Effect of Transversus Abdominis Plane Block Combined With Dexmedetomidine Infusion on the Prognosis in Elderly Patients Undergoing Abdominal Surgery

To compare the prognosis of elderly patients undergoing radical resection of colorectal cancer treated with general anesthesia and general anesthesia combined with transversus abdominis plane block and continuous infusion of dexmedetomidine. The incidence of postoperative delirium, postoperative acute pain moderately to severely and poor postoperative recovery were composite endpoints to determine the prognosis of patients.