Perioperative Delirium and Sleep Disturbance in Aged Patients

Perioperative delirium and sleep disturbances result from environmental changes and perioperative stress in predisposed patients. Postoperative cognitive dysfunction has been defined variously in previous studies, but was clearly defined in 2018. Aged patients tend to experience postoperative delirium, but age is a fixed factor. On the other hand, low physical function as represented by frailty and preoperative cognitive decline including mild cognitive impairment are modifiable factors. Chron-ic insomnia is also a risk factor for the development of delirium. In addition, acute insomnia occurring after hospitalization was related to functional disability 3 months after surgery. We are examining the effects of Effective Medical Creation（EMC）, which involves stimulation of the five senses and thoughts/impressions on cognitive function and sleep.