That’s cardiovascular (heart+blood vessel) and cerebrovascular (brain+blood vessel) disease, starving cells downstream of adequate oxygen. Alzheimer’s is a condition of the nerve fibers in the brain, where they degenerate due to protein plaques (not blood-vessel plaques) and tau tangles. Sort of protein structures gone berserk. (Waving hands in the air a bit here.)
My mom has dementia due to hypertensive cerebrovascular disease, hardening of the arteries in her brain due to untreated hypertension, which has damaged and killed brain cells without ever having had strokes. (Push back and do more digging if your doc ever diagnoses “white-coat hypertension”. It might be the real thing.

) Her memory is shot, especially short-term, but her judgment is sound, and her emotions. Because of her memory deficits, she can no longer learn new things, such as self-care routines, but she’s mentally and emotionally pretty stable. She doesn’t have AD. Or if she does, it is a late-comer, with vascular dementia still dominant.
My MIL has AD. She periodically thinks my husband (her son) is her late husband. She used to have terrifying rages, until she just sort of zoned out. She once washed my cell phone when I left it on the kitchen counter while she was doing dishes, apparently thinking it was some sort of plate. We found it in the dish strainer. Lol. But no hardening of the arteries that we’re aware of.
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