Croup nursing: steeple sign, Westley scoring, and dexamethasone vs epinephrine

Croup – formally called laryngotracheobronchitis – is a viral upper respiratory illness that causes subglottic inflammation, producing the barky, seal-like cough that makes it unmistakable at the bedside. It is the most common cause of infectious stridor in children, predominantly affecting those between 6 months and 3 years of age, with a peak incidence in the second year of life. It affects about 3% of children in that age band each year, fewer than 5% of affected children are hospitalized, and only 1–3% of those admitted need intubation (AAFP 2018).

For nursing students, croup is high-yield on two fronts. Clinically, it requires careful airway monitoring, knowing when to escalate from observation to dexamethasone to racemic epinephrine, and understanding how to minimize agitation – because distress worsens obstruction. On NCLEX, croup is almost always tested in contrast to epiglottitis, requiring students to distinguish two pediatric airway emergencies that share surface-level similarities but differ sharply in etiology, presentation, imaging, and management.

The fundamentals: parainfluenza type 1 is the dominant viral cause, the steeple sign on AP neck X-ray confirms subglottic narrowing, the Westley Croup Score guides treatment escalation, and nebulized epinephrine requires a post-nebulization observation period (at least 2 hours per AAFP 2018 and TREKK 2023) because its effect wears off. These four facts appear on NCLEX with regularity.

Quick reference: croup at a glance

Pathophysiology and etiology

Croup is an infection of the subglottic airway – the region just below the vocal cords, encompassing the larynx, trachea, and often the bronchi. Understanding why croup is predominantly a disease of toddlers requires understanding the anatomy of the infant and toddler airway.

Why toddlers are uniquely vulnerable

The subglottic space is the narrowest point of the pediatric airway. In infants and young children, this diameter is typically 4–5 mm – roughly the diameter of a drinking straw. Even 1 mm of circumferential inflammatory edema reduces the cross-sectional area of the airway by approximately 75%, producing exponentially greater resistance to airflow (described by Poiseuille’s law: resistance is inversely proportional to the fourth power of the radius). This is why a toddler with croup can have severe respiratory distress from what might appear to be minor mucosal swelling. Adults and older children have a larger subglottic lumen and proportionally greater cartilaginous rigidity, making them far less susceptible to the same degree of obstruction.

The inflammatory cascade

After viral inoculation of the upper respiratory mucosa, the virus replicates in the epithelium lining the subglottis. The host immune response generates local inflammation: capillary dilation, mucosal edema, increased secretions, and cell infiltration. The edematous mucosa narrows the subglottic lumen. As air passes through this narrowed segment at increased velocity (per Bernoulli’s principle), the surrounding tissue vibrates, producing inspiratory stridor. In severe cases, the obstruction becomes sufficient to impair air entry during both inhalation and exhalation, generating biphasic stridor – a sign of critical narrowing.

Viral causes

Spasmodic croup vs. viral croup

Spasmodic croup deserves separate attention because it recurs in the same child and presents without a viral prodrome – features that differentiate it sharply from classic viral laryngotracheobronchitis.

Viral croup follows a 1–3 day prodrome of low-grade fever, rhinorrhea, and mild cough before the barky cough and stridor appear. Symptoms typically worsen over the first 24–48 hours, then gradually resolve over 3–7 days.

Spasmodic croup appears suddenly, often awakening the child from sleep, with no preceding fever or viral illness. It resolves just as abruptly – often within hours – without treatment, only to recur on subsequent nights. The cause is not fully understood; atopy, gastroesophageal reflux, and mild viral triggers have all been implicated. On NCLEX, the distinguishing feature is the absence of fever and viral prodrome.

Clinical presentation

The barky cough

The hallmark of croup is a cough described as sounding like a barking seal or a dog – dry, brassy, and resonant. It results from air vibrating through the inflamed, narrowed subglottis. Parents frequently recognize it immediately and bring the child to the emergency department overnight.

Inspiratory stridor

Stridor is a high-pitched, musical sound generated by turbulent airflow through a narrowed segment of the upper airway. In croup, it occurs on inspiration because the subglottic obstruction is partially dynamic – negative inspiratory pressure causes further collapse of the already-narrowed, inflamed mucosa. At rest in a calm child with mild-to-moderate croup, stridor may be absent or heard only with a stethoscope over the neck. Stridor audible across the room at rest indicates more severe obstruction. Biphasic stridor (heard on both inspiration and exhalation) signals critical narrowing and impending respiratory failure.

