The Second Affiliated Hospital of Nanchang University
The goal of this observational study is to compare the perioperative EEG characteristics and the incidence of short-term cognitive dysfunction in patients with postoperative delirium and non-postoperative delirium after elderly (\> 65 years old) patients undergoing major gastrointestinal surgery under general anesthesia. The main question it aims to answer are: • The correlation between postoperative cognitive dysfunction and postoperative EEG features was evaluated.• To analyze the correlation between EEG characteristics and clinical risk factors of delirium after major abdominal gastrointestinal surgery under general anesthesia in elderly patients.Participants will collect EEG before and after operation and collect the incidence of postoperative cognitive function to explore the mechanism of postoperative delirium and predict postoperative cognitive dysfunction.
⁃ Education level in primary school or above;
⁃ Age ≥65 years old, gender is not limited;
⁃ Good communication ability, language expression ability, mental state and consciousness state;
⁃ Preoperative simple mental state scale score ≥27 points;
⁃ no history of craniocerebral diseases;
⁃ For patients who plan to choose abdominal surgery under general anesthesia, the operation time is expected to be about 2h-4h;
⁃ ASA anesthesia grade I \
• III;
⁃ No general anesthesia contraindications;
⁃ Sign informed consent voluntarily;