A 52-year-old woman undergoes total thyroidectomy for papillary thyroid carcinoma. Intraoperatively, the surgeon identifies the recurrent laryngeal nerve (RLN) and carefully preserves it. However, postoperatively, the patient develops hoarseness and difficulty with phonation. What is the most appropriate immediate next step in management?

Explanation

## Assessment of Postoperative Vocal Cord Dysfunction **Key Point:** Hoarseness immediately after thyroidectomy warrants urgent laryngoscopic evaluation to determine the anatomical basis of vocal cord dysfunction and guide further management. ### Why Immediate Laryngoscopy is Essential 1. **Differential diagnosis of RLN injury** - Temporary neuropraxia (edema, traction) - Complete transection - Partial injury - Vocal cord position (paramedian vs. lateral) 2. **Clinical decision-making** - Paramedian position → suggests neuropraxia; conservative management - Lateral position → suggests complete transection; may need surgical re-exploration or later reinnervation - Bilateral RLN injury → airway emergency requiring tracheostomy **High-Yield:** The vocal cord position on laryngoscopy determines prognosis and treatment pathway. A paramedian cord typically recovers within 3–6 months; a lateral cord suggests permanent injury. ### Management Algorithm ```mermaid flowchart TD A[Postoperative hoarseness after thyroidectomy]:::outcome --> B[Immediate laryngoscopy]:::action B --> C{Vocal cord position?}:::decision C -->|Paramedian| D[Neuropraxia - observe 3-6 months]:::action C -->|Lateral| E[Likely complete RLN transection]:::outcome E --> F[Consider re-exploration if within 72 hours]:::action E --> G[Plan voice therapy and reinnervation procedures]:::action C -->|Bilateral lateral| H[Airway emergency - tracheostomy]:::urgent ``` **Clinical Pearl:** The RLN has a long, vulnerable course in the neck. It loops under the aortic arch on the left and subclavian artery on the right, making it susceptible to traction and thermal injury during thyroidectomy. **Mnemonic — RLN Anatomy (Left vs Right):** **LARS** — Left Aortic, Right Subclavian. The left RLN loops under the aortic arch; the right loops under the right subclavian artery. ### Why Other Options Are Suboptimal - **Reassurance alone:** Delays diagnosis of potentially reversible injury and misses bilateral involvement (airway risk). - **Empirical corticosteroids:** May help with edema but does not identify the anatomical problem; not evidence-based for RLN injury. - **Voice therapy without investigation:** Premature; therapy is appropriate *after* laryngoscopy confirms the type of injury.