Clinical observation of Butorphanol preemptive analgesia for brachial plexus nerve block

Objective To observe the effects of Butorphanol preemptive analgesia on brachial plexus nerve block.Method Total 60 cases of elective thyroid surgery were randomly divided into two groups,30 cases in each group.Group A and group B were injected butorphanol tartrate(1 ml) and placebo(1 ml),respectively,5 min later both were blocked with 0.375%levobupivacaine card in brachial plexus. Intraoperative blood pressure,heart rate,pulse,oxygen saturation,sensory block onset time,motor block onset time,duration of sensory block,motor block duration,anesthesia duration,operative time,evaluation of anesthesia and postoperative pain score at different time points were recorded.The incidence of adverse reactions as postoperative nausea,vomiting,dizziness,headache,chills,etc within 24 h were recorded. Results Sensory block,motor block duration and the duration of analgesia in group A were significantly longer than group B(P 0.01).Postoperative 4,8,12,24 h VAS score in group A were significantly lower than group B(P 0.01).Conclusion Butorphanol has the exact preemptive analgesia effects,can enhance the effect of levobupivacaine in brachial plexus block,extend the time for postoperative analgesia,with low incidence of adverse reactions,and it is worthy of clinical use.