Normal Pressure Hydrocephalus
is one of the few treatable causes of Dementia
and will respons well to CSF diversion. If the diagnosis of NPH is confirmed, then CSF diversion using either a VP shunt (tube from the brain fluid to the abdomen) or TP shunt (from the spinal fluid to the abdomen) will be the choice. I would encourage you to consider the surgical option since it can produce good results in patient's with NPH. Age of 71, well controlled diabetes
is not a contraindication for the operation. If not operated, the dementia is likely to progressively get worse. A lumbar puncture
and draining out fluid will help to predict the response of an operation. Maybe you can consider this before deciding one way or another because it can help you and your father get an idea what the improvement after shunting is likely to be.