Hello thanks for asking from HCM for your health related queries
I can understand your concern. He has developed dementia. There are a lot of causes for dementia at this age. They are Age related dementia, Alzheimer's disease, Deficiency of
Vitamin B12,
Niacin deficiency,
Vascular dementia or Multi-infarct dementia, Dementia due to some infections etc. In my opinion if you don't think he has age related dementia he should be investigated accordingly to the causes I have mentioned.
His brain scan would rule out any evidence of vascular damage to brain and vascular dementia can be ruled out. He should undergo MMSE test (Mini
Mental Status Examination) to find out extent of dementia. This would help to judge improvement also. You are already giving him supplements. He should get proper benefit with drugs like
Donepezil, Memantin etc. These drugs would help to reduce the progression of dementia.
Brain stimulation games like Sudoku, Crossword, Chess etc also helps to reduce the damage.
Thanks, I hope this helps you. Take care.