Effect Of Different Injection Speed Of 0.375% Ropivacaine On Postoperative Analgesia Of Posterior Approach Quadratus Lumbosus Block

Objective:To investigate the effect of different injection speeds of 0.375% ropivacaine on the analgesic effect of ultrasound-guided posterior approach quadratus lumbosus block.Methods :Sixty patients undergoing laparoscopic Dixon rectal cancer radical resection under elective general anesthesia were enrolled.The gender range was 35-70 years old,BMI was 18-30 kg/m2,and ASA grade I or II was divided into two groups by random number table.(n=30): high speed group(group H)and low speed group(group L).Ultrasound-guided bilateral posterior approach quadratus lumbosus block was induced by general anesthesia.Each of the H and L groups was intramuscularly injected with 20 ml of 0.375% ropivacaine at an injection rate of 40 ml/min and 20ml/min.All patients underwent PCIA after operation,and the visual analogue scale of pain(VAS score)was ?3 points.The amount of sufentanil in the two groups,the resting and exercise VAS scores at 4,8,12,and 24 h after surgery were recorded.The first time of analgesia pump,the dose of sufentanil,and the number of remedial analgesia were recorded.Postoperative analgesia satisfaction.Results :Compared with the L group,the dose of sufentanil was significantly reduced in the H group.The resting and exercise VAS scores were significantly lower at 4,8,12,and 24 h after surgery and the dosage of sufentanil was significantly reduced(P<0.05).The initial compression time of the analgesia pump was significantly prolonged.the dosage of sufentanil was significantly reduced(P<0.05),the number of remedial analgesia was significantly reduced,and the satisfaction of postoperative analgesia was significantly increased(P<0.05).Conclusion:When the posterior approach of 0.375% ropivacaine for quadratus lumbosusblockoperation,the injection speed of 40ml/min is better than 20ml/min,the former has better postoperative analgesic effect.