My father passed away on Thanksgiving and I am still trying to make sense of his illness. He was diagnosed with dementia. My understanding is the 70% of all dementia patients have alzheimers but was not a definitive diagnosis. How do we know whether it was actually alzheimers. Also, he had falls that exacerbated his condition. I was with him a couple of times when he appeared to faint with his eyes open and non-responsive. Then he would return consciousness. Could these have been strokes? Or just simple fainting from the effort. His first most serious fall resulted in a brain injury. He was wearing 3 sweaters on a 90 degree day, which is typical of dementia... but why the subsequent falls with the blank stares and non responsiveness. I still have not received a conclusive answer to all my questions. Any insight here would be appreciated. Thanks so much.