Risk Factors for Postoperative Delirium in Elderly Patients Undergoing Major Non-Cardiac Surgery in Singapore

The primary aim is to establish the risk factors, in particular the modifiable risk factors, for the development of POD in elderly patients undergoing major non-cardiac surgery in a tertiary hospital in Singapore. The secondary aims are: 1. To establish the incidence of POD in elderly patients in Singapore, including the proportions that develop hypoactive, hyperactive and mixed delirium, as well as dementia within a one-year follow-up period; 2. To understand the timeline of the development and peak incidence of POD, from the post-anaesthesia care unit till 3 days postoperatively; 3. To compare the utility and accuracy (sensitivity and specificity) of two simplified delirium detection tools, 3D CAM and NuDESC, against the gold standard DSM-5 criteria, in our population as a means for monitoring POD as standard of care in the future; 4. To collect data for holistic evaluation of neurobehavioural and daily functioning status