Glasgow Coma Scale (GCS): Jrship viva guide

• E: Eye opening, maximum 4
• V: Verbal response, maximum 5
• M: Motor response, maximum 6

1. How to introduce it in a viva

“GCS is a clinical scale used to assess consciousness by evaluating eye opening, verbal response, and best motor response. The total score ranges from 3 to 15. I assess the patient after ensuring ABC stabilization, record the best response in each component, and document both the component scores and total, with time of assessment and any confounding factors such as sedation or intubation.”

2. Before assessing GCS

First do ABCDE

• A: Ensure airway is patent and protect cervical spine if trauma is suspected.
• B: Check oxygenation, ventilation, respiratory effort.
• C: Check pulse, BP, shock, bleeding.
• D: Assess pupils, glucose, focal deficits, and GCS.
• E: Look for trauma, seizures, rash, needle marks, etc.

Important bedside rules

1. Introduce yourself and observe the patient before touching them.
2. Check whether the patient opens eyes spontaneously and speaks normally.
3. Give a clear command first, for example:

   “Open your eyes.”
   “Show me two fingers.”
   “Squeeze my hand and let go.”

4. If there is no response, apply an appropriate central painful stimulus.
5. Record the best response, not the worst response.
6. Repeat serially. A falling GCS is often more important than a single score.

3. Eye opening response: E4

Viva points

• “To speech” means eyes open when spoken to, not after painful stimulus.
• If the patient is asleep but opens eyes to normal voice, it is E3, not E4.
• If eyelids cannot be opened due to swelling, write E-NT, not E1.

4. Verbal response: V5

How to test orientation

• “What is your name?”
• “Where are you?”
• “What day/month/year is it?”
• “Why are you here?”

Common confusion in viva

• V4 confused: Patient speaks in meaningful sentences but is disoriented.
  Example: “I am at home, it is 2019,” while actually in hospital in 2026.
• V3 inappropriate words: Individual words are understandable but do not form a meaningful conversation.
  Example: “Car... mother... blue.”
• V2 incomprehensible sounds: Only moaning/groaning, no recognizable words.

Intubated patient

E3 V-NT M6, intubated

5. Motor response: M6

The key distinction: localizing versus withdrawal

M5: Localizes pain

• The patient makes a purposeful movement toward the stimulus.
• For example, after trapezius squeeze, the patient reaches across the body to push your hand away.
• It shows higher cortical function.

M4: Withdrawal from pain

• The patient flexes or pulls the limb away from pain.
• The limb does not reach toward or attempt to remove the stimulus.
• It is less purposeful than localization.

Abnormal posturing

• Arms flexed and adducted toward chest
• Wrists and fingers flexed
• Legs often extended

• Arms extended and pronated
• Wrists may be flexed
• Legs extended
• Indicates severe brain dysfunction and is generally more concerning than abnormal flexion.

6. How to apply pain correctly

Preferred central painful stimuli

• Trapezius squeeze
• Supraorbital pressure
  Avoid if there is suspected facial/orbital fracture.
• Mandibular pressure
• Sternal rub is commonly used but is less preferred because it can cause bruising and gives a less precise motor assessment.

Peripheral painful stimulus

• Nail-bed pressure may be used to assess each limb separately, especially when focal weakness is suspected.
• It should not be the only method used to determine the overall GCS motor response.

Do not do

• Do not cause injury.
• Do not repeatedly stimulate the patient unnecessarily.
• Do not use painful stimulus before trying voice and simple commands.
• Do not confuse a spinal reflex with purposeful motor response.

7. Interpretation of the total score

“GCS 8, intubate?”

“A GCS of 8 or less is a warning threshold for urgent airway assessment and likely airway protection, but intubation is a clinical decision based on airway reflexes, oxygenation, ventilation, trajectory, facial injury, seizures, and anticipated deterioration, not on the number alone.”

“GCS 8, intubate.”

8. Examples for viva practice

Example 1

• E3
• V4
• M6

GCS = 13/15, E3 V4 M6

Example 2

• E2
• V2
• M4

GCS = 8/15, E2 V2 M4

Example 3

• E4
• V4
• M5

GCS = 13/15, E4 V4 M5

Example 4: Intubated patient

• E2
• V-NT
• M5

Document: E2 V-NT M5, intubated
Avoid recording the verbal component as V1 and avoid a falsely low total.

9. GCS documentation

15:00: GCS E3 V4 M6 = 13/15. Patient opens eyes to voice, confused but conversing, obeys commands. Pupils 3 mm bilaterally equal and reactive. Capillary glucose 112 mg/dL.

15:00: GCS E2 V-NT M5, intubated and sedated. Pupils 3 mm equal/reactive.

• Time
• Components and total when valid
• Sedation/paralysis/intubation status
• Pupillary findings
• Any focal deficit
• Trend compared with prior assessment

10. Limitations and confounders

• Alcohol or drug intoxication
• Sedation, anesthesia, or neuromuscular paralysis
• Hypoxia, hypercapnia, shock, hypoglycemia
• Intubation/tracheostomy
• Aphasia or hearing impairment
• Language barrier
• Dementia or intellectual disability
• Facial trauma, eyelid swelling, orbital injury
• Spinal cord injury or limb fractures
• Seizure/postictal state
• Pre-existing motor deficits

11. Paediatric GCS

12. Common viva questions with model answers

What does GCS assess?

“It assesses level of consciousness using eye opening, verbal response, and best motor response.”

