The disorder usually affects older people, over 55 years, with the onset averaging around age 65. The disorder is associated with atherosclerosis, a condition where fatty deposits occur in the inner lining of the arteries. Atherosclerotic plaque damages the lining of an artery. Cholesterol and other fats also collect at this site, forming a mass within the lining of the artery. The consequences vary depending on the location and severity of the infarctions.
Memory impairment is often an early symptom of the disorder, followed by judgment impairment.
Personality and mood changes accompany the deteriorating mental condition. Apathy and lack of motivation are common. Catastrophic reaction, where a person reacts to tasks by withdrawal or extreme agitation, is common. Confusion that occurs or is worsened at night is also common. Risks include a history of MID, stroke, hypertension, smoking, and atherosclerosis.