🫁 Nebulized Epinephrine for Severe Croup Simulator

Stridor at Rest Marks Severe Croup

Stridor without agitation signals severe upper-airway narrowing.

• At rest: Severity marker (stridor present without crying)
• Subglottic edema: Cause (viral laryngotracheobronchitis)
• Nebulized epi: Action (plus systemic steroid)
• Monitored ED: Setting (close observation required)

Recognizing severe croup

Placeholder: stridor at rest plus retractions indicates severe airway obstruction.

Nebulized Epinephrine Delivery

Aerosol mist carries epinephrine directly onto airway mucosa.

• Nebulized: Route (face mask aerosol)
• ~10 min: Onset (rapid topical action)
• Racemic/L-epi: Drug (alpha and beta agonist)
• As needed: Dose repeat (per protocol, monitored)

Delivery mechanics

Placeholder: mist particles deposit epinephrine onto inflamed subglottic mucosa.

Rapid Mucosal Vasoconstriction

Alpha-adrenergic action shrinks swollen vessel walls quickly.

• Alpha-1 agonism: Mechanism (vascular smooth muscle)
• Reduced edema: Effect (mucosal fluid shift out)
• Minutes: Speed (fast topical response)
• ~2 hr: Duration (effect gradually fades)

Vessel-level effect

Placeholder: constricted capillaries reduce mucosal fluid leakage and swelling.

Temporary Airway Widening

Lumen widens as swelling drops, peaking near thirty minutes.

• ~30 min: Peak time (maximal lumen widening)
• Stridor eases: Symptom change (improved air entry)
• ~1–2 hr: Duration (temporary, not curative)
• Not a cure: Caution (underlying edema persists)

Peak widening window

Placeholder: airway diameter improves temporarily while drug effect lasts.

Rebound Edema — Observation Period

Swelling can return once epinephrine effect wears off.

• 2–4 hr: Risk window (after nebulization)
• Min. 3–4 hr: Observation (monitored stay recommended)
• Reassess stridor: Action (may repeat dose or admit)
• If stable: Discharge (no stridor at rest, no retraction)

Why observation matters

Placeholder: rebound edema can recur without lasting steroid coverage.

Placeholder: always observe for rebound before discharge.