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.
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Change in Perfusion Index ratio
Timeframe: 15 minutes
Change in End Diastolic Velocity ratio
Timeframe: 15 minutes