Clinical Study of Bupivacaine Combined with Morphine Applied in Brachial Plexus Block

To observe the effect of bupivacaine combined with morphine applied in brachial plexus block and postoperative analgesia, and then to investigate the mechanism of anesthesia and analgesia for morphine. Methods: 50 patients with ASA I -II were randomly divided into two groups. 0.375 % bupivacaine was used in A group, while in B group , 2mg morphine was combined with 0.375% bupivacaine.The above drugs (25 ~ 35ml) were adopted for brachial plexus block. The onset time, the time for whole blocking and the duration of anesthesia and postoperative analgesia were observed. Results: The effect of anesthesia and postoperative analgesia in B group was obviously superior to that of A group. Conclusion: Besides in the central nerve system, there are also opioid receptor in peripheral nerve system.