Overview

This clinical study aims to investigate whether multiscale entropy analysis of electroencephalogram data can distinguish between ordinary elderly surgical patients and elderly patients with postoperative delirium.This study may help identify postoperative delirium in surgical patients at an early stage.

Eligibility

Inclusion Criteria:

1. Patients undergoing general anaesthesia with single-lumen endotracheal tube placement;
2. Age ≥65 years, gender unrestricted, body mass index (BMI) 18-28 kg/m²;
3. Normal mouth opening and head/neck mobility;
4. Pre-anaesthesia American Society of Anaesthesiologists (ASA) physical status classification of I or II and Mallampati airway classification of I or II.

Exclusion Criteria:

1. Individuals with psychiatric disorders, literacy issues, or communication difficulties who are unable to cooperate with POD screening;
2. Patients with severe lesions in vital organs, such as the heart, lungs, brain, liver or kidneys.
3. Those undergoing cardiac or neurosurgical procedures during this admission;
4. A history of alcohol abuse or recent use of sedatives or opioids;
5. haemoglobin \<100 g/L;
6. Participation in any clinical research studies within the past 3 months.