Yasuda I, Hirano T, Ojima T, Ohira N, Kaneko T, Yamamuro M
Br J Anaesth. 1980 Apr;52(4):409-11. doi: 10.1093/bja/52.4.409.
A technique employing a nerve stimulator and an insulated needle was used for supraclavicular brachial plexus block in 71 patients using 0.5% plain bupivacaine 15-20 ml. The mean minimal stimulating current to produce paraesthesia was 0.09 mA. The plexus was identified at a mean depth of 27 mm below the skin. The block was successful in 98% of patients when the stimulation was felt in the index, middle or ring finger, but was often incomplete when felt in the thumb or little finger.
