1. The patient meets basic diagnostic criteria for dementia but also has:
a. Focal neurological signs and symptoms or laboratory evidence of cerebrovascular disease (eg, multiple infarctions).
b. Vascular dementia is further classified as with delirium, delusions, depressed mood, or uncomplicated.
c. Unlike Alzheimer's disease, changes in functioning may be abrupt, and the long-term course tends to have a stepwise and fluctuating pattern. Deficits are highly variable depending on the location of the vascular lesions, leaving some cognitive functions intact.
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