Endocrine surgery complications

⚠️ The Risky Trio

• Nerve Injury:
  • Recurrent Laryngeal (RLN): Unilateral injury → hoarseness. Bilateral → inspiratory stridor, airway emergency.
  • Superior Laryngeal (SLN): External branch injury → loss of high-pitched voice, vocal fatigue.
• Hypoparathyroidism:
  • Inadvertent removal/devascularization of parathyroid glands → ↓PTH → Hypocalcemia.

⭐ Hypocalcemia: Presents with perioral numbness and tingling (paresthesias). Elicit Chvostek (facial twitch) and Trousseau (carpal spasm) signs. Severe cases can cause tetany and seizures.

🤕 Complications - Gland-Specific Grief

Thyroidectomy

• Hypocalcemia: Most common complication. Due to parathyroid devascularization or inadvertent removal.
  • Symptoms: Perioral numbness, paresthesias, muscle cramps.
  • Signs: Chvostek (facial twitch), Trousseau (carpal spasm with BP cuff).
• Nerve Injury:

  Nerve	Injury Manifestation
  Recurrent Laryngeal (RLN)	Unilateral: Hoarseness, breathy voice. Bilateral: Acute airway obstruction (stridor).
  Superior Laryngeal (SLN)	Loss of high-pitched voice; vocal fatigue. Often subtle.

• Hematoma: Expanding neck mass can cause rapid airway compromise. A surgical emergency.

Parathyroidectomy

• Hypocalcemia: Can be severe and prolonged ("Hungry Bone Syndrome") in patients with severe pre-op bone disease (e.g., osteitis fibrosa cystica).
• Persistent/Recurrent Hyperparathyroidism: Due to missed adenoma, ectopic gland, or parathyroid hyperplasia.

Adrenalectomy

• Adrenal Insufficiency/Crisis: Requires vigilant post-op steroid replacement, especially after bilateral removal or for Cushing's syndrome.
• Hypertensive Crisis: During manipulation of a pheochromocytoma; requires pre-op alpha-blockade.

⭐ Pearl: Transient hypocalcemia is the most common complication following total thyroidectomy, occurring more frequently than permanent nerve injury.

Post-Thyroidectomy Hypocalcemia Management

🩺 Diagnosis - Finding the Fault

• Hypocalcemia:

  • Labs: ↓ Ionized Calcium, ↓ PTH, ↑ Phosphate.
  • Signs: Positive Chvostek's (facial twitch) & Trousseau's (carpal spasm).
  • ECG: Prolonged QT interval.

• Nerve Injury:

  • Recurrent Laryngeal (RLN): Laryngoscopy shows vocal cord paralysis. Unilateral → hoarseness. Bilateral → stridor, airway emergency.
  • Superior Laryngeal (SLN): Laryngoscopy/stroboscopy reveals vocal cord bowing/asymmetry. Patient reports loss of high pitch.

• Neck Hematoma:

  • Primarily a clinical diagnosis: rapid neck swelling, dyspnea, stridor.
  • Ultrasound can confirm fluid collection.

⭐ Post-thyroidectomy, a precipitous drop in PTH within 1-6 hours of surgery is highly predictive of symptomatic hypocalcemia.

• Hypothyroidism:
  • Labs: ↑ TSH, ↓ Free T4.

🚑 Management - The Rescue Mission

• Post-Op Stridor/Airway Compromise: Immediate action required.

• Hypocalcemia ($Ca^{2+} < 8.5$ mg/dL):

  • Symptomatic (tetany, seizures, QT prolongation): IV Calcium Gluconate.
  • Asymptomatic/Mild: Oral Calcium Carbonate + Calcitriol (active Vit D).

• Thyroid Storm:

  • 📌 4 P's: Propranolol (β-blocker), Propylthiouracil (PTU), Prednisone (corticosteroids), Potassium Iodide (SSKI).

⭐ High-Yield: For a tense, expanding neck hematoma, the immediate life-saving step is opening the surgical incision at the bedside to decompress the airway. Do not delay for OR transport.

⚡ Biggest Takeaways

• Thyroidectomy: Hypocalcemia (parathyroid injury) is most common. Recurrent laryngeal nerve injury causes hoarseness; bilateral is an airway emergency.
• Superior laryngeal nerve injury causes loss of high-pitched voice.
• Parathyroidectomy: Watch for hungry bone syndrome (severe hypocalcemia) and persistent hyperparathyroidism (missed adenoma).
• Pheochromocytoma resection: Risk of intraoperative hypertensive crisis; requires pre-op alpha-blockade.
• Adrenalectomy for Cushing's: Post-op adrenal insufficiency is common; requires steroid replacement.