Glasgow Coma Scale - GCS Scale

Table of Contents

The  GCS Scale also called the Glasgow Coma Scale is a system used in conscious-level assessment for various neurological patients such as in brain injury. In 1974 Teasdale and Jennett, in Glasgow introduced this scale and described conscious level in terms of EYE openings, VERBAL response, and MOTOR response. 

The Glasgow coma scale is now widespread throughout the world. Results are reproductive irrespective of the status of the observer and can be carried out just as reliably by paramedics as by clinicians. 

How to use Glasgow Coma scale? 

The Glasgow Coma scale is divided into three scales: Eye-opening (E), Verbal response (V), and Motor response (M). The Glasgow Coma Scale is ‘scored’ from 1,  up to normal values such as the Eye-opening response scored highest to 4, the Verbal response scored highest to 5 and the Motor response scored highest to 6. 

The  Total Glasgow Coma scale (GCS) values are between three and 15, the lowest is 3, and the highest is 15. 

The Glasgow Coma scale has diffrent symbolic representations such as  9 might be expressed as GCS9  = E3V3M3.

 Eye response (4)

This is the first parameter scale of the Glasgow Coma scale where we check the movement of eyes.

 ( 1 )None – No eye opening

( 2 )To pain – Eye opening to pain

( 3 ) To Speech – Eye opening to sound such as tapping or clapping etc 

( 4 )Spontaneous  –  Eyes open spontaneously

 

Eye opening , Glasgow coma scale
(a) spontaneous and To speech (b) To pain (c) None

Verbal response (5)

This is the second parameter scale of the Glasgow Coma scale where we check the patient’s speech.

 ( 1 )None – No verbal response

( 2 )Sound  -Incomprehensible sounds such as Groans or grunts but no words.

( 3 )Words –  Inappropriate words such as asking something and replying to something else. 

( 4 )Confused  –  Talking in sentences but disoriented in time and place.

( 5) Oriented – Knows place, e.g. Southern General Hospital, and time, e.g.days, months, and years.

Motor response (6)

This is the third parameter scale of the Glasgow Coma scale where we check the motor movement of various limbs. The muscles contract which develops the motor activities.

( 1 )None -No motor response.

( 2 )Extending to pain – Abnormal extension to pain. If in response to the same stimulus elbow extension occurs, record it as’ extending to pain’. This is always accompanied by spastic flexion of wrist. 

( 3 )Flexing to pain – If the patient does not localize to supraorbital pressure, apply pressure with a pen or hard object to the nail bed. Record elbow flexion as ‘flexing to pain’. The Spastic wrist flexion may or may not accompany this response. 

( 4 )Withdrawal from pain – When the patient feels pain stimulus given by any health care professional. The patient tries to withdraw the hand of a healthcare professional. 

( 5)Localizing to pain – Apply a painful stimulus to the supraorbital area, e.g. thumbnail in supraorbital groove, increasing pressure until a response is obtained. If patient responds by bringing the hand up beyond the chin’ localizing to pain‘ ( Pressure to the nail bed or sternum at this stage may not differentiate ‘localizing’ from’ flexing’.)

( 6 )Obeys commands – The patient moves spontaneously and purposefully. 

Glasgow Coma scale
Flexing to pain : motor response

Disadvantage of the Glasgow Coma Scale

  • Language barriers: Some people do not understand certain language. Glasgow Coma Scale makes the assessment based on language. 
  • Physical: e.g., intubation, Patient who is intubated has difficulty in doing Glasgow Coma Scale assessment.  
  • Pharmacological: A patient who is paralyzed or on sedation cannot do this assessment. 
  • Spinal cord damage: A Patient with Spinal cord damage cannot perform Glasgow Coma Scale assessment
  • Orbital/cranial fracture: In fracture of cranium bones restricts the movement of the head which makes it difficult in the Glasgow Coma Scale assessment.
  • Hearing loss or speech impediment: Patient with permanent or temporary Hearing loss cannot perform Glasgow Coma Scale assessment.
  • People do not know how to use the scale sometimes even being known can perform incorrectly. 
  • For younger children and infants, we use a modified Glasglow. 
  • Teasdale and Jennett said that the Glasgow Coma Scale is incomplete, it needs modification in various other terms. 
 

The Glasgow Coma Scale assessment cannot overcome these issues which are listed above.

Glasgow Coma Scale Pupils Score

The  Glasgow Coma Scale Pupils Score was introduced in 2018 by Paul Brennan, Gordon Murray, and Graham Teasdale, It is denoted as (GCS-P). How to do you  Calculate Glasgow Coma Scale Pupils Score? 

To Calculation of the Glasgow Coma Scale Pupils Score  is the subtraction of  the Pupil Reactivity Score (PRS) from the Glasgow Coma Scale (GCS) total score:

GCS-P = GCS – PRS
  • Both pupils – 2
  • One pupil – 1
  • Neither pupil – 0

The Glasgow Coma Scale Pupils Score can range from 1 and 15 

Classification of Severity of Traumatic Brain Injury 

The Classification of Acute Traumatic Brain Injury for Glasgow Coma Scale (GCS).

  • Severe, GCS 3 to 8
  • Moderate, GCS 9 to 12
  • Mild, GCS 13 to 15

Condition in which Glasgow Coma Scale

The conditions in which the Glasgow Coma Scale is used are as follows :

  1.  Traumatic brain injury
  2. Stroke 
  3.  In infants and young children  Paediatric Glasgow Coma Scale
  4. Extracranial injuries
  5. Subarachnoid haemorrhage
  6.  brain herniation
  7. Craniocerebral trauma
  8. Diagnosis of coma or stupor. 
  9. Delirium 
  10. brain abscess
  11. seizures
  12. infection
  13. overdose

Advantages of the Glasgow Coma Scale

What are the advantages of using the Glasgow Coma Scale

  1. The most used scale for assessment of level of consciousness and recognized by every medical health care professional.
  2. Produced by well-trained staff
  3. The Glasgow Coma Scale is easy and simple to perform.
  4. It is cost-friendly as it does not need any equipment.
  5. Glasgow Coma Scale also helps to identify the prognosis of the patient.
  6. It helps in the identification of the need for EVD in patients with traumatic brain injury.
  7. APACHE-II scoring system has the Glasgow Coma Scale in it. 
  8. GCS scale helps to diagnose the depth of coma in coma patients. 

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