Objective  To exploxe the analgesic effect of general anesthesia combined with different concentrations of ropivacaine and transverse abdominis plane block  on laparoscopic appendectomy (LA).

Methods  LA patients from Xiamen University Affiliated Zhongshan Hospital from January 2022 to July 2023 were included. All patients underwent general anesthesia combined ropivacaine plane block of the transverse abdominis muscle. According to the different concentrations of ropivacaine, patients were divided into high concentration group (0.50%, 20 mL), medium concentration group (0.375%, 20 mL) and low concentration group (0.25%, 20 mL). The dosage of fentanyl, postoperative bleeding, time of first press of the analgesic pump, and number of presses among three groups of patients were recorded and compared. The postoperative vital signs (mean arterial pressure and heart rate), pain level (NRS), comfort level (BCS) (1 h, 6 h, 12 h, and 24 h), and incidence of postoperative adverse reactions were observed and compared.

Results  This study included a total of 90 LA patients, with 30 cases in each group. The first press of the analgesic pump in the low concentration group was significantly shorter than that in the medium and high concentration groups (P<0.05), while the number of presses was significantly higher than the other two groups (P<0.05). The mean arterial pressure and heart rate significantly decreased with the increase of ropivacaine concentration at 1 hour after surgery (P<0.05); compared with 1 hour after surgery, the average arterial pressure and heart rate of patients in the medium concentration group and low concentration group significantly increased at 6 hours after surgery (P<0.05), and no significant changes occurred thereafter. The NRS scores of patients in the high concentration group were significantly lower than those in the medium and low concentration groups at all four postoperative time points (P<0.05); the NRS scores of patients in the medium concentration group were significantly lower than those in the low concentration group at four postoperative time points (P<0.05). The BCS scores of the low concentration higher than those of the medium concentration group and low concentration group an 1 h, 6 h and 24 h. The incidence of adverse reactions in the high concentration group was significantly higher than that in the low concentration group and the medium concentration group (P<0.05); there was no significant difference in the incidence of adverse reactions between the medium concentration group and the low concentration group (P>0.05).

Conclusion  General anesthesia combined with 0.50% ropivacaine abdominal transverse muscle plane block has a significant analgesic effect and high comfort for patients undergoing LA, but the risk of postoperative adverse reactions is high, and the plan needs to be adjusted according to the actual situation.

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