What are the signs and symptoms of croup in children and what is the recommended emergency management?

Croup: Signs, Symptoms, and Emergency Management

For emergency management of croup, administer a single dose of dexamethasone 0.6 mg/kg orally (maximum 10-20 mg) for all severities, and add nebulized epinephrine 0.5 mL/kg of 1:1000 solution (maximum 5 mL) for moderate-to-severe cases with stridor at rest or significant respiratory distress.

Clinical Presentation

Classic Signs and Symptoms

Children with croup typically present with:

• Barky, "seal-like" cough - the hallmark symptom
• Inspiratory stridor - high-pitched sound during breathing in
• Hoarse voice - from vocal cord inflammation
• Respiratory distress signs: chest wall indrawing, use of accessory muscles, tracheal tug, sternal/subcostal/intercostal retractions 1, 2, 3

Additional Features

• Low-grade fever (though not required for diagnosis) 2
• Sudden onset of symptoms 4, 5
• Most commonly affects children 6 months to 3 years of age 2
• Symptoms may worsen with agitation or crying

Red Flags Requiring Immediate Attention

• Stridor at rest
• Cyanosis or "silent chest"
• Poor respiratory effort, fatigue, or exhaustion
• Agitation, restlessness, or altered consciousness
• Inability to speak, eat, or drink 6

Emergency Management Algorithm

Step 1: Initial Assessment and Severity Grading

Evaluate for:

• Respiratory rate: >50/min suggests severe disease
• Heart rate: >140/min suggests severe disease
• Work of breathing: accessory muscle use, retractions
• Stridor: only with crying (mild) vs. at rest (moderate-severe)
• Air entry: decreased breath sounds indicate severe obstruction 1

Step 2: Immediate Interventions

For ALL Severities:

• Dexamethasone 0.6 mg/kg PO/IV/IM (single dose, maximum 10-20 mg) - this is the cornerstone of treatment 2, 3, 4, 5
• Keep child calm (agitation worsens obstruction)
• Position of comfort (usually upright in caregiver's arms)

For Moderate-to-Severe Croup (stridor at rest, significant distress):

• Nebulized epinephrine: 0.5 mL/kg of 1:1000 solution (maximum 5 mL) 7, 1
  • Alternative: Racemic epinephrine 2.25% solution: 0.5 mL in 2 mL normal saline 7
• High-flow humidified oxygen if hypoxic 1
• Effect is temporary (1-2 hours), so observation is mandatory 1

Step 3: Observation and Disposition

After Epinephrine Administration:

• Observe for minimum 2-4 hours after last epinephrine dose 1, 8
• Monitor for rebound symptoms as epinephrine effect wears off
• Do NOT discharge immediately after epinephrine - this is a critical safety issue 1

Admission Criteria:

• Stridor at rest after observation period
• Requiring ≥3 doses of nebulized epinephrine 8, 9, 10
• Persistent respiratory distress despite treatment
• Hypoxia requiring supplemental oxygen
• Signs of exhaustion or altered mental status
• Inability to maintain hydration 11

Safe Discharge Criteria:

• No stridor at rest after observation
• Normal or near-normal work of breathing
• Tolerating oral fluids
• Reliable caregivers with access to emergency care
• ≤2 epinephrine doses required 8

Critical Practice Points

Common Pitfalls to Avoid

1. Failing to give corticosteroids for "mild" croup - evidence supports steroids for ALL severities 2, 3, 4
2. Discharging too soon after epinephrine - must observe for rebound (minimum 2 hours) 1
3. Using epinephrine as outpatient treatment - should only be used where observation is possible 1
4. Ordering unnecessary tests - diagnosis is clinical; radiographs and labs rarely helpful 2

When to Consider Alternative Diagnoses

Suspect other conditions if:

• High fever with toxic appearance (consider bacterial tracheitis, epiglottitis)
• Sudden onset without prodrome (consider foreign body aspiration)
• Drooling, inability to swallow, tripod positioning (consider epiglottitis)
• Unilateral symptoms or asymmetric findings 12, 2

Dosing Precision

Epinephrine concentrations require careful attention:

• 1:1000 (1 mg/mL) for nebulization: 0.5 mL/kg up to 5 mL
• 1:10,000 (0.1 mg/mL) for IV use in cardiopulmonary arrest only
• Never confuse these concentrations - using wrong concentration can be fatal 7

Evidence Strength

The recommendation for dexamethasone is supported by multiple randomized controlled trials showing improved symptoms, reduced return visits, and shorter hospitalizations across all severity levels 2, 3. The British Thoracic Society guidelines 1 and American Academy of Pediatrics guidance 7 consistently support this approach, with recent quality improvement data 8 demonstrating that following these guidelines reduces admission rates by over 50% when appropriate observation periods are used.