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Consciousness - decreased

Definition

Decreased consciousness is reduced alertness or awareness.

Alternative Names

Stuporous; Mental status - decreased; Loss of alertness; Decreased consciousness; Alertness - decreased; Changes in consciousness; Obtundation; Coma; Unresponsiveness

Considerations

A persistent coma is called vegetative state.

Common Causes

Many conditions can cause decreased consciousness, including:

Home Care

A decrease in consciousness almost always require a doctor's attention, except perhaps when due to alcohol intoxication, simple fainting, or a previously recognized seizure disorder.

See the article on seizures for tips on how to care for a person who is having a seizure.

Persons with epilepsy or other seizure disorder should carry a Medic-Alert bracelet or pendant describing their condition. Such individuals should avoid situations that have previously triggered a seizure.

Call your health care provider if

See medical help if someone has unexplained, decreased consciousness. Call your local emergency number (such as 911) if normal consciousness does not return quickly.

What to expect at your health care provider's office

Most often, a person with decreased consciousness will be evaluated in an emergency room setting.

The doctor will perform a physical examination. The exam will include a detailed look at the cardiovascular, respiratory, and nervous systems.

The health care team will ask questions about the person's medical history and symptoms, including

  • Time pattern
    • When did the decreased consciousness occur?
    • How long did it last?
    • Has it ever happened before? If so, how many times?
    • Did the person behave the same way on previous episodes?
  • Medical history
    • Does the person have known epilepsy or seizure disorder?
    • Does the person have diabetes?
    • Has the person been sleeping well?
    • Has there been a recent head injury?
  • Other
    • What medications does the person take?
    • Does the person habitually use alcohol or drugs?
    • What other symptoms are present?

Tests that may be done include:

Treatment depends on the underlying cause of the decreased consciousness. How well a person does depends on the cause of the condition. The longer the person has a decreased or altered level of consciousness, the worse the outcome.

References

Blok BK, Newman TM. Syncope. In: Tintinalli JE, Kelen GD, Stapczynski JS, Ma OJ, Cline DM, eds. Emergency Medicine: A Comprehensive Study Guide. 6th ed. New York, NY: McGraw-Hill; 2004:chap 52.

Huff JS. Altered mental status and coma. In: Tintinalli JE, Kelen GD, Stapczynski JS, Ma OJ, Cline DM, eds. Emergency Medicine: A Comprehensive Study Guide. 6th ed. New York, NY: McGraw-Hill; 2004:chap 259.

Kirsch TD. Head injury. In: Tintinalli JE, Kelen GD, Stapczynski JS, Ma OJ, Cline DM, eds. Emergency Medicine: A Comprehensive Study Guide. 6th ed. New York, NY: McGraw-Hill; 2004:chap 255.


Review Date: 4/21/2009
Reviewed By: Jacob L. Heller, MD, Emergency Medicine, Virginia Mason Medical Center, Seattle, Washington, Clinic. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
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.
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