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- Concurrent disturbances of both consciousness and cognition (including attention, memory, visuospatial function, executive function) often accompanied by changes in psychomotor behavior, perception, emotion, and sleep-wake cycle
- Duration is variable, but onset is often abrupt, usually over the course of hours to days, and ranging in severity.
- Can persist for weeks to months
- Delirium is a clinical syndrome indicating underlying pathology.
- It is not a disease unto itself.
- Delirium is classified under the neurocognitive disorders (NCDs) section of the Diagnostic and Statistical Manual of Mental Disorders, 5th Edition (DSM-5) .