Recognising Reduced Consciousness for Student Nurses
Learn how to recognise a change in responsiveness, assess consciousness systematically and understand why increasing drowsiness or reduced responsiveness can indicate serious patient deterioration.
What does reduced consciousness look like?
Reduced consciousness can range from subtle drowsiness to complete unresponsiveness. The important question is whether the patient's level of alertness has changed from their usual baseline.
Increasing drowsiness
The patient may repeatedly fall asleep or need more stimulation to maintain attention.
Slower reactions
Responses to questions or instructions may become delayed, confused or less appropriate.
Reduced responsiveness
A patient who responds only to stronger stimulation or becomes unresponsive requires urgent assessment.
A simple way to assess responsiveness
AVPU provides a rapid bedside description of consciousness and is used within NEWS2. It helps identify a change that may require further neurological assessment.
Alert
The patient is awake and appropriately responsive without requiring stimulation.
Voice
The patient is not fully alert but responds when spoken to.
Pain or unresponsive
Reduced response to stimulation or no response indicates significant neurological impairment and requires escalation.
A new change matters
A patient moving from alert to responding only to voice represents deterioration even if they are still able to answer some questions.
Reduced consciousness affects more than “D”
Airway
Reduced consciousness can compromise the patient's ability to maintain and protect their airway.
Breathing
Assess respiratory rate, depth, pattern, oxygen saturation and respiratory effort.
Circulation
Review pulse, blood pressure, capillary refill and peripheral perfusion.
Disability
Assess level of consciousness, pupils and blood glucose where appropriate and according to local practice.
Exposure
Look for evidence of injury, infection, bleeding, medication or another relevant cause while maintaining dignity.
Escalate early
A significant change in consciousness warrants timely registered or emergency support according to local policy.
What might cause consciousness to fall?
| Possible context | Other clues | Clinical thinking |
|---|---|---|
| Hypoxia | Breathlessness, low SpOâ‚‚, tachypnoea or increased work of breathing. | Reduced oxygen delivery can affect neurological function. |
| Low blood glucose | Sweating, behavioural change, weakness or confusion. | Glucose abnormalities are an important reversible cause of altered consciousness. |
| Medication or substances | Recent opioid, sedative or other relevant medication. | Some medicines can depress consciousness and respiration. |
| Neurological event | New weakness, speech change, seizure or other neurological signs. | Sudden neurological deterioration requires urgent assessment. |
| Infection or sepsis | Temperature change, tachycardia, hypotension or altered respiration. | Reduced consciousness can occur in severe systemic illness. |
| Circulatory compromise | Hypotension, cool skin, weak pulse or prolonged capillary refill. | Poor cerebral perfusion may contribute to altered responsiveness. |
Do not assume sleepiness is harmless
A patient who is unexpectedly difficult to wake needs assessment, particularly if their respiratory rate, oxygenation, blood pressure or other observations have also changed.
Signs that increase concern
- The patient is newly difficult to wake.
- They respond only to voice or stronger stimulation.
- They become completely unresponsive.
- Respiratory rate becomes very slow, shallow or irregular.
- Oxygen saturation is falling.
- There is new weakness, facial asymmetry or speech disturbance.
- Blood pressure is falling or circulation appears poor.
- There has been a seizure or possible head injury.
- Blood glucose is significantly abnormal.
- The patient's overall condition is rapidly deteriorating.
Notice subtle deterioration early
Alert and talking
The patient is fully awake, conversing normally and engaging with care.
Increasingly sleepy
They repeatedly close their eyes and need prompting to maintain conversation.
Responds only to voice
This is a clear change in neurological status and should not be dismissed as normal tiredness.
Document and communicate the change
“Patient appears drowsy” is less useful than explaining that they were alert one hour ago and now require repeated verbal stimulation to respond.
Putting the findings together
Example
Earlier in the shift, a patient was awake, orientated and talking normally.
You now notice that they repeatedly fall asleep and are difficult to wake.
Their respiratory rate has fallen to 9 breaths per minute and their breathing appears shallow.
Oxygen saturation is also falling compared with earlier observations.
The concern is the combined pattern of reduced consciousness, slow breathing and worsening oxygenation.
As a student nurse, recognise this as potentially serious deterioration and seek urgent registered or emergency support according to local procedures.
Consciousness assessment errors to avoid
- Assuming the patient is simply tired. Establish whether their level of alertness has changed.
- Assessing consciousness without checking breathing. Reduced consciousness may compromise airway and ventilation.
- Ignoring medications. Recent sedatives or opioids may be relevant.
- Ignoring blood glucose. Glucose disturbance is an important potentially reversible cause.
- Looking only at AVPU. Use it within a broader ABCDE assessment.
- Delaying escalation while repeatedly trying to wake the patient. Significant deterioration needs prompt help.
Recognise → assess → communicate → escalate
Notice reduced responsiveness
Identify new drowsiness, confusion, reduced response or unresponsiveness.
Use ABCDE
Assess airway, breathing, circulation, consciousness, glucose where appropriate and the wider clinical picture.
Describe the change clearly
Explain the patient's previous baseline, current responsiveness and associated physiological deterioration.
Recognising Chest Pain for Student Nurses
Learn how to assess new chest pain, identify associated warning signs and understand when chest symptoms may indicate serious cardiovascular or respiratory deterioration.
Continue to Recognising Chest Pain →