Health Guide

	Health Encyclopedia
	Lab Tests

Drug Guide

	DrugNotes
	Spanish DrugNotes
	Detailed Drug Information
	Alternative Medicine

Images

Central nervous...

 

Delirium

Definition

Delirium is sudden severe confusion and rapid changes in brain function that occur with physical or mental illness.

Alternative Names

Acute confusional state; Acute brain syndrome

Causes

Delirium is most often caused by physical or mental illness and is usually temporary and reversible. Many disorders cause delirium, including conditions that deprive the brain of oxygen or other substances.

Causes include:

• Drug abuse
• Infections such as urinary tract infections or pneumonia (in people who already have brain damage from stroke or dementia)
• Poisons
• Fluid/electrolyte or acid/base disturbances

Patients with more severe brain injuries are more likely to get delirium from another illness.

Symptoms

Delirium involves a quick change between mental states (for example, from lethargy to agitation and back to lethargy).

Symptoms include:

• 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 inactive or slow moving)
• Changes in sleep patterns, drowsiness
• Confusion (disorientation) about time or place
• Decrease in short-term memory and recall
  • Unable to remember events since delirium began (anterograde amnesia)
  • Unable to remember past events (retrograde amnesia)
• Disrupted or wandering attention
  • Inability to think or behave with purpose
  • Problems concentrating
• Disorganized thinking
  • Speech that doesn't make sense (incoherent)
  • Inability to stop speech patterns or behaviors
• Emotional or personality changes
  • Anger
  • Anxiety
  • Apathy
  • Depression
  • Euphoria
  • Irritability
• Movements triggered by changes in the nervous system (psychomotor restlessness)

Exams and Tests

The following tests may have abnormal results:

• An exam of the nervous system (neurologic examination)
• Psychologic studies
• Tests of feeling (sensation), thinking (cognitive function), and motor function

The following tests may also be done:

• Ammonia levels
• B12 level
• Blood chemistry (chem-20)
• Blood gas analysis
• Chest x-ray
• Cerebrospinal fluid (CSF) analysis
• CPK
• Drug, alcohol levels (toxicology screen)
• Electroencephalogram (EEG)
• Glucose test
• Head CT scan
• Head MRI scan
• Liver function tests
• Mental status test
• Serum calcium
• Serum electrolytes
• Serum magnesium
• Thyroid function tests
• Thyroid stimulating hormone level
• Urinalysis

Treatment

The goal of treatment is to control or reverse the cause of the symptoms. Treatment depends on the condition causing delirium. Diagnosis and care should take place in a pleasant, comfortable, nonthreatening, physically safe environment. The person may need to stay in the hospital for a short time.

Stopping or changing medications that worsen confusion, or that are not necessary, may improve mental function. Medications that may worsen confusion include:

• Alcohol and illegal drugs
• Analgesics
• Anticholinergics
• Central nervous system depressants
• Cimetidine
• Lidocaine

Disorders that contribute to confusion should be treated. These may include:

• Heart failure
• Decreased oxygen (hypoxia)
• High carbon dioxide levels (hypercapnia)
• Thyroid disorders
• Anemia
• Nutritional disorders
• Infections
• Kidney failure
• Liver failure
• Psychiatric conditions (such as depression)

Treating medical and mental disorders often greatly improves mental function.

Medications may be needed to control aggressive or agitated behaviors. These are usually started at very low doses and adjusted as needed.

Medications include:

• Dopamine blockers (haloperidol, olanzapine, risperidone, clozapine)
• Mood stabilizers (fluoxetine, imipramine, citalopram)
• Sedating medications (clonazepam or diazepam)
• Serotonin-affecting drugs (trazodone, buspirone)
• Thiamine

Some people with delirium may benefit from hearing aids, glasses, or cataract surgery.

Other treatments that may be helpful:

• Behavior modification to control unacceptable or dangerous behaviors
• Reality orientation to reduce disorientation

Outlook (Prognosis)

Acute conditions that cause delirium may occur with chronic disorders that cause dementia. Acute brain syndromes may be reversible by treating the cause.

Delirium often lasts only about 1 week, although it may take several weeks for mental function to return to normal levels. Full recovery is common.

Possible Complications

• Loss of ability to function or care for self
• Loss of ability to interact
• Progression to stupor or coma
• Side effects of medications used to treat the disorder

When to Contact a Medical Professional

Call your health care provider if there is a rapid change in mental status.

Prevention

Treating the conditions that cause delirium can reduce its risk.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.

---