing superficialization surgery of the upper limb.