Abstract:Objective To explore the application of remimazolam in transversus abdominis plane block (TAPB) anesthesia for patients undergoing laparoscopic radical resection of colorectal cancer.Methods A total of 70 patients who underwent laparoscopic radical resection of colorectal cancer in this hospital from January 2023 to January 2025 were selected and divided into Group A (TAPB anesthesia, 35 cases) and Group B (remimazolam besylate + TAPB anesthesia, 35 cases) by random number table method. All patients were observed until discharge. The perioperative index, hemodynamic indicators, immune indicators, stress indicators, pain scores and mini mental state examination (MMSE) scores of the two groups were compared.Results Compared with Group A, Group B had shorter first exhaust time, hospital stay, time to get out of bed and move around, time to stay in the postanesthesia care unit (PACU), and recovery time, the differences were statistically significant (P 0.05). Compared with before anesthesia (T1), the mean arterial pressure (MAP) and heart rate (HR) in both groups were decreased immediately before intubation (T2), 1 minute after intubation (T3), and 3 minutes after intubation (T4), but group B was significantly higher than group A, and the differences were statistically significant (P 0.05). Compared with time point T1, the levels of serum cortisol (Cor) and norepinephrine (NE) at the end of the operation in both groups increased, but those in group B were significantly lower than those in group A. The levels of peripheral blood CD3+, CD4+ and CD8+ all decreased, but the level of peripheral blood CD8+ in group B was significantly lower than that in group A, and the levels of peripheral blood CD3+ and CD4+ were significantly higher than those in group A. The differences were all statistically significant (P 0.05). Compared with time point T1, 12, 24 and 48 hours after the operation, the visual analogue scale (VAS) scores of the two groups showed a trend of first increasing and then decreasing. Among them, at 24 and 48 hours after the operation, group B was significantly lower than group A, and the differences were statistically significant (P 0.05). Compared with 24 hours before the operation, the MMSE scores of both groups showed a trend of first decreasing and then increasing 24 and 72 hours after the operation. However, the MMSE score of group B was significantly higher than that of group A, and the differences were statistically significant (P 0.05).Conclusion Remimazolam combined with TAPB anesthesia has a relatively small impact on the hemodynamics of patients undergoing laparoscopic radical resection of colorectal cancer. It can regulate the immune and stress response indicators in the patient's body, promote postoperative recovery, reduce the patient's pain, and at the same time improve the patient's cognitive level. It is worth applying in clinical practice.