In this study 100 patients scheduled for upper limb surgery and suitable for ICB were randomly allocated to 1 of 5 groups : group NS ( NS alone group 0.5 ml/kg LA ) , group FD ( full-dose US group 0.5 ml/kg LA ) , group 30 ( 30 % reduced dose LA 0.35 ml/kg ) , group 50 ( 0.25 ml/kg LA ) and group 70 ( 0.15 ml/kg LA ) .