The assessment of cortical function and the depth of consciousness in a critically ill or comatose child is objectively quantified using the Modified Glasgow Coma Scale (mGCS).
While impaired consciousness represents a spectrum between full arousal and complete unresponsiveness, the mGCS provides an efficient, standardized method to communicate a child’s neurological state across healthcare providers.
A thorough neurological evaluation utilizing the mGCS must be performed during the “Disability” (D) step of the primary ABCDE assessment in the emergency room.
Regular, serial monitoring of the mGCS is crucial for detecting subtle changes over time, as a deteriorating score can serve as an early warning sign for impending brain herniation or worsening intracranial pressure.
Modified Glasgow Coma Scale (mGCS) Parameters
The mGCS evaluates three distinct domains of neurological responsiveness: Eye opening (maximum score 4), Verbal response (maximum score 5), and Motor response (maximum score 6).
Because normal developmental milestones limit the verbal and motor capabilities of infants and young children, the scale is strictly categorized into two age groups: children > 5 years and children < 5 years.
Domain & Score
Child > 5 Years
Child < 5 Years
Eye Opening
4
Spontaneous
Spontaneous
3
To voice
To voice
2
To pain
To pain
1
None
None
Verbal Response
5
Orientated
Alert, babbles, coos, words or sentences - normal
4
Confused
Less than usual ability, irritable cry
3
Inappropriate words
Cries to pain
2
Incomprehensible sounds
Moans to pain
1
No response to pain
No response to pain
Motor Response
6
Obeys commands
Normal spontaneous movements
5
Localizes to supraocular pain (>9 mo)
Localizes to supraocular pain
4
Withdraws from nailbed pressure
Withdraws from nailbed pressure
3
Flexion to supraocular pain
Flexion to supraocular pain
2
Extension to supraocular pain
Extension to supraocular pain
1
No response to supraocular pain
No response to supraocular pain
Triage Acuity and Escalation of Care
During the initial triage of a sick child in the emergency department, the mGCS score strictly defines the triage acuity level and the permissible time to medical intervention.
Level 1 (Resuscitation): An mGCS score of <10 designates a life-threatening condition requiring immediate, aggressive treatment within 1 to 5 minutes.
Level 2 (Emergent): An mGCS score between 10 and 13 denotes a serious condition with the potential to rapidly become life-threatening, necessitating medical intervention within 15 minutes.
Level 3 (Urgent): An mGCS score of 14 or 15 in a sick child is considered a significant but non-immediate threat, requiring evaluation within 30 minutes.
Indications for Airway Management and Intubation
A critically low mGCS is a primary indicator of the inability to maintain airway patency or protective airway reflexes (gag and cough).
Endotracheal intubation, preferably utilizing a cerebroprotective Rapid Sequence Intubation (RSI) technique, is strictly indicated in any child with an mGCS score of ≤8.
Irrespective of the child’s initial presentation, an acute drop in the mGCS score of 3 or more points is an absolute indication for immediate endotracheal intubation, as it strongly suggests rapidly progressive intracranial hypertension or expanding intracranial pathology.
Limitations and Alternative Scoring Systems
While the mGCS is universally utilized, its verbal component cannot be accurately assessed in children who are already intubated or mechanically ventilated.
For a more detailed description of clinical findings, especially in patients with very low mGCS scores, alternative systems may offer superior utility.
The Full Outline of Unresponsiveness (FOUR) Score is an alternative objective scoring system that evaluates eye response, motor response, brainstem reflexes, and respiration; it has demonstrated better predictive value than the GCS in intubated patients, as it directly incorporates brainstem functional assessment.