Pratique

Paediatric Early Warning Score (PEWS)

PEWS — Paediatric Early Warning Score

3 domains (0–3 each) + modifiers. Score ≥3 = urgent, ≥5 = emergency.

Behaviour

Cardiovascular

Respiratory

Additional Modifiers (+2 each)

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Qu'est-ce que Paediatric Early Warning Score (PEWS)?

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The Paediatric Early Warning Score (PEWS) is a structured clinical tool designed to detect physiological deterioration in hospitalised children before they progress to critical illness or cardiac arrest. Paediatric in-hospital cardiac arrest has a worse survival rate than adult arrest, making early recognition of the deteriorating child a top patient safety priority. PEWS aggregates objective observations across three physiological domains — behaviour/neurological status, cardiovascular status, and respiratory status — into a numerical score, with additional points for nebuliser use or persistent vomiting. Each domain is scored 0-3, giving a maximum aggregate score of 9 before modifiers. Studies have shown that a PEWS of 3 or above is associated with significantly increased risk of PICU admission, and scores of 5 or above carry a very high sensitivity for clinical deterioration requiring emergency response. PEWS was originally developed by Brighton and Royal College of Nursing teams in the United Kingdom and has been adapted and validated across multiple healthcare systems globally, including the Monaghan PEWS and Canadian PEWS tools. When combined with structured escalation pathways such as the PEWS-based Paediatric Observation Priority Early Warning Score or the SBAR communication framework, PEWS dramatically reduces response times to deteriorating children and improves outcomes. The score is typically assessed every 1-4 hours in ward settings, with higher-frequency monitoring mandated as the score rises, ensuring that children with worsening physiology are caught on a rising trajectory rather than at the point of collapse.

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Formule

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f(x)

PEWS = Behaviour(0-3) + Cardiovascular(0-3) + Respiratory(0-3) + Modifier(+2 for nebuliser/persistent vomiting); Total 0-9+; Score ≥3 = urgent review; Score ≥5 = emergency response

Légende des variables

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Symbole	Nom	Unité	Description
C	Cardiovascular	0-3	Colour, capillary refill time, and heart rate deviation from age-normal
M	Modifier	0 or +2	+2 if child is receiving nebuliser or has persistent post-operative vomiting

Comment Paediatric Early Warning Score (PEWS)

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1Score Behaviour: 0 = playing/appropriate; 1 = sleeping; 2 = irritable; 3 = lethargic/confused or reduced response to pain.
2Score Cardiovascular: 0 = pink, CRT ≤2 sec; 1 = pale or CRT 3 sec; 2 = grey/dusky or CRT 4 sec or tachycardia >20 above normal; 3 = grey/mottled or CRT ≥5 sec or tachycardia >30 above normal or bradycardia.
3Score Respiratory: 0 = within normal parameters, no recession; 1 = >10 above normal, using accessory muscles, or 30-50% O2/3-4L/min flow; 2 = >20 above normal, recession, or >50% O2/>4L/min; 3 = ≥5 below normal with recession and grunting, or ≥8L/min or >50% O2.
4Add 2 points if the child is receiving a nebuliser or has persistent vomiting after surgery — these indicate clinical instability that the core domains alone may not fully capture.
5Sum all components for the total PEWS score. Document alongside vital signs on the observation chart, applying age-specific normal range tables for heart rate and respiratory rate.
6Interpret the score: 0-2 = low risk, continue routine monitoring; 3-4 = increased risk, escalate to nurse-in-charge and increase monitoring frequency; ≥5 = high risk, immediate medical review and prepare for PICU escalation.
7Re-score after any intervention (e.g., oxygen, fluid bolus, bronchodilator) to assess response and determine whether further escalation is needed.

Exemples résolus

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Exemple 1Stable Child Post-Surgery

Donné:4-year-old, 6 hours post-tonsillectomy, sleeping, pink, CRT 2s, RR normal

Résultat:PEWS = 1 — Low risk

Routine 4-hourly observations; no escalation required

Sleeping post-operatively scores 1 for behaviour but this is expected. All other parameters are normal. A PEWS of 1 is reassuring but should be trended to confirm continued stability.

