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When a person is diagnosed with dementia, she has a significant impairment of two or more neurological functions without having lost consciousness. For example, a patient may have impairment in memory and judgment. Several types of dementia exist, which are classified by what areas of the brain they affect, if they result from another condition, and if they become progressively worse.

The second most common type of dementia is vascular dementia — about 20 percent of all dementia cases are vascular dementia, according to the National Institute of Neurological Disorders and Stroke.
This type of dementia results when damage occurs to the patient’s blood vessels in her brain. As a result, the brain does not get as much blood, which carries oxygen and nutrients, leading to functional problems.

Several conditions can cause vascular dementia: the noted that common causes include a stroke that results in a blocked artery in the brain and chronically damaged or narrowed blood vessels in the brain. Damage to the arteries may result from conditions such as diabetes, high blood pressure and lupus erthematosus.

One type of vascular dementia, multi-infarct dementia, results from multiple small strokes. If one stroke causes the dementia, it is called single-infarct dementia. However, the National Institute of Neurological Disorders and Stroke pointed out that not all strokes cause vascular dementia

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