A Comparative Study of Interscalene Brachial Plexus Block by Nerve Stimulator Locating Different Brachial Plexus Branches

Objective: To compare the effects and safety of positioning way with neurostinulator on brachial plexus block. Methods: Eighty patients operated the upper limb were randomized into two groups( n = 40 each): Group A was guided by neurostinulator through locating radial nerve, median nerve, ulnar nerve; In group B, nerve stimulator was used to loccate musculocutaneous nerve. The two groups were given 1% lidocaine +0.375% Naropin 20 mL. Record time searching for a target neural and completing the operation, the onset of sensory nerve block and motor nerve block were measured; Record time that sensory nerve and motor nerve were blocked completedly and analgesia was rated as excellent, effective, poor and failure. Results: Group A completed the operation need the time( 5.01 ±1.40) min was significantly longer than the B group( 2.83 ±0.87) min( P0.01). Sensory block onset time of group A( 4.48± 1.36) min, was significantly shorter than the group B( 7 ±2.06) min( P0.01); group A motion block onset time( 4.88± 1.18) min was significantly shorter than that in the group B( 7 ±1.67) min( P0.01). Group A feel complete block time( 11.73± 3.62) is shorter than the group B( 13.33± 3.02) min( P=0.033).The time that motion nerve was blocked completedly in the group A( 11.18± 2.73) is shorter than the group B( 12.41± 2.48) min( P=0.038); anesthetic effect excellent rate was 87.5% in the group A, was 67.5% in the group B, there were statistically significant differences between A and B(x2=4.588, P=0.032); excellent and good rate of the group A was 97.5%, 90% in the group B, the difference was not statistically meaning in the two group(x2=1.920, P=0.166); Both two group had no severe complication of anesthesia. Conclusions: Group A is better than group B, it gets shorter onset time and more efficiency,but the operation time of the group A is more longer than the group B.