Effects Of Two Kinds Of Continuous Nerve Block On Respiratory Function Of Patients After Shoulder Arthroscopy

Objective(s):In order to compare the effect of continuous suprascapular nerve block and interscalene brachial plexus nerve block on respiratory function in analgesia after shoulder arthroscopy.Methods:Ethics committee approved,42 cases of subjects presenting for total shoulder arthroplasty,ASA ?-? level,randomly divided into the ISB and SSNB group.Patients were treated with epidural catheter placement and fixation by the side of suprascapular nerve(SSNB group)and brachial plexus(ISB group)under ultrasound guidance before general anesthesia induction,respectively.0.2%ropivacaine 6ml/h was infused.The diaphragmatic excursion(under ultrasound),lung capacity(VC),forced expiratory volume in the first second(FEV1),and the diaphragmatic excursion,VC,and FEV1 24h after surgery were observed and recorded respectively in the two groups.We used Student's t test and Chi-square/Fisher Exact test and used a statistical software to compare data.Results:A total of 41 patients(group SSNB,n=20;group ISB,n=21)completed the experiment,which indicated that postoperative lung capacity of ISB group patients decreased by 0.58 ± 0.26L,while that of SSNB group patients decreased by 0.28±0.15L,with statistically significant difference(P<0.05).The decrease of diaphragmatic excursion in SSNB group was significantly lower than that in ISB group(P<0.05),The same is true for FEV1.The difference of the dosages of tramadol 24h after operation in the two groups(ISB group 51.37±8.51mg;SSNB group 56.41±12.97mg)and average VAS score within 24h after surgery(ISB group 2.1;SSNB group 2.6)was not statistically significant(P>0.05);The ratio of brachial plexus blocked in ISB group was higher than that in SSNB group(P<0.05).Postoperative adverse reactions were lower in SSNB group than in ISB group.There was no significant difference in patient satisfaction between SSNB group and ISB group(P>0.05).Conclusion(s):The effect of continuous suprascapular nerve block on pulmonary function was smaller than that of continuous interscalene brachial plexus nerve block,and there was no significant difference in the analgesic effect after shoulder arthroscopy.