A 35-year-old woman is admitted to the burn unit 4 hours after sustaining a thermal injury to her face, neck, and bilateral upper limbs from a kitchen fire. Examination reveals: blistering erythema with blanching on the face and neck; deep red, leathery, non-blanching skin with eschar on both forearms; singed nasal hairs; and hoarseness of voice. Estimated TBSA is 28%. What is the depth of burn on the forearms, and what is the priority intervention for the airway?

Explanation

## Burn Depth Classification and Airway Management ### Burn Depth Assessment | Depth | Appearance | Sensation | Blanching | Healing | Scarring | |-------|-----------|-----------|-----------|---------|----------| | **Superficial (1°)** | Red, dry | Painful | Yes | 3–7 days | None | | **Superficial partial (2°)** | Blistered, moist, red | Very painful | Yes | 1–3 weeks | Minimal | | **Deep partial (3°)** | Leathery, red/brown, moist initially | Hypoesthetic | **No** | >3 weeks, grafting needed | Significant | | **Full-thickness (4°)** | Charred, black, dry, hard | Anesthetic | No | Requires grafting | Severe | **Key Point:** The forearms show **deep red, leathery, non-blanching skin with eschar** — these are hallmarks of **deep partial-thickness (3rd degree) burns**, not full-thickness. Full-thickness burns are charred and black, not red. ### Clinical Features of Deep Partial-Thickness Burn 1. **Appearance:** Leathery, waxy, red or brown 2. **Blanching test:** **Does NOT blanch** (distinguishes from superficial partial) 3. **Sensation:** Hypoesthetic (some pain sensation remains, unlike full-thickness) 4. **Healing:** Requires skin grafting; high scarring risk ### Airway Involvement — Red Flags **High-Yield:** This patient has **inhalation injury** indicators: - Singed nasal hairs - Hoarseness of voice - Burns to face and neck (risk of airway edema) - Enclosed space injury (kitchen fire) **Mnemonic:** **SOOT = Signs Of Ongoing Threat** to airway - **S**inged nasal hairs - **O**ral/pharyngeal erythema - **O**dor of smoke - **T**hermal injury to oropharynx ### Immediate Airway Management ```mermaid flowchart TD A[Burn patient with inhalation injury signs]:::outcome --> B{Respiratory distress or stridor?}:::decision B -->|Yes| C[Immediate endotracheal intubation]:::urgent B -->|No| D{Signs of airway involvement?}:::decision D -->|Singed hairs, hoarseness| E[Early intubation before edema]:::action D -->|No signs| F[Monitor closely, prepare for intubation]:::action C --> G[Secure airway within 6-12 hours]:::action E --> G F --> H{Deterioration?}:::decision H -->|Yes| C H -->|No| I[Continue supportive care]:::action ``` **Clinical Pearl:** In burn patients with inhalation injury, **early intubation (within 6–12 hours) is preferred** over waiting for signs of respiratory distress. Airway edema develops rapidly and can make intubation difficult or impossible. **Why endotracheal intubation (not cricothyrotomy or tracheostomy)?** - **Endotracheal tube:** First-line, reversible, allows suctioning of carbonaceous debris - **Cricothyrotomy:** Emergency surgical airway only if ETT placement fails - **Tracheostomy:** Delayed procedure (24–48 hrs), not for acute airway emergency ### Why Not the Other Options? - **Option 1 (Superficial partial-thickness):** The non-blanching, leathery appearance indicates deep partial, not superficial partial (which blanches) - **Option 2 (Cricothyrotomy):** Cricothyrotomy is a surgical emergency airway for failed intubation or when intubation is impossible; it is not the priority intervention when endotracheal intubation is feasible - **Option 3 (Full-thickness/4th degree):** Full-thickness burns are charred and black, not red and leathery. The description fits deep partial-thickness (3rd degree)