Effects of TAPB and flurbiprofen axetil on postoperative recovery in elderly patients undergoing colorectal surgery: a randomized, controlled trial of 2x2-factorial design

Interventions: TAPB:continue TAPB perioperaitive;The flurbiprofen group:Continuous infusion of flurbiprofen by postoperative analgesic pump;TAPB+flurbiprofen group:Continuous intraoperative and postoperative TAPB and continuous intravenous analgesic pump infusion of flurbiprofen
Primary outcome(s): The incidence of chronic pain after operation;Incidence of postoperative cognitive dysfunction
Study Design: Case-Control study