Abstract: ［Abstract］  Objective〖HTSS〗〓To observe the clinical effect of coracoid approach brachial plexus block for upper extremity surgery by using  a nerve stimulator.
〖HTH〗〖WTHZ〗Methods〖HTSS〗〓Eighty patients ASA classⅠ-Ⅱscheduled for surgery in elbow, forearm, wrist or hand were randomly divided into two group: coracoid approach group(group A) and axillary approach group(group B), 40 patients in each group. All cases were carried out coracoid approach or axillary brachial plexus block using a nerve stimulator. 40 mL 0.375% ropivacaine was injected after successful localization. Sensory block and motor block was evaluated every 5 minutes after the end of injection of the local anesthetic. The processing time required to complete the block、success rate and complications were also tanked notes.
〖HTH〗〖WTHZ〗Results〖HTSS〗〓There was no significant difference between the two groups in duration of operation and processing time for block(P＞005).  The onset time of sensory block for median nerve, musculocutaneous nerve and onset time of global sensory block in group A were significantly shorter than that in group B(P＜005). The onset time of sensory block for ulnar nerve, radial nerve and medial antebrachial cutaneous nerve in the two groups had no significant difference(P＞005). The onset time of motor block for median nerveand onset time of global motor block in group A were significantly shorter than that in group B(P＜005). The onset time of motor block for ulnar nerve and radial nerve in the two groups had no significant difference(P＞005). The rate of successful block in group A was significantly higher than that in group B(P＜005), and the rate of tourniquet pain in group A was significantly lower than that in group B(P＜005).
〖HTH〗〖WTHZ〗Conclusion〖HTSS〗〓Coracoid approach brachial plexus block is simple and safe guided by nerve stimulator. It requires shorter onset times and produces more perfect anesthesia effect. It is an favorable approach of brachial plexus block.

Key words: nerve block, brachial plexus, upper extremity, surgical procedures, operative