A 34-year-old smoker with compressive Graves' goiter, active orbitopathy and a request for radioiodine
A 34-year-old woman with Graves' disease is referred for a surgical opinion. She has a diffusely enlarged goiter that has grown over 8 months; she describes positional dyspnoea at night, hoarseness after long conversations, and a choking sensation when lying flat. CT shows 42% tracheal narrowing at the level of the thoracic inlet. She is on carbimazole 40 mg daily and propranolol 40 mg three times daily, yet FT4 is twice the upper limit of normal, TSH is suppressed, and TRAb is markedly raised. She has active moderate-to-severe orbitopathy with worsening proptosis and diplopia over the past 3 months, and is on no steroid. She smokes 20 cigarettes daily. She is neither clinically nor biochemically euthyroid: resting pulse 104/min, weight down 6 kg, fine tremor. She is anxious about a visible scar and about weight gain after surgery, and asks whether she can have "the radioactive drink instead".
1. Compare total thyroidectomy, radioiodine and continued antithyroid drug therapy for this patient, and justify which you would recommend.
Read the worked answer
Radioiodine is the option she has asked for and the one least suited to her. Three specific objections apply. First, active moderate-to-severe orbitopathy: radioiodine worsens eye disease, particularly in smokers, and she smokes 20 a day. Second, a large goiter with 42% tracheal narrowing and positional dyspnoea: radioiodine can cause transient thyroiditis with gland swelling, worsening compression and, rarely, precipitating airway obstruction. Third, kinetics: it takes 3–6 months to work, with a substantial failure rate in large glands. Pregnancy must be excluded before any radioiodine in a woman of childbearing age.
Continued antithyroid drugs alone: she is biochemically uncontrolled on 40 mg carbimazole, and relapse after withdrawal in Graves' disease exceeds 50%. Drugs neither shrink the goiter nor relieve compression, and she needs definitive control.
Total thyroidectomy removes the compressive gland at once, treats the orbitopathy by removing the antigenic stimulus, and gives definitive control with a low recurrence rate, at the price of lifelong levothyroxine, a 1–2% risk of permanent recurrent laryngeal nerve palsy, and a risk of permanent hypoparathyroidism. The scar and the weight question must be answered honestly - hypothyroidism is managed, and treated hypothyroidism does not cause inexorable weight gain.
Recommendation: total thyroidectomy after proper euthyroid preparation, with preoperative vocal cord check and a documented airway plan, by a high-volume surgeon.
2. Write the preoperative preparation plan with agents, doses and timing, and state what you will use to judge that she is ready for theatre.
Read the worked answer
- Continue carbimazole 40 mg daily, or switch to propylthiouracil 200 mg three times daily if intolerant. The aim is a biochemically euthyroid state before iodine is added; iodine given to a thyrotoxic gland is used as substrate.
- Propranolol 40–80 mg three times daily (or 80–160 mg modified release), titrated to a resting pulse below 80–90/min. It controls tremor, anxiety and tachycardia and reduces peripheral conversion of T4 to T3, but it is not a substitute for antithyroid control.
- Once FT4 and FT3 are normal, add potassium iodide (Lugol's iodine 0.2–0.6 mL three times daily, or 100–200 mg iodide daily) for 7–10 days preoperatively. This exploits the Wolff–Chaikoff escape phenomenon to reduce gland vascularity and hormone release, giving a drier dissection and lowering storm risk.
- Consider prednisolone 30–40 mg daily for rapid control and for the orbitopathy, and cholestyramine 4 g four times daily as an adjunct to lower circulating hormone if rapid control is needed.
- Optimise everything else: smoking cessation, chest physiotherapy, anaesthetic review of the narrowed trachea, vocal cord check, and consent covering nerve and parathyroid risk.
Readiness is judged on FT4 and FT3 within the reference range, resting pulse below 90/min, absence of tremor and heat intolerance, and stable weight - not on TSH, which stays suppressed for months because of TRAb. If she is still toxic after 4–6 weeks, postpone rather than operate, and consider plasmapheresis only in extreme circumstances.
3. Six hours after total thyroidectomy she has inspiratory stridor and a tense, swollen neck. Give your actions in order and the alternative diagnoses you must consider.
Read the worked answer
Treat this as an expanding cervical haematoma until proved otherwise.
- Stay with the patient. Call the most senior surgeon and anaesthetist immediately; ask for a difficult-airway trolley, a tracheostomy set and a second pair of hands.
- Open the wound at the bedside: remove clips, open skin, platysma and strap muscles, and evacuate the clot with a finger or sucker. This decompresses the trachea and is often the single life-saving act; a competent nurse or junior doctor can be authorised to do it if you are not there.
- High-flow oxygen, and prepare for re-intubation with a surgeon scrubbed and ready for emergency tracheostomy if intubation fails.
- Once the airway is secure, take her to theatre for formal re-exploration and haemostasis; cross-match and correct coagulopathy.
Alternatives to consider in parallel. Laryngeal oedema causes stridor without neck swelling, often after difficult intubation - nebulised adrenaline, steroids, and early intubation. Bilateral recurrent laryngeal nerve palsy causes stridor immediately on extubation with a normal neck; confirm by laryngoscopy, and it may need tracheostomy. Tracheomalacia from long-standing compression gives a soft trachea that collapses on inspiration; it responds to positive-pressure ventilation or a period of intubation. Hypocalcaemia at 24–72 hours gives perioral tingling, carpopedal spasm and Chvostek's sign, and can cause stridor but never a swollen neck.
Do not send her for a CT scan. The diagnosis is clinical and the airway is the clock.