Objective To investigate the effects of continuous wound infusion of ropivacaine for postoperative analgesia on local inflammation.Methods Forty ASA Ⅰ or Ⅱ patients,aged 45-64 yr,weighing 45-80 kg,undergoing simple nephrectomy,were randomized into either continusous wound infusion of local anesthetic group ( group CWI ) or control group ( group C),with 20 cases each.Group CWI were treated with continuous wound infusion of 0.25％ ropivacaine for postoperative analgesia,while group C were infused with the same volume of normal saline.All patients received patient-controlled analgesia with intravenous morphine.At 6,12,24 and 48 h after operation,the accumulated consumption of morphine was documented,and the concentration of prostaglandinE2 (PGE2) of drainage was determined using ELISA.Results Compared with group C,the accumulated consumption of morphine was decreased,and the PGE2 concentration was decreased in group CWI at each time points.Conclusion The mechanism of postoperative analgesic effect of continuous wound infusion of ropivacaine is related to the suppression of local inflammation in wound sites.

Objective To compare the efficacy and safety in patients received paravertebral block and epi-dural block for postoperative rehabilitation pain after unilateral ureterolithotomy.Methods 120 ASA Ⅰor Ⅱ patients were randomly allocated into research group (n =60)and control group (n =60).After operation,the research group received paravertebral block performed with peripheral nerve stimulator,the control group received epidural block.All patients received patient -controlled intravenous analgesia (PCIA)in the same time.The operation time,amount of bleeding,postoperative hospitalization time,operation completion,number of press PCIA,occurrence rate of postopera-tive adverse reaction in 48 h,and visual analog scores (VAS)at 4,8,16 and 24 h after surgery were recorded. Results The patients of the two groups were completed the stone surgery,there was no cases of conversion to open surgery.There was no significant difference in operation time,bleeding volume,postoperative hospital stay between the two groups (all P >0.05).But the PCIA times of the research group was (2.14 ±0.45)times,which of the control group was (4.20 ±0.68)times,the difference was statistically significant (t =4.27,P =0.029).The postoperative VAS scores of the research group[4 h (2.68 ±0.480)points,8 h (2.68 ±0.48)points,16 h (2.81 ±0.43) points,24 h (2.88 ±0.49)points]were significantly lower than those of the control group[(3.12 ±0.53)points, (3.37 ±0.58)points,(3.42 ±0.52)points,(3.39 ±0.55)points],the differences were statistically significant (t =2.68,3.13,306,311,all P <0.05).Of the research group,the nausea and vomiting occurred rate (23.33%), hypotension rate (0.00%),skin itching (5.00%),the incidence of decreased muscle strength (0.00%)were significantly lower than the control group(43.3%,31.6%,28.33% and 8.33%),the differences were statistically significant(χ2 =5.40,22.57,11.76,522,all P <0.05 ).Conclusion Nerve stimulator guidance for thoracic paravertebral nerve block for upper ureter incision to take stone surgery patients can significantly reduce postoperative pain and the PCIA analgesia drug dosage and the incidence of adverse reactions.

Objective To investigate the safety and effectiveness of thoracic paravertebral nerve block on radiofrequency ablation of liver tumors. Methods A total of 40 patients underwent radiofrequency ablation of liver tumor, were ran-domly divided into target-controlled infusion group(group G,n=20)and paravertebral nerve block group (group P,n=20). The intraoperative vital signs, anesthesia effects,anesthesia work time, total operation time,postanesthesia care unit stay time, major adverse clinical events and postoperative VAS scores of two groups were recorded and compared. Results The anesthesia satisfactory rate of G group was 95% and P group was 100%. After anesthesia induction MAP,HR,SPO2 and R declined significantly in group G. Compared with group G,intraoperative vital signs were more stable in group P. Major adverse clinical events in group P were less than group G (P<0.05). The effecting time in group P was longer than group G. The postanesthesia care unit stay time was longer in group G than group P(P<0.05). The post-operative VAS scores in group P declined much more than those in group G before 24 hours postoperatively(P<0.05). Conclusion Thoracic paravertebral nerve block for anesthesia in liver tumors underwent radiofrequency ablation is safe and effective.