Coma

Medical Author:
Medical Editor:

What is a "coma"?

Coma is a state of unconsciousness whereby a patient cannot react with the surrounding environment. The patient cannot be wakened with outside physical or auditory stimulation. The inability to waken differentiates coma from sleep. Patients can have different levels of unconsciousness and unresponsiveness depending upon how much or how little of the brain is functioning.

What is the Glasgow Coma Scale?

The Glasgow Coma Scale was developed to provide health-caregivers a simple way of measuring the depth of coma based upon observations of eye opening, speech, and movement. Patients in the deepest level of coma:

  • do not respond with any body movement to pain,
  • do not have any speech, and
  • do not open their eyes.

Those in lighter comas may offer some response, to the point they may even seem wake, yet meet the criteria of coma because they do not respond to their environment.

The scale is used as part of the initial evaluation of a patient, but does not assist in making the diagnosis as to the cause of coma. Since it "scores" the level of coma, the Glasgow Coma Scale can be used as a standard method for any health-caregiver to assess change in patient status.

The best use of the Glasgow Coma Scale is to allow caregivers of different clinical skills and training to consistently assess a patient over longer periods of time in order to determine whether the patient is improving, deteriorating, or remaining the same. In the initial care of a comatose patient, there may be first responders, EMTs, paramedics, emergency physicians, neurologists, neurosurgeons, and nurses evaluating the patient. The Glasgow Coma Scale allows a standard assessment that can be shared.

Glasgow Coma Scale
Eye Opening  
Spontaneous 4
To loud voice 3
To pain 2
None 1
 
Verbal Response  
Oriented 5
Confused, Disoriented 4
Inappropriate words 3
Incomprehensible words 2
None 1
 
Motor Response  
Obeys commands 6
Localizes pain 5
Withdraws from pain 4
Abnormal flexion posturing 3
Extensor posturing 2
None 1

A fully awake patient has a Glasgow  Coma Score of 15. A person who has deceased has a Glasgow  Coma Scale of 3 (there is no lower score).

Reviewed by William C. Shiel Jr., MD, FACP, FACR on 10/5/2011


Patient Comments

Viewers share their comments

Coma - Causes Question: What was the cause of a coma in a friend or relative? Please share your experience.
Coma - Tests Question: What tests or procedures did your friend or relative receive while in a coma?
Coma - Cause Question: What was the cause of your coma?
Coma - Induced Question: Please describe your experience with an induced coma.

Sports and Concussions

Sports and Concussions: What Are the Recommendations?

When it comes to making recommendations, doctors' organizations tend to come late to the game, calling press conferences to state the obvious. A recent came from the American Academy of Neurology with their pronouncement that "any athlete who is suspected to have suffered a concussion should be removed from participation until he or she is evaluated by a physician with training in the evaluation and management of sports concussions." The Academy's position also included an educational component to increase concussion education for parents, athletes, and coaches; and reminded us that players should not return to competition until they had recovered from their injury.

It took a little while for common sense to return to the halls of neurology academia; their last position paper from 1997 allowed players with concussions to return to play immediately if they were deemed to be asymptomatic with normal neurologic assessment at rest and with exercise. It was routine to see players running on the sideline after a head injury, as part of their evaluation to determine if concussion symptoms could be provoked.

Get the latest health and medical information delivered direct to your inbox FREE!