What is the minimum and maximum score?

“Minimum is 3 and maximum is 15.”

What is the most important motor response?

“The best motor response. It is often the most useful component when verbal assessment is limited, such as in intubated patients.”

Differentiate M5 from M4.

“M5 localizes pain with a purposeful attempt to remove the stimulus. M4 withdraws a limb away from pain without reaching toward the stimulus.”

How do you record GCS in an intubated patient?

“I record eye and motor components and document verbal response as NT due to intubation, for example E3 V-NT M6. I do not assign V1 simply because the patient is intubated.”

Is GCS 15 always normal?

“No. A patient can have GCS 15 with concussion, confusion not elicited by brief questioning, focal neurological deficits, intoxication, or intracranial pathology. GCS does not replace a full neurological examination.”

What is the significance of a drop in GCS?

“A fall in GCS, particularly a fall in motor score, may indicate neurological deterioration such as expanding intracranial hemorrhage, rising intracranial pressure, seizure, hypoxia, hypoglycemia, or worsening metabolic illness. It requires immediate reassessment.”

One-minute viva answer to memorize

“Glasgow Coma Scale is used to describe and monitor consciousness. It has three components: eye opening out of 4, verbal response out of 5, and best motor response out of 6, giving a total from 3 to 15. I first stabilize ABC and exclude reversible causes such as hypoxia and hypoglycemia. I assess spontaneous response, then response to voice and commands, and if required use a central painful stimulus. I record the best component scores, for example E3 V4 M6 equals 13/15, along with time and confounding factors. In intubated patients, verbal response should be recorded as not testable, not as V1. A falling GCS, especially motor response, requires urgent reassessment. GCS 13-15 is mild, 9-12 moderate, and 8 or below severe head injury, but airway management should be based on the whole clinical picture.”

1. Eyes
2. Talking
3. Moving

Easy memory trick

E V M = 4, 5, 6
Eyes = 4 points
Voice = 5 points
Movement = 6 points

GCS = Eyes + Voice + Movement

1. Eyes: E

Example

• They open eyes: E3
• Their eyes were already open: E4

2. Voice: V

Example

• “My name is Ravi. I am in the hospital.” = V5
• “I am in my bedroom,” when actually in hospital = V4
• “Car... blue... mother...” = V3
• “Uhhh... ahhh...” = V2

3. Movement: M

The important confusing part

• If the patient tries to remove that hand, that is M5: localizes.
• If the patient only pulls their arm away, that is M4: withdraws.

M5 = “Get your hand away from me!”
M4 = “I move away, but do not find your hand.”

Putting it together

• Opens eyes when called: E3
• Talks but is confused: V4
• Follows a command: M6

E3 + V4 + M6 = 13

GCS 13/15, E3 V4 M6

What do the scores mean?

One tiny story to remember it

“Open your eyes!”

“What is your name? Where are you?”

“Show me two fingers.”

3 + 4 + 6 = 13/15

Important special case: breathing tube

V-NT

E3 V-NT M6, intubated

Super-short viva answer

“GCS checks consciousness by looking at eyes, talking, and movement. Eyes are out of 4, verbal response is out of 5, and motor response is out of 6. The total is out of 15. We report the separate parts too, for example E3 V4 M6 equals GCS 13/15. A lower score means the person is less awake. GCS 8 or below is serious and needs urgent airway assessment.”

Memory line

Eyes 4, Voice 5, Movement 6.
EVM makes 15.

Memory

• Magnesium is important for normal nerve and brain function.
• But there is not good evidence that magnesium glycinate improves memory in healthy adults.
• A 2024 systematic review found too few good-quality trials of magnesium supplements to conclude that they improve cognition or prevent memory decline. Chen et al., 2024

Stress and anxiety

• It may modestly improve subjective anxiety symptoms in some people, especially if magnesium intake is low or they have mild anxiety-related symptoms.
• But the research is mixed and many studies are small or low quality. A systematic review found the evidence suggestive, not conclusive. Boyle et al., 2017
• Magnesium glycinate contains magnesium bound to glycine. It is often chosen because it tends to be gentler on the stomach than forms such as magnesium citrate or oxide. That does not mean glycinate itself is proven better for stress or memory.

If you want to try it

• Check the label for elemental magnesium, not just “magnesium glycinate.” These are not the same number.
• A cautious supplement amount is often 100-200 mg elemental magnesium daily, preferably in the evening or with food. Do not stack it unknowingly with multivitamins, antacids, or laxatives containing magnesium.
• In the US, the general upper limit from supplements and medicines for adults is 350 mg/day of elemental magnesium, unless a clinician recommends otherwise. Food magnesium does not count toward this limit. The NIH fact sheet notes that excess supplemental magnesium can cause diarrhea, nausea, and cramps.

Do not self-start or use only with medical advice if you have

• Kidney disease or reduced kidney function
• Heart rhythm/conduction problems
• Pregnancy or breastfeeding
• Significant weakness, confusion, recurrent vomiting, or suspected electrolyte imbalance

Drug interactions

• Tetracycline or quinolone antibiotics
• Levothyroxine
• Bisphosphonates for osteoporosis

Bottom line

• For stress: reasonable to try if safe for you, but expect a possible mild benefit, not a treatment for an anxiety disorder.
• For memory: do not rely on it. Sleep, exercise, treatment of anxiety/depression, adequate nutrition, and checking issues such as B12 deficiency, thyroid disease, anemia, or poor sleep usually matter much more.