Treatment of Croup in Adults
Adult croup should be managed with systemic corticosteroids (dexamethasone), nebulized racemic epinephrine for moderate-to-severe cases with stridor, and consideration of heliox (helium-oxygen mixture) for immediate symptom relief, with close airway monitoring and low threshold for intervention given the risk of rapid progression to airway obstruction.
Clinical Recognition and Initial Assessment
Adult croup (laryngotracheitis) is a rare but distinct clinical entity that presents similarly to pediatric croup but carries higher risk for rapid airway compromise 1, 2. Key clinical features to identify include:
- Barking cough with preceding upper respiratory infection symptoms 3
- Inspiratory stridor indicating significant airway narrowing 3
- Paradoxical abdominal breathing suggesting increased work of breathing 3
- Subglottic narrowing on anteroposterior neck radiograph (steeple sign) 3, 2
The condition typically follows a viral prodrome (commonly respiratory syncytial virus or parainfluenza) and can progress to critical airway obstruction requiring intervention 1, 3, 2.
Pharmacologic Management
First-Line Therapy: Corticosteroids
Administer systemic corticosteroids (dexamethasone) immediately upon diagnosis 3. Early steroid administration is critical for reducing airway inflammation and preventing progression.
Nebulized Racemic Epinephrine
Use nebulized racemic epinephrine for patients with stridor or respiratory distress 3. This provides rapid but temporary relief of airway edema through vasoconstriction. Monitor patients for at least 2 hours after each dose, as rebound symptoms can occur 4.
Heliox (Helium-Oxygen Mixture)
Consider heliox for immediate symptomatic relief, particularly in patients with significant stridor 3. In documented cases, stridor resolved immediately after initiating heliox therapy, providing a bridge while corticosteroids take effect 3.
Airway Management and Monitoring
Close observation with continuous monitoring is mandatory, as adult croup can progress rapidly to complete airway obstruction 1, 2. Critical management principles include:
- Maintain a low threshold for airway intervention (intubation or surgical airway) 1, 2
- Prompt decision-making regarding airway management is essential for preventing catastrophic outcomes 1
- Approximately 43% of adult croup patients in case series required airway intervention 2
Disposition and Follow-Up
Most patients achieve complete clinical recovery within 72 hours without escalation of care when appropriately managed 3. However, admission should be considered for:
- Patients requiring multiple doses of racemic epinephrine
- Those with persistent stridor despite treatment
- Any signs of impending airway compromise
Confirm resolution with repeat chest radiography showing resolution of subglottic narrowing before discharge 3.
Critical Pitfalls to Avoid
- Do not underestimate the severity based on initial presentation—adults can deteriorate rapidly unlike the more predictable course in children 1, 2
- Do not delay airway intervention if clinical deterioration occurs; adult airways are less forgiving than pediatric airways 1
- Do not discharge patients prematurely—ensure adequate observation period after racemic epinephrine (minimum 2 hours) to detect rebound symptoms 3