Associated features

• Hoarseness – edema of the vocal cords immediately above the subglottis produces a characteristic hoarse or muffled quality to the voice and cry. This differs from epiglottitis, in which the voice is muffled in a “hot potato” quality due to supraglottic involvement.
• Low-grade fever – typically 38.0–39.0°C (100.4–102.2°F). High fever (>39.5°C) should raise concern for bacterial tracheitis, epiglottitis, or secondary bacterial superinfection. Review pediatric vital signs by age for normal reference ranges.
• Nocturnal worsening – symptoms characteristically worsen at night. The mechanism is not established; proposed contributors include recumbent positioning increases upper airway secretions, circadian cortisol levels drop overnight (reducing endogenous anti-inflammatory effect), and cool night air may intensify mucosal irritation.
• Retractions – subcostal, intercostal, and suprasternal retractions reflect increased work of breathing as the child labors to pull air through the narrowed subglottis.
• Restlessness and agitation – in moderate-to-severe croup, hypoxia-driven agitation is a clinical red flag. A child who is too quiet or too exhausted to cry may be approaching respiratory failure – not improving.

Westley Croup Score

The Westley Croup Score is the validated tool used to objectively grade croup severity. It scores five clinical parameters and guides treatment escalation decisions. It is the most widely used croup score in research and emergency department pathways.

Total score range: 0–17

Severity bands below follow the AAFP 2018 review. Cutoffs differ between pathways: the Canadian TREKK 2023 bottom-line recommendations, for example, call 3–4 moderate, 5–7 severe, and above 8 impending respiratory failure. Use the scheme your facility’s pathway specifies.

Clinical note: Cyanosis and altered consciousness carry disproportionately high point values (4–5 points each) because they represent severe physiologic compromise. Any cyanosis at rest or altered mental status in a child with croup is a code-level concern requiring immediate escalation to the provider and preparation for airway management.

Diagnostics

Clinical diagnosis

Croup is a clinical diagnosis in the vast majority of cases. The combination of barky cough, inspiratory stridor, hoarseness, and low-grade fever in a child aged 6 months to 3 years is sufficient to diagnose and begin treatment. Laboratory studies are not routinely indicated for uncomplicated croup.

AP neck X-ray: the steeple sign

Plain radiography of the neck is obtained when the diagnosis is uncertain, when the child does not respond to initial treatment, or when there is concern for an alternative diagnosis (such as epiglottitis, bacterial tracheitis, or foreign body aspiration).

On an anterior-posterior (AP) view of the neck, croup produces the steeple sign: the normally broad, shouldered subglottic airway narrows symmetrically into a tapered, pointed column – resembling the inverted V shape of a church steeple. This appearance reflects the circumferential mucosal edema below the vocal cords.

Interpreting the steeple sign for NCLEX:

• It appears on an AP (frontal) view of the neck – not lateral.
• It represents subglottic narrowing – below the vocal cords.
• A lateral neck X-ray is used for epiglottitis, where it reveals the thumb sign (swollen epiglottis).
• The steeple sign supports the diagnosis but is neither perfectly sensitive nor specific – some children with croup have a normal X-ray, and the sign can appear in other conditions causing subglottic edema.
• X-ray should never be performed if epiglottitis is suspected – transporting a child with epiglottitis to radiology risks complete obstruction away from resuscitation equipment.

Pulse oximetry

Continuous pulse oximetry monitoring is standard for any child with moderate or severe croup. A drop in SpO2 below 92% is a late sign of severe obstruction – children compensate remarkably well until they decompensate suddenly. Do not be reassured by a normal SpO2 in a child with significant work of breathing. Review the full head-to-toe assessment framework for respiratory monitoring integration.

