A 55-year-old woman undergoes total thyroidectomy for papillary thyroid carcinoma. On postoperative day 2, she develops bilateral hoarseness and stridor at rest. Flexible laryngoscopy shows both vocal cords in a paramedian position with minimal abduction on inspiration. Her oxygen saturation is 94% on room air, and she has audible inspiratory stridor. What is the most appropriate immediate management?

Explanation

## Bilateral Recurrent Laryngeal Nerve Palsy: Airway Emergency **Key Point:** Bilateral RLN palsy with stridor and hypoxia is an airway emergency requiring immediate tracheostomy. Do NOT delay with observation or medical management alone. ### Pathophysiology of Bilateral RLN Palsy **High-Yield:** When both RLNs are paralyzed: - Both posterior cricoarytenoids (abductors) are non-functional - Both vocal cords rest in paramedian position - The airway is severely compromised (narrowed to ~30% of normal) - Stridor and hypoxia develop acutely ### Clinical Severity Assessment | Feature | Unilateral RLN Palsy | Bilateral RLN Palsy | |---------|----------------------|---------------------| | Airway threat | None | SEVERE | | Stridor | Absent | Present (inspiratory) | | Dyspnea at rest | No | Yes | | Voice quality | Hoarse | Breathy | | Management | Conservative (observation) | Urgent airway intervention | ### Why Immediate Tracheostomy Is Correct 1. **Stridor + hypoxia (SpO₂ 94%)** — Indicates significant airway obstruction 2. **Bilateral paramedian cords** — Cannot be managed medically; the airway is mechanically obstructed 3. **Acute onset (POD 2)** — Suggests iatrogenic bilateral RLN injury during thyroidectomy (both recurrent nerves at risk during central neck dissection) 4. **Tracheostomy bypasses the larynx** — Immediately restores adequate airway and oxygenation **Clinical Pearl:** Bilateral RLN palsy is a rare but catastrophic complication of bilateral neck surgery. The incidence is ~0.5–1% after total thyroidectomy with central neck dissection. ### Why Other Options Are Wrong **Observation alone:** Dangerous. Unlike unilateral RLN palsy (which may recover spontaneously), bilateral palsy will NOT improve acutely. Waiting risks complete airway obstruction and respiratory arrest. **Vocal cord injection:** Useful for unilateral palsy to improve voice and glottic closure, but does NOT address the mechanical airway obstruction in bilateral disease. Injection would narrow the airway further. **Corticosteroids:** No evidence for benefit in RLN palsy. Swelling is not the primary problem; it is paralysis and cord position. Steroids delay definitive airway management. ### Post-Tracheostomy Management 1. Secure airway immediately 2. Investigate cause: review surgical records, imaging for nerve injury 3. Electromyography (EMG) at 3–4 weeks to assess nerve recovery potential 4. If recovery occurs (EMG shows reinnervation), plan decannulation 5. If no recovery by 6–12 months, consider: - Bilateral vocal cord lateralization (arytenoidectomy or cordotomy) - Reinnervation procedures - Decannulation with acceptable voice compromise **Mnemonic:** **AIRWAY FIRST** — In bilateral RLN palsy with stridor, secure the airway (tracheostomy) before considering voice rehabilitation.