Analgesia effect of magnesium sulfate in ultrasound-guided interscalene brachial plexus block in limb sur-gery / 临床麻醉学杂志

ABSTRACT

Objective To observe the anesthesia and analgesia effect of ultrasound guided inter-scalene brachial plexus block (ISPSP)on upper extremity surgery.Methods Fifty-four patients (male 34 cases,female 20 cases,aged 37-73 years,ASA grade Ⅰ or Ⅱ)scheduled for elective upper limb surgery under ISPBP combined with general anesthesia were randomly assigned into two groups:magnesium sulfate group (group M,n =27)and control group (group N,n =27).0.5% ropivacaine 8ml (40 mg)+10% magnesium sulfate 2 ml (0.5 g)were used in group M ,0.5% ropivacaine 8 ml+ normal saline 2ml (40 mg)were used in group N.After the effects of ISBPB were confirmed,pa-tients were inserted laryngeal mask under intravenous induction.Anesthesia was maintained by inha-ling sevoflurane(MAC 0.8)during the operation.The onset time of sensory and motor block,duration of sensory and motor block,duration of analgesia,pain visual analogue digital score (VAS)4,8,12, 24 hours after operationand complications were recorded.Results Duration of sensory block and du-ration of analgesia of group M was significantly longer than those of group N (P <0.05).The patient`s VAS score of 8,12,24 hours after surgery in group M was significantly lower than that on group N (P <0.05).Onset time of sensory and motory block of both groups was similar.Conclusion 0.5%ropivacaine combined with magnesium sulfate in ultrasound-guided ISPBP can extend the duration of sensory block,reduce postoperative pain,as well as prolong analgesia time.