Department of Anesthesiology and Perioperative Medicine Shanghai Fourth People''s Hospital Tongji University Shanghai 200081 China;
First Department of Surgery Shanghai Fourth People''s Hospital Tongji University Shanghai 200081 China;
Department of Anesthesiology and Perioperative Medicine Shanghai Fourth People''s Hospital Tongji University Shanghai 200081 China;
Department of Anesthesiology and Perioperative Medicine Shanghai Fourth People''s Hospital Tongji University Shanghai 200081 China;
Department of Anesthesiology and Perioperative Medicine Shanghai Fourth People''s Hospital Tongji University Shanghai 200081 China;
Surgical anesthesia; Elderly patients; Postoperative cognition;