| Complication | Mechanism | Rate (Expert Surgeon) | Consequence |
|---|
| Recurrent laryngeal nerve (RLN) injury | Transection, traction, thermal, entrapment | Transient 5–10%, Permanent <1% | Hoarseness, breathy voice, aspiration risk (bilateral = airway emergency) |
| Superior laryngeal nerve (SLN) injury | External branch at superior pole | Transient ~5%, Permanent 1–2% | Voice fatigue, pitch loss, inability to project |
| Hypoparathyroidism | Devascularization, removal, autotransplant failure | Transient 10–30%, Permanent 1–3% | Hypocalcemia → tetany, seizures, QT prolongation. Lifelong Ca²⁺/Vit D if permanent. |
| Hemorrhage / Hematoma | Vessel slip, coagulopathy | <1% | Airway compression → emergency re-exploration. |
Minor / Expected
- Neck scar (cosmetic), transient dysphagia, seroma, temporary hypocalcemia (routine post-op Ca²⁺ supplementation).
Risk Modifiers
- Surgeon volume: >30–50 thyroidectomies/yr → significantly lower complications.
- Pathology: Cancer (central neck dissection ↑ RLN risk), large goiter, reoperation, Graves' (vascularity).
- Technology: IONM (nerve monitoring) standard of care; reduces RLN injury.
Patient Counseling Points
- Choose high-volume endocrine surgeon.
- Discuss IONM use.
- Understand calcium protocol (pre-op Vit D, post-op Ca²⁺ taper).
- Voice evaluation pre-op (baseline).
- Know signs of hypocalcemia (numbness, tingling, cramps, Chvostek's/Trousseau's).
Thyroid surgery is safe *when performed by experts*. Volume-outcome relationship is among strongest in surgery.
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