Different Intraoperative Blood Pressure Management on Postoperative Cognitive Function in Tumor Patients（PRECISION）

Intraoperative use of norepinephrine or phenylephrine (norepinephrine 0.01-0.1ug/kg/min, or phenylephrine 0.15-1.1 ug/kg/min). The actual infusion speed depends on reaching the target MAP(\>=80mmHg).