Final answer:
Postoperative cognitive dysfunction can be caused by factors such as postoperative delirium and certain risk factors, but the exact cause may not always be determined.
Step-by-step explanation:
Postoperative cognitive dysfunction refers to a decline in cognitive function following surgery. There are several possible causes of postoperative cognitive dysfunction. One cause is postoperative delirium, which is a state of confusion and disorientation that can occur after surgery. Risk factors, such as advanced age, pre-existing cognitive impairment, and certain medical conditions, can also contribute to postoperative cognitive dysfunction. However, the exact cause of postoperative cognitive dysfunction cannot always be determined.