Lidocaine for LESS Postoperative Shoulder Pain Alleviation

Objective: To evaluate the efficacy of subdiaphragmatic spray of 0.08% lidocaine in relieving postoperative acute pain and psychological status of patients undergoing single-port laparoscopic surgery for benign gynecological diseases, and to provide evidence-based basis for optimizing postoperative analgesic strategies. Methods: A single-center, prospective randomized controlled study was conducted. A total of 100 patients scheduled for elective single-port laparoscopic surgery due to uterine fibroids, ovarian cysts, or other benign gynecological conditions were selected from the General Gynecology Center of Peking Union Medical College Hospital. They were divided into the experimental group (n=50) and the control group (n=50) using a random number table. The experimental group received 50 ml of 0.08% lidocaine solution sprayed on the bilateral subdiaphragmatic regions at the start of surgery, while the control group underwent standard ERAS without any pharmaceutical intervention in the subdiaphragmatic area. The primary endpoint was the Numerical Rating Scale (NRS) score for resting pain at 6 hours postoperatively. The secondary endpoints included NRS scores at 1, 2, 12, and 24 hours postoperatively, total consumption of analgesics within 48 hours after surgery, incidence of adverse reactions, patient satisfaction, and scores of psychological and sleep scales (Distress Thermometer, GAD-7, etc.) at 30 days postoperatively. SPSS 25.0 software was used for data analysis. Quantitative data were analyzed by t-test or Mann-Whitney U test, and qualitative data were analyzed by χ² test or Fisher's exact test. Repeated measurement data were analyzed by repeated measures analysis of variance. Results: After the completion of the study, differences in NRS scores, analgesic consumption, psychological status and other indicators between the two groups will be compared. Conclusion: The results of this study will clarify the clinical value of intraoperative diaphragmatic infiltration with low-concentration lidocaine in postoperative analgesia after single-port laparoscopic gynecological surgery, and provide references for postoperative pain management and psychological intervention.