My dad has just been rushed to the emergency room unresponsive and leaning to one side. I have to pick my daughter up from school and will go to the hospital. The nurse at his facility suspects possible stroke. What has been your experience with dementia and stroke outcome?
Did he establish a living will? Did he want everything done to keep him alive? If not, get him a palliative care consult and ask about DNR.
When you know more, you might be able to gather useful information here.