Recognising Shock for Student Nurses
Learn how to recognise possible shock, assess circulation and perfusion, and identify patterns of physiological change that may indicate rapidly worsening patient deterioration.
What is shock?
Shock occurs when the circulation is unable to deliver enough oxygenated blood to meet the body's tissue needs. It can have several causes and may progress rapidly if the underlying problem is not recognised and treated.
Perfusion falls
Inadequate blood flow can reduce delivery of oxygen and nutrients to vital organs.
Compensation
The body may initially compensate with tachycardia and peripheral vasoconstriction before blood pressure falls dramatically.
Recognise patterns
Shock is recognised from the whole clinical picture rather than one isolated observation.
What might shock look like?
The presentation depends on the cause and stage of illness, but several physiological and clinical changes may appear together.
| Assessment area | Possible finding | Why it matters |
|---|---|---|
| Pulse | Increasing heart rate, weak peripheral pulse or change from baseline. | The cardiovascular system may be attempting to maintain perfusion. |
| Blood pressure | Falling systolic pressure or a significant downward trend. | Hypotension may develop as compensation becomes inadequate. |
| Skin and perfusion | Cool, pale, clammy or mottled skin and prolonged capillary refill. | Peripheral vasoconstriction and poor tissue perfusion may be present. |
| Respiration | Increasing respiratory rate or increased work of breathing. | The body may respond to reduced oxygen delivery and metabolic stress. |
| Consciousness | Restlessness, confusion, drowsiness or reduced responsiveness. | Neurological change may indicate reduced cerebral perfusion or severe illness. |
| Urine output | Reduced output where this is being monitored. | Reduced renal perfusion may form part of the clinical picture. |
Look for combinations
A rising pulse, cool peripheries and prolonged capillary refill alongside a downward blood pressure trend should carry far more weight than any one of those findings considered alone.
Shock is not one single condition
Several different processes can result in inadequate tissue perfusion. Student nurses do not need to diagnose the precise type from bedside observations alone, but understanding the broad categories can support clinical reasoning.
Reduced circulating volume
May occur with significant bleeding or major fluid loss.
Abnormal distribution
Can occur in conditions such as severe infection or anaphylaxis.
Impaired circulation
May result from severe cardiac dysfunction or obstruction to normal circulation.
Your role is recognition, not guessing
As a student nurse, focus on identifying deterioration, collecting accurate information and communicating what you have found. The priority is timely assessment and escalation.
Use ABCDE when shock is suspected
Airway
Check that the airway is patent and identify any immediate airway threat.
Breathing
Assess respiratory rate, oxygen saturation, work of breathing, oxygen therapy and overall respiratory condition.
Circulation
Assess pulse, blood pressure, capillary refill, skin, obvious bleeding and other evidence of perfusion.
Disability
Assess consciousness, new confusion and other neurological changes.
Exposure
Look for relevant causes or signs while maintaining dignity and preventing unnecessary heat loss.
Escalate
Seek appropriate registered or emergency support early and follow local deterioration and emergency procedures.
Signs that should increase concern
- A rapidly rising or unusually weak pulse.
- A falling systolic blood pressure or significant change from baseline.
- Cool, pale, clammy or mottled skin.
- Prolonged capillary refill.
- Increasing respiratory rate or respiratory distress.
- New confusion, agitation, drowsiness or reduced responsiveness.
- Reduced urine output where this is being monitored.
- Evidence of significant bleeding, fluid loss, severe infection or another major acute illness.
- Several NEWS2 parameters deteriorating together.
Putting the observations together
Example
Earlier in the shift, your patient's pulse was 78 bpm and blood pressure was 128/76 mmHg.
They now appear pale and clammy. Their pulse is 118 bpm, blood pressure has fallen to 96/60 mmHg and capillary refill is prolonged.
Their respiratory rate has increased and they say they feel weak and dizzy.
This is a pattern of worsening circulation and possible shock, not simply a single abnormal blood pressure reading.
As a student nurse, recognise the deterioration, obtain accurate observations and seek prompt registered or emergency support in line with local procedure.
Shock recognition errors to avoid
- Waiting for severe hypotension. Earlier signs of poor perfusion may already be present.
- Looking at blood pressure alone. Assess pulse, perfusion, respiration and consciousness.
- Ignoring trends. A falling blood pressure and rising pulse can be more important than either value alone.
- Assuming cool hands are insignificant. Consider them alongside capillary refill and the wider circulation assessment.
- Trying to diagnose the exact type of shock before escalating. Recognition and timely communication come first.
- Delaying escalation while repeatedly rechecking observations. If the patient is deteriorating, seek help promptly.
Recognise → assess → communicate → escalate
Notice poor perfusion
Identify changes in pulse, skin, blood pressure, capillary refill, breathing or consciousness.
Use ABCDE
Build a structured picture of the patient's condition and compare current findings with previous observations.
Act early
Report the pattern of deterioration clearly and obtain appropriate registered or emergency support.
Further learning: Resuscitation Council UK — ABCDE approach and Royal College of Physicians — NEWS2 .
ABCDE Assessment for Student Nurses
Continue by bringing airway, breathing, circulation, disability and exposure together into one systematic assessment of the deteriorating patient.
Continue to ABCDE Assessment →