Medical management

Dexamethasone

Corticosteroids reduce the inflammatory edema in the subglottis and are the cornerstone of croup pharmacotherapy. Dexamethasone is the preferred agent because of its long duration of action and potent anti-inflammatory effect. Its biologic half-life is 36–54 hours (some sources give 36–72), which is the number that matters clinically and the reason a single dose suffices. Its plasma half-life is far shorter, around 3.5–4.5 hours – the anti-inflammatory effect outlasts the measurable drug level because it works through altered gene transcription rather than direct receptor occupancy.

Key prescribing details:

• Dose: 0.6 mg/kg is the most commonly used dose (AAFP 2018). The 2023 Cochrane review found high-certainty evidence of no difference between 0.15 and 0.6 mg/kg in croup score at 2 hours or in return visits and readmissions, though one small trial favored 0.6 mg/kg at 24 hours. TREKK 2023 recommends 0.15–0.6 mg/kg with a 12 mg maximum per dose; follow your facility’s cap.
• Route: Oral (PO) is preferred – bioavailability is equivalent to parenteral, it avoids the distress of injection, and it is more cost-effective. IM or IV is used when the child cannot tolerate oral medication.
• Frequency: A single dose is sufficient. The extended half-life maintains anti-inflammatory effect for 48–72 hours – repeat dosing is not routinely indicated.
• Onset: Improvement in croup score is measurable by 2 hours in pooled trials (Cochrane 2023), and some trials report an effect from about 30 minutes.
• Application: Given for all croup severity levels (mild through severe). Even children with mild croup benefit from a single dose; TREKK 2023 recommends it for every child who presents to the ED with croup.

Racemic epinephrine

Nebulized racemic epinephrine (a 1:1 mixture of the D- and L-isomers of epinephrine) is indicated for moderate-to-severe croup. It acts via alpha-1 adrenergic vasoconstriction of the subglottic mucosal vasculature, rapidly reducing edema. The 2013 Cochrane review found a clear improvement in croup score 30 minutes after treatment that was no longer significant at 2 and 6 hours.

Dosing (AAFP 2018): racemic epinephrine 2.25% 0.05 mL/kg (maximum 0.5 mL), diluted in normal saline, via nebulizer; or L-epinephrine 1:1,000 (1 mg/mL) 0.5 mL/kg (maximum 5 mL). TREKK 2023 uses a flat 5 mg (5 mL of 1 mg/mL) L-epinephrine dose and allows repeat doses in severe croup. The Cochrane review found no difference between racemic and L-epinephrine at 30 minutes.

The rebound phenomenon – critical NCLEX content:

The vasoconstrictive effect of nebulized epinephrine is transient: the measurable benefit fades by about 2 hours. As the drug wears off, the mucosal edema that was transiently reduced by vasoconstriction can re-expand, returning stridor and respiratory distress toward pre-treatment levels. This is commonly called the rebound effect, though the child is returning to the underlying disease state rather than overshooting it, which is why dexamethasone must already be on board.

Mandatory post-nebulization observation period: Any child who receives racemic epinephrine must be observed after the last nebulization rather than discharged straight away – the child may appear well during peak drug effect and deteriorate after returning home. Current guidance sets the minimum at 2 hours after the last nebulization (AAFP 2018; TREKK 2023), and many institutional pathways and older textbooks use a longer 3–4 hour window. Whichever window your facility uses, the child must be free of stridor and retractions at rest at the end of it, and dexamethasone must have been given, before discharge with return precautions. If stridor at rest returns, re-treat and reassess; persistent stridor at rest with distress more than 4 hours after dexamethasone and repeated epinephrine is an admission criterion (TREKK 2023).

Heliox

Heliox (70–80% helium / 20–30% oxygen) is a low-density gas mixture that reduces the turbulent flow resistance through a narrowed airway. The 2021 Cochrane review found the evidence on its benefit in croup uncertain, AAFP 2018 does not recommend it, and TREKK 2023 states there is not enough evidence for routine use.

At most, heliox is a bridging trial in impending respiratory failure – TREKK 2023 allows it there provided it does not delay proven treatments (dexamethasone, repeated epinephrine, airway preparation). It is not available in all facilities and is never first-line therapy.

