Can anesthesia cause dementia? Can it make dementia worse? Are some types of anesthesia safer than others?

Alzheimer's and Anesthesia
I've seen many caregivers worried about the potential effects of anesthesia if their loved ones who have dementia must undergo surgery. I looked into this issue in great detail when a friend who has
Anesthesia and Incident Dementia: A Population-Based, Nested, Case-Control Study
Objective: To test the hypothesis that exposure to procedures requiring general anesthesia during adulthood is not significantly associated with incident dementia using a retrospective, population-ba