Glasgow Coma Score

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The Glasgow Coma Scale is a neurology Scale (ratio) which aims to give a reliable, objective way of recording the conscious state of a person, for initial as well as continuing assessment. A patient is assessed against the criteria of the scale, and the resulting points give the Glasgow Coma Score (or GCS).

Initially used to assess level of consciousness after head injury, the scale is actually applied to different situations. The scale was published in 1974 by Graham Teasdale and Bryan J. Jennett, professors of neurosurgery at the University of Glasgow. The pair went on to author the textbook Management of Head Injuries (FA Davis 1981, ISBN 0-8036-5019-1), a celebrated work in the field.

GCS is used as part of several ICU scoring systems, including APACHE II, SAPS II, and SOFA Score, to assess the status of the central nervous system. A similar scale, the Rancho Los Amigos Scale is used to assess the recovery of traumatic brain injury patients.

Elements of the scale {| class="wikitable" style="text-align: center"|+ Glasgow Coma Scale|-|! 6 !! 5 !! 4 !! 3 !! 2 !! 1|-! Eyes| N/A| N/A| Opens eyes spontaneously| Opens eyes in response to voice| Opens eyes in response to painful stimuli| Does not open eyes|-! Verbal| N/A| Oriented, converses normally| Confused, disoriented| Utters inappropriate words| Incomprehensible sounds| Makes no sounds|-! Motor| Obeys Commands| Localizes painful stimuli| Withdraws from painful stimuli| Decorticate posturing upon painful stimuli] upon painful stimuli| Makes no movements|}

The scale comprises three tests: visual perception, Speech communication and motor skill responses. The three values separately as well as their sum are considered. The lowest possible GCS (the sum) is 3 (deep coma or death), whilst the highest is 15 (fully awake person).

Best eye response (E) There are 4 grades starting with the most severe:

No eye opening

Eye opening in response to pain and nociception. (Patient responds to pressure on the patient’s fingernail bed; if this does not elicit a response, Supraorbital ridge and sternum pressure or rub may be used.)

Eye opening to speech. (Not to be confused with an awaking of a sleeping person; such patients receive a score of 4, not 3.)

Eyes opening spontaneously

Best verbal response (V) There are 5 grades starting with the most severe:

No verbal response

Incomprehensible sounds. (Moaning but no words.)

Inappropriate words. (Random or exclamatory articulated speech, but no conversational exchange)

Confused. (The patient responds to questions coherently but there is some disorientation and confusion.)

Oriented. (Patient responds coherently and appropriately to questions such as the patient’s name and age, where they are and why, the year, month, etc.)

Best motor response (M) There are 6 grades starting with the most severe:

No motor response

Extension to pain (decerebrate response: adduction, internal rotation of shoulder, pronation of forearm)

Flexion in response to pain (abnormal posturing)

Withdraws from pain (pulls part of body away when pinched; normal flexion)

Localizes to pain. (Purposeful movements towards changing painful stimuli; e.g. hand crosses mid-line and gets above clavicle when supra-orbital pressure applied.)

Obeys commands. (The patient does simple things as asked.)

Interpretation Individual elements as well as the sum of the score are important. Hence, the score is expressed in the form "GCS 9 = E2 V4 M3 at 07:35".

Generally, comas are classified as:

Severe, with GCS ≤ 8
Moderate, GCS 9 - 12
Minor, GCS ≥ 13.

The GCS has limited applicability to children, especially below the age of 36 months (where the verbal performance of even a healthy child would be expected to be poor). Consequently the Pediatric Glasgow Coma Scale, a separate yet closely related scale, was developed for assessing younger children.

Revisions

Revised Glasgow Coma Scale: Some centers score GCS out of 14, not 15, omitting "withdraws from pain".
The Rappaport Coma/Near Coma Scale made other changes.