Harvard Health Letters: Heart disease and dementia: The second most common type of dementia, vascular dementia, develops when blood vessels do not supply adequate oxygen to the brain. Typically, small blockages deprive some brain cells of oxygen, causing them to die. Most of the time, the brain damage occurs in small enough amounts that it goes unobserved by the patient, family members, or friends. In effect, the patient is experiencing a series of small strokes.
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