Dementia Therapy Can Anyone Tell Me How Beneficial Oxygen Is For Vascular Dementia? And How Can One Get Hold Of It?

Can anyone tell me how beneficial oxygen is for vascular dementia? and how can one get hold of it? - dementia therapy

After hearing from a friend, whose father, dementia, and if put into a hospital for something else to oxygen are admitted, and was very clear and his memory has been largely after 7 years later a home for people with dementia. Unfortunately, he died of a different problem that we have no idea where the oxygen could contribute in the long run it. Ideas?