Objective To compare the effects of ultrasound guided serratus anterior plane block (SAPB) on lung function and immune function in patients undergoing thoracoscopic radical resection of lung cancer. Methods A total of 135 patients undergoing thoracoscopic surgery for lung cancer in the First Affiliated Hospital of Hebei North University from January 2020 to February 2023 were collected.According to the random number,patients were divided into three groups randomly:the control group (n=45) who only received general anesthesia, the ropivacaine group (n=45) who received local infiltration anesthesia with ropivacaine, and the SAPB group (n=45) who received SAPB. Clinical data and surgical data were compared among the three groups. The visual analogue scale (VAS) was used to assess pain during rest and coughing. The perioperative complications were also collected. Flow cytometry and corresponding reagents were used to detect the levels of T lymphocyte subsets before and after surgery, as well as the levels of serum carcinoembryonic antigen (CEA), carcinoembryonic antigen (CA) 125, cytokeratin 19 fragment 21-1 (CYFRA21-1), and neuron specific enolase (NSE). Results The amount of remifentanil used during operation in the ropivacaine group and the SAPB group was lower than that in the control group , the time of the first press on the patient control analgesia (PCA) pump was later than that in the control group, and the number of press on the PCA pump within 48 hours after operation was lower than that in the control group ,and the differences were all statistically significant (P<0.05).There were statistically significant differences in the level of VAS, CD3+ , CD4+ , CD8+ , and CD4+/CD8+ among three groups at different time points (all P<0.05). The level of CEA, CA125, CYFRA21-1 and NSE at 24 hours after surgery in the ropivacaine group and the SAPB group was lower than that in the control group (all P<0.05). The incidence of adverse reactions in three group was 15.56%, 4.44% and 4.44%, respectively, with no statistically significant difference (χ2=4.949,P=0.084). Conclusion SAPB can improve the analgesic effect after radical resection of lung cancer under thoracoscopy, regulate the immune function of patients and reduce the level of serum tumor markers. |