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National Institute of Neurological Disorders and Stroke
What is Coma and Persistent Vegetative State?
A coma is a profound or deep state of unconsciousness. An individual in a state of coma is alive but unable to move or respond to his or her environment. Coma may occur as a complication of an underlying illness, or as a result of injuries, such as head trauma. A persistent vegetative state (commonly, but incorrectly, referred to as "brain death") sometimes follows a coma. Individuals in such a state have lost their thinking abilities and awareness of their surroundings, but retain non-cognitive function and normal sleep patterns. Even though those in a persistent vegetative state lose their higher brain functions, other key functions such as breathing and circulation remain relatively intact. Spontaneous movements may occur, and the eyes may open in response to external stimuli. They may even occasionally grimace, cry, or laugh. Although individuals in a persistent vegetative state may appear somewhat normal, they do not speak and they are unable to respond to commands.
Is there any treatment?
Once an individual is out of immediate danger, the medical care team focuses on preventing infections and maintaining a healthy physical state. This will often include preventing pneumonia and bedsores and providing balanced nutrition. Physical therapy may also be used to prevent contractures (permanent muscular contractions) and deformities of the bones, joints, and muscles that would limit recovery for those who emerge from coma.
What is the prognosis?
The outcome for coma and persistent vegetative state depends on the cause, severity, and site of neurological damage. Individuals may emerge from coma with a combination of physical, intellectual, and psychological difficulties that need special attention. Recovery usually occurs gradually, with some acquiring more and more ability to respond. Some individuals never progress beyond very basic responses, but many recover full awareness. Individuals recovering from coma require close medical supervision. A coma rarely lasts more than 2 to 4 weeks. Some patients may regain a degree of awareness after persistent vegetative state. Others may remain in that state for years or even decades. The most common cause of death for someone in a persistent vegetative state is infection, such as pneumonia.
What research is being done?
The NINDS supports and conducts research on neurological conditions such as coma and persistent vegetative state. This research is aimed at finding ways to prevent, treat, and cure these conditions.
Select this link to view a list of studies currently seeking patients.
Organizations
Brain Injury Association of America, Inc.
1608 Spring Hill Rd
Suite 110
Vienna, VA 22182
braininjuryinfo@biausa.org
http://www.biausa.org
Tel: 703-761-0750 800-444-6443
Fax: 703-761-0755
Brain Trauma Foundation
523 East 72nd Street
8th Floor
New York, NY 10021
http://www.braintrauma.org
Tel: 212-772-0608
Fax: 212-772-0357
Coma Recovery Association
8300 Republic Airport
Suite 106
Farmingdale, NY 11735
inquiry@comarecovery.org
http://comarecovery.org
Tel: 631-756-1826
Fax: 631-756-1827
Family Caregiver Alliance/ National Center on Caregiving
180 Montgomery Street
Suite 1100
San Francisco, CA 94104
info@caregiver.org
http://www.caregiver.org
Tel: 415-434-3388 800-445-8106
Fax: 415-434-3508
National Rehabilitation Information Center (NARIC)
4200 Forbes Boulevard
Suite 202
Lanham, MD 20706-4829
naricinfo@heitechservices.com
http://www.naric.com
Tel: 301-459-5900/301-459-5984 (TTY) 800-346-2742
Fax: 301-562-2401
National Stroke Association
9707 East Easter Lane
Suite B
Centennial, CO 80112-3747
info@stroke.org
http://www.stroke.org
Tel: 303-649-9299 800-STROKES (787-6537)
Fax: 303-649-1328
From the National Institute of Neurological Disorders and Stroke. National Institutes of Health. www.ninds.nih.gov.