Acute confusional state; Acute brain syndrome
Delirium is sudden severe confusion due to rapid changes in brain function that occur with physical or mental illness.
Delirium is most often caused by physical or mental illness and is usually temporary and reversible. Many disorders cause delirium. Often, these do not allow the brain to get oxygen or other substances. They may also cause dangerous chemicals (toxins) to build up in the brain. Delirium is common in the intensive care unit (ICU), especially in older adults.
- Changes in alertness (usually more alert in the morning, less alert at night)
- Changes in feeling (sensation) and perception
- Changes in level of consciousness or awareness
- Changes in movement (for example, may be slow moving or hyperactive)
- Changes in sleep patterns, drowsiness
- Confusion (disorientation) about time or place
- Decrease in short-term memory and recall
- Disorganized thinking, such as talking in a way that doesn't make sense
- Emotional or personality changes, such as anger, agitation, depression, irritability, and overly happy
- Movements triggered by changes in the nervous system
- Problem concentrating
Exams and Tests
The following tests may have abnormal results:
- An examination of the nervous system (neurologic examination), including tests of feeling (sensation), mental status, thinking (cognitive function), and motor function
- Neuropsychological studies
The following tests may also be done:
The goal of treatment is to control or reverse the cause of the symptoms. Treatment depends on the condition causing delirium. The person may need to stay in the hospital for a short time.
Stopping or changing medicines that worsen confusion, or that are not necessary, may improve mental function.
Disorders that contribute to confusion should be treated. These may include:
- Decreased oxygen (hypoxia)
- Heart failure
- High carbon dioxide levels (hypercapnia)
- Kidney failure
- Liver failure
- Nutritional disorders
- Psychiatric conditions (such as depression or psychosis)
- Thyroid disorders
Treating medical and mental disorders often greatly improves mental function.
Medicines may be needed to control aggressive or agitated behaviors. These are usually started at very low dosages and adjusted as needed.
Some people with delirium may benefit from hearing aids, glasses, or cataract surgery.
Other treatments that may be helpful:
Delirium often lasts about 1 week. It may take several weeks for mental function to return to normal. Full recovery is common, but depends on the underlying cause of the delirium.
When to Contact a Medical Professional
Call your health care provider if there is a rapid
Treating the conditions that cause delirium can reduce its risk. In hospitalized people, avoiding or using a low dosage of sedatives, prompt treatment of metabolic disorders and infections, and using reality orientation programs will reduce the risk of delirium in those at high risk.
Guthrie PF, Rayborn S, Butcher HK. Evidence-based practice guideline: delirium. J Gerontol Nurs. 2018;44(2):14-24. PMID: 29378075
Inouye SK. Delirium in the older patient. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 26th ed. Philadelphia, PA: Elsevier; 2020:chap 25.
Mendez MF, Padilla CR. Delirium. In: Daroff RB, Jankovic J, Mazziotta JC, Pomeroy SL, eds. Bradley's Neurology in Clinical Practice. 7th ed. Philadelphia, PA: Elsevier; 2016:chap 4.
Last reviewed on: 9/17/2019
Reviewed by: Alireza Minagar, MD, MBA, Professor, Department of Neurology, LSU Health Sciences Center, Shreveport, LA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.