A 42-year-old woman underwent total thyroidectomy 2 days ago for papillary thyroid carcinoma. She now presents with bilateral vocal cord paralysis and stridor. Oxygen saturation is 92% on room air. What is the most appropriate immediate action?

Explanation

## Critical Airway Emergency Bilateral vocal cord paralysis (BVCP) with stridor and hypoxia is a surgical emergency requiring immediate airway management. ### Why Emergency Tracheostomy is Indicated **Key Point:** Bilateral vocal cord paralysis causes severe airway obstruction because both cords are immobile in a paramedian or median position, leaving only a narrow airway. Stridor and hypoxia indicate impending airway loss. **High-Yield:** Post-thyroidectomy BVCP is a known complication (incidence ~1–2%) due to bilateral RLN injury. Unlike unilateral paralysis (which causes voice loss), bilateral paralysis causes airway obstruction and is a medical emergency. **Mnemonic: BVCP Airway Risk** — **B**ilateral = **B**ad airway, **V**ocal = **V**ery urgent, **C**ords = **C**ritical, **P**aralysis = **P**rocedure needed now. ### Pathophysiology of Post-Thyroidectomy BVCP 1. Bilateral RLN injury during thyroid dissection or retraction 2. Both vocal cords assume paramedian position (most common) or median position 3. Airway lumen narrows dramatically → stridor 4. Hypoxia develops as obstruction worsens 5. Tracheostomy bypasses the obstruction and secures the airway ### Management Algorithm for BVCP ```mermaid flowchart TD A[Bilateral Vocal Cord Paralysis]:::outcome --> B{Stridor + Hypoxia?}:::decision B -->|Yes| C[EMERGENCY: Secure airway]:::urgent C --> D[Tracheostomy under local anesthesia]:::action B -->|No, asymptomatic| E[Observe, consider imaging]:::action D --> F[Postoperative imaging: CT neck]:::action F --> G{Cause identified?}:::decision G -->|Hematoma| H[Evacuation if expanding]:::action G -->|Bilateral RLN injury| I[Voice therapy, consider future vocal cord surgery]:::action ``` ### Why Each Option Fails | Option | Rationale for Rejection | |--------|------------------------| | **Dexamethasone + observation** | Steroids do NOT reverse vocal cord paralysis and waste critical time. Stridor + hypoxia demand immediate airway intervention, not observation. | | **CT neck** | While CT may identify hematoma, it delays definitive airway management. In an emergency, imaging is secondary to airway security. | | **Antibiotics + monitoring** | Infection is not the primary problem here. Monitoring a patient with stridor and hypoxia risks complete airway loss and cardiac arrest. | **Warning:** Do NOT delay tracheostomy for imaging or medical therapy in a patient with BVCP and stridor. Airway obstruction can progress rapidly and become fatal. **Clinical Pearl:** Tracheostomy under local anesthesia (rather than general anesthesia) is preferred in BVCP because general anesthesia can precipitate complete airway loss when the endotracheal tube is withdrawn. [cite:Robbins & Cotran 10e Ch 16; Harrison 21e Ch 30]