Intubation criteria

Intubation is rare: fewer than 5% of children with croup are hospitalized, and only 1–3% of those need intubation (AAFP 2018). It is life-saving when indicated. Clinical signals that intubation is becoming necessary:

• Worsening stridor at rest despite racemic epinephrine and dexamethasone
• Increasing retractions and accessory muscle use
• SpO2 declining despite supplemental oxygen
• Exhaustion – the child who was previously agitated is now too fatigued to maintain respiratory effort
• Altered level of consciousness
• Apnea or gasping respirations

When intubation is performed for croup, use an endotracheal tube (ETT) 0.5 mm smaller than the age-based standard size to account for the subglottic narrowing. Forcing a standard-sized ETT through an inflamed subglottis can worsen mucosal injury and post-extubation edema. This detail appears on NCLEX and in clinical practice.

Nursing interventions

Priority 1: maintain a patent airway

Airway status is the primary concern in every child with croup, not just those with severe disease. Mild croup can deteriorate rapidly – particularly in the first night – if the child becomes significantly distressed or develops a secondary complication. Continuous monitoring of respiratory rate, effort, SpO2, and mental status is the nurse’s core function.

Deterioration signals requiring immediate provider notification:

• Stridor audible at rest (where previously absent)
• New or increasing retractions
• SpO2 < 92% on room air
• Child becoming excessively sleepy or difficult to rouse
• Cyanosis – any cyanosis is an emergency
• Biphasic stridor

Priority 2: minimize agitation

Agitation significantly worsens airway obstruction in croup. A crying or distressed child generates markedly increased inspiratory effort, which amplifies the dynamic collapse of the already-narrowed subglottis. Every avoidable source of distress should be eliminated.

Minimize agitation by:

• Keeping the child in the parent’s or caregiver’s arms whenever possible – this is the most effective single intervention
• Deferring non-urgent procedures (IV insertion, blood draws, vital signs) until the child has been stabilized with dexamethasone
• Using a calm, quiet approach; dim the room if possible
• Keeping parents calm – parental anxiety transfers directly to the child
• Avoiding prolonged examination – assess, then step back

This principle connects to the pediatric nursing assessment framework – the ABCDE approach still applies, but the manner of assessment must be adapted to minimize procedural distress.

Priority 3: positioning

Position the child upright – sitting up in the parent’s lap is ideal. Upright positioning reduces upper airway edema (gravity-dependent drainage of secretions), maintains open airway geometry, and decreases the sense of dyspnea. Do not force a supine position. Do not use restraints unless there is a specific clinical indication.

For oxygen delivery, a blow-by technique (holding oxygen tubing near the child’s face rather than applying a mask) is better tolerated than a tight-fitting mask that may distress the child and worsen obstruction.

Priority 4: medication administration

• Administer dexamethasone as ordered – oral is preferred. Mix with a small amount of juice if needed to improve palatability.
• For nebulized epinephrine: administer with the child in the parent’s lap. Document the time of administration precisely – the observation clock (at least 2 hours, or your pathway’s longer window) runs from the last dose.
• Monitor for epinephrine rebound during the observation period. Reassess stridor, work of breathing, and SpO2 at 30 minutes, 60 minutes, 2 hours, and 4 hours post-nebulization.

Priority 5: avoid distressing throat examination

In croup the problem is distress more than the exam itself: a forced tongue-depressor inspection that makes the child cry increases inspiratory effort and worsens dynamic obstruction, and croup is diagnosed clinically without it. The absolute rule belongs to epiglottitis, where manipulating a swollen supraglottis can precipitate complete obstruction – so if epiglottitis has not been excluded (drooling, toxic appearance, tripod positioning, minimal cough), do not examine the throat at all.

For comparison, see the epiglottitis nursing reference – in that condition, the no-throat-exam rule is even more absolute.

Priority 6: supplemental oxygen

Supplemental oxygen is commonly started when SpO2 falls below 92% or when the child shows significant respiratory distress regardless of oxygen saturation. Use blow-by technique in young, distressed children. A nasal cannula is reasonably well tolerated if the child is not in severe distress.

Priority 7: monitor for complications

• Bacterial tracheitis (pseudomembranous croup): A rare but serious bacterial superinfection – most commonly caused by Staphylococcus aureus – that presents with sudden worsening of croup-like symptoms, high fever, toxic appearance, and failure to respond to dexamethasone and epinephrine. Requires antibiotics and often intubation.
• Respiratory failure: As described above – exhaustion and declining SpO2 despite maximal medical management.
• Pulmonary edema: Negative-pressure pulmonary edema can occur in severe croup from the high negative intrathoracic pressures generated during severe obstruction.

