A 5-year-old boy is brought to the ENT OT with a suspected peanut foreign body in the left main bronchus, confirmed on rigid bronchoscopy. During the procedure, the child develops laryngeal edema and stridor. What is the drug of choice to reduce airway edema and prevent post-extubation croup?

Explanation

## Corticosteroid Management of Laryngeal Edema in Foreign Body Removal ### Why Dexamethasone is the Drug of Choice **Key Point:** Dexamethasone is the preferred corticosteroid for acute laryngeal edema in pediatric airway emergencies because of its long half-life, potency, and superior anti-inflammatory effect with minimal mineralocorticoid activity. **High-Yield:** In foreign body airway procedures, intraoperative laryngeal edema is common. Dexamethasone given intraoperatively reduces post-extubation stridor and croup by 60–80% in pediatric patients. ### Comparative Pharmacology of Corticosteroids | Agent | Potency | Half-life | Onset | Mineralocorticoid Activity | Pediatric Use | |-------|---------|-----------|-------|---------------------------|---------------| | **Dexamethasone** | 25–30× | 36–72 hrs | 1–2 hrs | Minimal | Gold standard | | **Hydrocortisone** | 1× | 8–12 hrs | Rapid | Moderate | Second-line | | **Methylprednisolone** | 5× | 12–36 hrs | 1–2 hrs | Minimal | Alternative | | **Prednisolone** | 4× | 12–36 hrs | 1–2 hrs | Minimal | Oral alternative | **Clinical Pearl:** Dexamethasone's long half-life (36–72 hours) ensures sustained anti-inflammatory coverage through the critical post-extubation period when laryngeal edema typically peaks (4–6 hours post-extubation). ### Dosing for Pediatric Laryngeal Edema **Intraoperative/Emergency dosing:** - **IV dexamethasone:** 0.5–1 mg/kg (max 10 mg) IV or IM - Can repeat at 6-hour intervals if needed - Onset: 1–2 hours **Mnemonic:** **DEXA-LONG** — Dexamethasone Extended Action for Laryngeal Obstruction Needs Glucocorticoid ### Why Dexamethasone > Hydrocortisone 1. **Longer half-life** → sustained coverage through post-extubation period 2. **Higher potency** → more effective anti-inflammatory at lower doses 3. **Minimal mineralocorticoid effect** → no sodium retention or hypokalemia risk 4. **Single-dose efficacy** → one dose often sufficient; hydrocortisone requires 4–6 hourly dosing **Tip:** Administer dexamethasone intraoperatively (not just post-extubation) for maximum benefit. The edema-reducing effect takes 1–2 hours, so early administration is critical.