radio-iodine or surgical treatment in thyrotoxicosis

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Indications for radioiodine treatment include:

  • radio-iodine treatment
    • can be used as the first-line treatment for adults with Graves' disease, toxic adenoma, and toxic multinodular goitre.
      • should be considered as the preferred treatment for those
        • with severe Graves’ disease, especially young patients aged less than 40 years, men, and those with a large goitre
        • who are unlikely to achieve long term remission with antithyroid drugs
    • early use of radioiodine has been shown to be the cheapest long term strategy in managing Graves’ disease
    • a pragmatic fixed dose that results in euthryoidism or hypothyroidism in 70-90% of patients is recommended
      • treatment with optimal individual dose of radioiodine does not improve outcome
      • doses of 370 to 550 MBq for routine use in Graves’ disease is used in the UK (large goitres may need higher doses)
    • regular thyroid function tests should be carried out to detect radioiodine induced hypothyroidism early
    • release of preformed hormone may lead exacerbation of thyrotoxicosis (or even a thyroid storm being precipitated)
      • pre-treatment with thionamides (until euthyroid) is recommended to reduce the risk in patients with large goitres, severe thyrotoxicosis, ischaemic heart disease, heart failure, or arrhythmia 
    • optimal outcome from radioiodine can be obtained by stopping methimazole or carbimazole at least a week before radioiodine therapy
      • if propylthiouracil is used, it should be stopped at least two weeks before radioiodine 
    • absolute contraindications include:
      • pregnancy
      • breastfeeding
      • planning pregnancy
      • inability to comply with radiation safety recommendations
    • if biopsy of thyroid nodules indicates or are suspicious for cancer, radioiodine treatment is contraindicated
    • women of child-bearing age are advised to avoid pregnancy for six months after receiving radio-iodine treatment
    • the presence of Graves' ophthalmopathy is a relative contra-indication to radio-iodine therapy because it may deteriorate after radio-iodine treatment (1,2)

Thyroidectomy is the most effective and predictable treatment for Graves’ disease

  • total thyroidectomy is preferred over subtotal thyroidectomy since the frequency of successful outcomes are significantly higher in the former with no differences in the rate of complications
  • especially recommended for the following patients:
    • large goitres (cosmetically undesirable) or low uptake of radioactive iodine (or both)
    • suspected or documented thyroid cancer
    • moderate-to-severe ophthalmopathy, for which radioactive iodine therapy is contraindicated
    • a preference for surgery
  • patients need to be rendered euthyroid before surgery
    • if thionamide antithyroid drugs cannot be used, treatment with iodine loading with potassium iodide, Lugol’s iodine, or oral cholecystographic contrast media (iopanoic acid 1 g daily) for 5-10 days will result in euthyroidism in almost all cases (1,2)

Reference:

Last edited 04/2018

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