Which symptom would suggest that the patient is experiencing delirium instead of dementia?

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In delirium,the patient's level of consciousness is altered;alertness may be impaired or the level of consciousness may fluctuate.Both delirium and dementia may involve disorientation and difficulty focusing and maintaining attention,so these features do not aid in distinguishing these two disorders.Autonomic nervous system functioning is altered and unstable in delirium.

Which Symptom Would Suggest That the Patient Is Experiencing Delirium