The prognosis for individuals with multi-infarct dementia (MID) is generally poor. The symptoms of the disorder may begin suddenly, often in a stepwise pattern after each small stroke. Some people with MID may even appear to improve for short periods of time, then decline after having more silent strokes. The disorder generally takes a downward course with intermittent periods of rapid deterioration. Death may occur from a stroke, a heart disease, pneumonia, or another infection.
This answer is based on source information from the National Institute of Neurological Disorders and Stroke.
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