Exemple 2Child with Worsening Bronchiolitis

Donné:8-month-old, RR 62, moderate subcostal recession, on 35% O2, irritable, CRT 3s, receiving nebuliser

Résultat:PEWS = 7 — High risk; emergency medical review required

Activate PICU referral pathway; prepare for possible intubation

A PEWS of 7 with respiratory and cardiovascular involvement in an infant with bronchiolitis represents imminent respiratory failure. Immediate senior medical review and PICU notification is mandatory.

Exemple 3Febrile Child with Tachycardia

Donné:3-year-old with fever 39.5°C, HR 160 (>20 above normal for age), playing, RR slightly elevated, pink, CRT 2s

Résultat:PEWS = 3 — Urgent nurse-in-charge review

Reassess after antipyretic and fluid; rising score warrants medical review

Tachycardia >20 above the normal threshold for age contributes cardiovascular score of 2. Although the child is alert and playing, the score of 3 requires escalation and repeat observation after treatment.

Exemple 4Deteriorating Septic Child

Donné:5-year-old, lethargic, mottled skin, CRT 5s, RR 42 with grunting, on 60% O2

Résultat:PEWS = 9 — Critical; activate emergency response immediately

Paediatric sepsis — call crash team, initiate sepsis bundle, prepare RSI

Maximum PEWS score of 9 indicates critical deterioration. This child has signs of septic shock (mottling, prolonged CRT, decreased consciousness) with respiratory failure. Immediate resuscitation team activation and sepsis bundle initiation are essential.

Applications pratiques

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Ward-based monitoring of acutely ill children to detect deterioration before cardiac or respiratory arrest., representing an important application area for the Pews in professional and analytical contexts where accurate pews calculations directly support informed decision-making, strategic planning, and performance optimization

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Escalation trigger for paediatric rapid response team activation in hospitals with structured early warning systems., representing an important application area for the Pews in professional and analytical contexts where accurate pews calculations directly support informed decision-making, strategic planning, and performance optimization

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PICU referral decision support — a consistently high PEWS guides discussion about step-up to intensive care., representing an important application area for the Pews in professional and analytical contexts where accurate pews calculations directly support informed decision-making, strategic planning, and performance optimization

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Nursing handover structure — PEWS score is communicated alongside other clinical parameters to convey urgency and trajectory., representing an important application area for the Pews in professional and analytical contexts where accurate pews calculations directly support informed decision-making, strategic planning, and performance optimization

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Quality improvement and audit: PEWS data is used to benchmark response times and identify patterns in paediatric deterioration events across hospital networks., representing an important application area for the Pews in professional and analytical contexts where accurate pews calculations directly support informed decision-making, strategic planning, and performance optimization

Cas particuliers

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Child with Baseline Neurological Impairment

{'title': 'Child with Baseline Neurological Impairment', 'body': "Children with cerebral palsy, severe intellectual disability, or other conditions may have an atypical baseline behavioural score. The PEWS Behaviour domain should be scored relative to the individual child's baseline, not the population norm. Document the child's baseline PEWS at admission for reference."}

Post-Cardiac Surgery Patient

In the Pews, this scenario requires additional caution when interpreting pews results. The standard formula may not fully account for all factors present in this edge case, and supplementary analysis or expert consultation may be warranted. Professional best practice involves documenting assumptions, running sensitivity analyses, and cross-referencing results with alternative methods when pews calculations fall into non-standard territory.

Child Receiving Oxygen at Baseline

{'title': 'Child Receiving Oxygen at Baseline', 'body': 'A child with chronic lung disease who normally requires supplemental oxygen will always score positive on the respiratory O2 component. Baseline oxygen requirements should be documented and only incremental increases above baseline scored. Titrating to SpO2 target rather than absolute O2 flow is more clinically meaningful.'}

Neonates

PEWS Scoring Reference

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Domain	0	1	2	3
Behaviour	Playing/appropriate	Sleeping	Irritable	Lethargic/confused/unresponsive to pain
Cardiovascular	Pink, CRT ≤2s	Pale, CRT 3s	Grey, CRT 4s or HR >20 above norm	Grey/mottled, CRT ≥5s or HR >30 above norm or bradycardia
Respiratory	Normal rate, no recession	RR >10 above norm or mild accessory use	RR >20 above norm, recession, O2 >50%	RR ≥5 below norm with grunting or O2 ≥8L/min
Modifiers	+2 for nebuliser or persistent vomiting after surgery

Questions fréquentes

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What is the Paediatric Early Warning Score (PEWS) and how is it used?

