A growing body of research suggests that the most common cause of dementia in older people is a mix of vascular and Alzheimer’s-related brain abnormalities, and that approximately half of people who die with Alzheimer’s also have evidence of strokes in their brains.
Furthermore, when strokes and hallmark Alzheimer’s plaques and tangles are combined, it increases a person’s likelihood of experiencing dementia. Stroke, or as it is known more generally as cerebrovascular disease, occurs with aging and is made worse by conditions like smoking, hypertension or diabetes.
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From Medical Express