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Objective   The effectiveness of axillary brachial plexus block (ABPB) performed using peripheral nerve stimulation (PNS) alone was compared with PNS preceded by nerve localization using a pen device, enabling nerve mapping without puncturing the skin.Methods   Patients undergoing unilateral hand or forearm surgery suitable for ABPB were randomly assigned to receive either PNS alone (pen − group) or PNS preceded by nerve localization using a pen device (pen + group). Parameters related to the block procedure and patient comfort were assessed.Results   Thirty patients were included in each group. The block performance time was longer in the pen + group than the pen − group despite a reduced number of needle insertions. The complete block rate was higher and intraoperative analgesic usage lower in the pen + group compared with the pen − group. Patient satisfaction and complication rates were similar in the two groups.Conclusion   The pen device seems to be a helpful addition to PNS for ABPB, with improved results in terms of block success and patient comfort, but further studies are needed to confirm these findings.

Effect of nerve localization using a pen device on the success of axillary brachial plexus block