The asthma nursing reference covers similar themes of airway inflammation, reversible obstruction, and medication-driven management – a useful comparison for respiratory physiology context.

NCLEX differentiation: croup vs. epiglottitis

This comparison table is among the highest-yield content for NCLEX pediatric respiratory questions. Know every row.

Parent teaching and discharge criteria

Discharge criteria after racemic epinephrine

A child who received racemic epinephrine may be discharged only when all of the following are met:

• At least 2 hours have elapsed since the last nebulization (or your pathway’s longer window, often 3–4 hours)
• Dexamethasone has been given
• No inspiratory stridor at rest (stridor with crying or activity may persist)
• No signs of respiratory distress such as suprasternal, intercostal, or chest wall retractions
• Normal level of consciousness and color
• Parent/caregiver can bring the child back if there is any deterioration, and has received croup education and return instructions

TREKK 2023 recommends admission if stridor at rest and respiratory distress persist more than 4 hours after dexamethasone and repeated doses of nebulized epinephrine, or if social or logistical concerns would prevent a return visit.

For mild croup without racemic epinephrine

Children with mild croup (no stridor at rest, no retractions; Westley score ≤2) can be discharged home after a single oral dose of dexamethasone without an observation period (TREKK 2023). Children with moderate croup are observed after dexamethasone until stridor at rest and retractions resolve, usually 2–4 hours.

Home management teaching

Teach parents:

• Cool night air – taking the child outdoors briefly into cool night air, or opening a window, can reduce symptoms. This was long a folk remedy, but a 2023 randomized controlled trial gave it an evidence base: 30 minutes of outdoor cold air (below 10°C) as an adjunct to oral dexamethasone dropped the Westley score by ≥2 points in 49.2% of children versus 23.7% kept indoors, with the largest benefit in moderate croup.
• Cool mist humidifier – parents often ask about this, and it is harmless, but be honest about the evidence. Randomized trials and a systematic review have found no meaningful benefit from humidified air in croup, including trials using 100% humidity with particles sized to deposit in the larynx. Mist therapy is no longer a recommended treatment. If a family finds a humidifier soothing there is no reason to stop them, but it should not displace dexamethasone or delay a return to care.
• Avoid steam from hot showers – the historical practice of taking children into a steamy bathroom has fallen out of favor, and it carries a scald risk. Cool air is the better option.
• Upright positioning during sleep – elevate the head of the crib or bed. Do not allow infants to sleep in a position that flexes the neck.
• Fever management – acetaminophen or ibuprofen (per age-appropriate dosing) for comfort. Avoid aspirin in children.
• Hydration – encourage adequate oral fluids. Dehydration worsens mucous viscosity and makes secretion clearance more difficult.
• No second-hand smoke – cigarette smoke significantly worsens respiratory irritation and is associated with more severe and prolonged croup episodes.
• Croup is contagious – the viruses spread by respiratory secretions and contaminated hands. Teach frequent handwashing and keeping the child away from other young children during the acute illness. In hospital, CDC isolation guidance lists Standard + Contact precautions for the duration of illness for parainfluenza and RSV in infants and young children; influenza requires droplet precautions, so add them if influenza is suspected.

Return precautions – call 911 or return to the ED immediately if:

• Stridor at rest (not just with crying)
• The barky cough returns after initial improvement
• Child is working hard to breathe – nasal flaring, neck or chest retractions visible
• Child appears blue around the lips or fingernails
• Child is extremely difficult to rouse or unusually quiet and limp
• Child cannot swallow or drools persistently (this suggests epiglottitis, not croup – call 911)
• Breathing becomes fast and shallow

NCLEX tips

1. The steeple sign is on an AP (frontal) neck X-ray – not lateral. The thumb sign (epiglottitis) is on a lateral X-ray. Know the view with the sign.

2. Nebulized epinephrine requires post-nebulization observation – at least 2 hours per AAFP 2018 and TREKK 2023, and 3–4 hours in many pathways and textbooks. The benefit fades by about 2 hours, so a child who looks good at 30 minutes may deteriorate when the drug wears off. Never discharge before the observation window ends.

