Cognitive Disorders: Dementia and Delirium · NCLEX Exam

Which statement best differentiates delirium from dementia?

  1. Delirium has a gradual onset, while dementia develops suddenly.
  2. Delirium is usually reversible, while dementia is typically irreversible.
  3. Both delirium and dementia are permanent cognitive impairments.
  4. Dementia is caused by infection, while delirium is caused by aging.
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Correct answer: Delirium is usually reversible, while dementia is typically irreversible.

Delirium is an acute, reversible disturbance in attention and cognition, often caused by medical conditions or medications, whereas dementia involves chronic, progressive cognitive decline that is irreversible.

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