My mom lived for about 5 years in a nursing home (skilled nursing facility), only going into hospice shortly before her death (she went downhill very quickly). The social worker at the nursing home was very good about bringing up the idea of a DNR at the time of her initial admission and being pretty graphic about describing what getting CPR would be like. My mom and I both readily agreed to it. Later my mom’s dementia got worse and she became somewhat paranoid and suspicious. One time the nurse came by with her meds and my mom saw her chart or laptop or something on the nurse’s medication cart. She saw language about the DNR and got worked up that they were going to do her in. We had to periodically revisit the idea with her but fortunately she never tried to revoke it.