The Paediatric Early Warning Score (PEWS) is a clinical tool used to detect physiological deterioration in hospitalised children. It is based on a combination of vital sign parameters, such as heart rate, respiratory rate, blood pressure, oxygen saturation, and level of consciousness. The score is calculated by assigning points to each parameter based on its deviation from normal ranges, with higher scores indicating greater severity of illness. For example, a child with a heart rate of 180 beats per minute would score 2 points, while a child with a respiratory rate of 40 breaths per minute would score 1 point.

How is the PEWS score interpreted and what are the typical ranges for different levels of concern?

The PEWS score is typically interpreted as follows: a score of 0-2 indicates a low level of concern, 3-4 indicates a moderate level of concern, and 5 or higher indicates a high level of concern. For example, a child with a score of 0-2 would be considered stable and requiring routine monitoring, while a child with a score of 5 or higher would require immediate attention and potential escalation of care. In general, scores above 7 are associated with a high risk of cardiac arrest or critical illness, and scores above 10 are associated with a very high risk of mortality.

What are some common mistakes to avoid when using the PEWS score in clinical practice?

One common mistake is failing to regularly reassess the child's vital signs and update the PEWS score, as this can lead to delayed detection of deterioration. Another mistake is relying solely on the PEWS score and neglecting to consider other clinical factors, such as the child's medical history and physical examination findings. Additionally, using outdated or incorrect normal ranges for vital sign parameters can lead to inaccurate scoring and interpretation.

Can you provide an example of how the PEWS score would be used in a real-world clinical scenario?

For example, a 4-year-old child is admitted to the hospital with a diagnosis of pneumonia and is initially stable with a PEWS score of 1. However, over the next few hours, the child's respiratory rate increases to 45 breaths per minute and oxygen saturation decreases to 88%. The child's PEWS score would increase to 5, indicating a high level of concern and prompting the healthcare team to re-evaluate the child's condition and consider escalating care, such as administering oxygen therapy or consulting with a pediatric intensive care specialist.

How often should the PEWS score be reassessed in hospitalised children, and what are the key parameters to monitor?

The PEWS score should be reassessed at least every 4-6 hours in hospitalised children, or more frequently if the child's condition is unstable or deteriorating. Key parameters to monitor include heart rate, respiratory rate, blood pressure, oxygen saturation, and level of consciousness, as these are the primary components of the PEWS score. Additionally, other clinical factors, such as temperature, capillary refill time, and urine output, should also be monitored to provide a comprehensive assessment of the child's condition.

Erreurs courantes à éviter

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!Using adult vital sign normal ranges instead of age-specific paediatric ranges for heart rate and respiratory rate scoring.
!Documenting a spot PEWS without trending — a rising trajectory (e.g., 1 → 2 → 3 over 2 hours) is as important as the absolute score.
!Omitting the nebuliser modifier, underscoring a child in active respiratory distress.
!Delaying escalation because the child 'looks well' despite a PEWS of 4 — children can compensate effectively until sudden decompensation.
!Failing to recheck PEWS after an intervention to confirm response — a child who fails to improve with oxygen therapy needs further escalation even if the score temporarily appears unchanged.

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Conseil Pro

Always trend the PEWS over time and note the rate of change. A child whose score rises from 2 to 4 over one hour is more concerning than a stable child with a score of 4. Document the trigger for any escalation and the response, including who was contacted and at what time — this creates an auditable clinical safety record.

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Le saviez-vous?

The first validated PEWS was published by Monaghan in 2005 following a series of preventable paediatric cardiac arrests in UK hospitals. The NHS subsequently mandated structured observation and escalation systems for all hospitalised children, resulting in measurable reductions in unexpected paediatric deaths — a remarkable example of a simple scoring tool driving systemic safety improvement.

Références

📖Difficulté:Intermédiaire

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