Hypothermia, Accidental

With aging population, more older patients will receive major surgery for cancer. Older patients are at increased risk of postoperative neurocognitive complications including delayed neurocognitive recovery (dNCR), which is associated with prolonged hospital stay, raised complications, and impaired quality of life. Intraoperative hypothermia occurs in 57.1%-78.6% of patients undergoing major cancer surgery, especially in the elderly. Studies show that intraoperative hypothermia suppresses immune function, interferes with anesthetic metabolism, and delays anesthesia emergence. All these may be correlated with the occurrence of early postoperative dNCR. This study aims to verify whether intraoperative targeted temperature management (target core temperature: 36.8°C) compared with conventional temperature management (core temperature: 35.5°C) can reduce the incidence of dNCR in older patients undergoing major cancer surgery.