I am not a doctor but multi-infarct dementia would be when multiple spots of the brian have died causing the patient to fall into a series of dementia and other illnesses.

Multi-infarct dementia is one form of dementia that occurs when small blood vessels in the brain are blocked by blood clots or fatty deposits.

The root cause of multi-infarct dementia is usually small blood clots that lodge in blood vessels in the brain, which results in the death of brain cells.

Multi-infarct dementia is the second most common cause of dementia in older people after Alzheimer's disease, accounting for up to 20% of all progressively worsening dementias.

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