3. Dexamethasone is a single-dose treatment for croup. The 36–54 hour biologic half-life (not the ~4 hour plasma half-life) means repeat dosing the next day is not standard practice – even if the child looks better in the morning.

4. Minimize agitation – this is a nursing priority, not just a comfort measure. Agitation worsens airway obstruction dynamically. Parent holding is the most effective calming intervention.

5. Croup does not cause drooling. Drooling in a child with stridor means epiglottitis until proven otherwise. Drooling = dysphagia = epiglottitis.

6. Never examine the throat when epiglottitis is possible – manipulation can precipitate complete, fatal obstruction. In croup, avoid any forced exam that makes the child cry, because distress worsens obstruction; the diagnosis is clinical.

7. Spasmodic croup has no fever and no viral prodrome – it wakes the child from sleep, resolves quickly, and recurs. Viral croup has a 1–3 day prodrome with low-grade fever before the barky cough appears.

8. Westley score thresholds (AAFP 2018): Mild ≤2 → dexamethasone + discharge. Moderate 3–7 → dexamethasone + consider nebulized epinephrine. Severe 8–11 → dexamethasone + nebulized epinephrine + likely admission. Score ≥12 → impending respiratory failure, emergent airway. Some pathways (TREKK 2023) use lower cutoffs, so use the one your question or facility specifies.

9. ETT sizing for intubation: Use 0.5 mm smaller than the age-based standard size to pass through the narrowed subglottis without traumatizing the edematous mucosa.

10. Parainfluenza type 1 is the most common cause of croup – the single most testable etiology fact. Parainfluenza types 1–3 together cause about 75% of cases, and type 1 has a fall epidemic pattern. RSV and influenza also cause croup but less frequently.

11. Cyanosis on the Westley score = 4–5 points instantly – cyanosis with agitation scores 4, at rest scores 5. A child with any cyanosis is at Westley ≥4 from that criterion alone. Treat this as severe.

12. Cool air, not steam – a 2023 RCT supports brief outdoor cold-air exposure as an adjunct to dexamethasone. Humidified air itself has repeatedly failed to show benefit in trials, so mist therapy is no longer recommended as treatment. NCLEX question banks may still reference humidification as a comfort measure; the exam-safe position is that it is supportive at best and never a substitute for corticosteroids.

13. Heliox is not routine therapy – it lowers flow resistance through a narrowed airway, but evidence of benefit is uncertain (Cochrane 2021). At most it is a trial in impending respiratory failure that must not delay dexamethasone, repeated epinephrine, or airway preparation.

14. RSV can cause croup – but it more typically causes bronchiolitis in infants under 12 months. When croup occurs in an infant under 6 months, consider RSV and review the RSV nursing reference for differentiating features.

Clinical summary

Croup is a self-limited viral illness in most children, but the small subglottic diameter of the toddler airway means even modest inflammation can produce significant obstruction. The nurse’s role is to accurately assess severity using the Westley Croup Score, position the child to minimize distress, administer dexamethasone for all severity levels, escalate to nebulized epinephrine for moderate-to-severe disease, and enforce the post-epinephrine observation period (at least 2 hours, longer where the pathway specifies).

On NCLEX, croup is tested primarily as a contrast to epiglottitis – master that differentiation table, and the majority of pediatric upper airway questions become manageable. The barky cough, steeple sign, Westley score, dexamethasone single dose, and the short duration of nebulized epinephrine are the five facts that recur most consistently across high-yield question banks.

For related airway and respiratory nursing content, see the pneumonia nursing reference for lower respiratory infection comparisons, and the asthma nursing reference for additional reversible airway obstruction pharmacology.

References

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[19] TREKK (Translating Emergency Knowledge for Kids). Bottom line recommendations: croup. Version 4.0. August 2023. https://trekk.ca/

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[21] Centers for Disease Control and Prevention. 2007 Guideline for isolation precautions: preventing transmission of infectious agents in healthcare settings, Appendix A: type and duration of precautions recommended for selected infections and conditions. Updated 2024. https://www.cdc.gov/infection-control/hcp/isolation-precautions/appendix-a-type-duration.html