Distinguishing delirium from dementia can be problematic since they may co-exist.The primary consideration in the differential is:

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Rapid change and fluctuating course of cognitive function is the primary consideration in differentiating delirium from dementia. While the Mini Mental Status Exam and the Confusion Assessment are useful tools in assessing cognitive impairment, they do not necessarily distinguish between delirium and dementia. The presence of behavioral symptoms with cognitive impairment can occur in both delirium and dementia, making it less useful in distinguishing between the two.

Distinguishing Delirium from Dementia Can Be Problematic Since They May