Abstract
The success rate of radioiodine (I-131) therapy for toxic goiter and solitary hyperfunctioning nodules depends on thyroid volume, compensation of hyperthyroidism, timing of the withdrawal of antithyroid drugs, alimentary iodine intake, and the dose concepts in the different thyroid diseases. The aim of treatment with I-131 is to achieve a non-hyperthyroid status, which can be euthyroid or hypothyroid, recompensated by levothyroxine medication. Studies with an intended dose of about 120 Gy to the toxic multinodular goiter reported a success rate of more than 90%. The successful elimination of hyperfunctioning nodules occurred in 90% of patients receiving 300 Gy to the nodule volume and in 94% of patients receiving 400 Gy to the nodule volume. There is an emerging role for I-131 in the treatment for so-called subclinical hyperthyroidism.
The success of I-131 treatment in reducing the size of nontoxic goiters depends on the applied I-131 activities per gram thyroid tissue and the distribution of I-131 within the goiter. Disadvantageous are large cystic and fibrotic areas. Most of the shrinkage occurs within the first year, and goiter volumes are decreasing continuously for several years to about 30% of the initial size. With more effective strategies for goiter shrinkage—including the additive use of modified recombinant human thyrotropin in clinical trials—more patients will require levothyroxine medication. Radioiodine therapy for reducing the goiter size can be recommended especially for elderly people, for those with comorbidity and for patients who want to avoid surgery.
Radioiodine therapy due to Graves’ disease is recommended for patients with persistence of Graves’ thyrotoxicosis after 12–24 months of antithyroid drugs or relapse of thyrotoxicosis. In a subgroup of patients with an initially high risk of recurrent thyrotoxicosis (young patients, thyroid volume of >40 mL, TSH-receptor antibodies >10 IU/L after 6 months of antithyroid drugs), radioiodine therapy should be discussed as first-line treatment. For the elimination of Graves’ thyrotoxicosis, an ablative concept is preferred (intended dose of 300 Gy) with the aim of replacing thyroid hormone by levothyroxine medication.
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Abbreviations
- Ab:
-
Antibody
- ATD:
-
Antithyroid drug
- FNAB:
-
Fine needle aspiration biopsy
- fT4:
-
Free levothyroxine in serum
- fT3:
-
Free triiodothyronine in serum
- I-131:
-
Iodine-131 (radioiodine)
- LT4:
-
Levothyroxine medication
- mrhTSH:
-
Modified recombinant human TSH
- PTU:
-
Propylthiouracil
- rhTSH:
-
Recombinant human TSH
- SD:
-
Standard deviation
- Tg:
-
Thyroglobulin
- TPO:
-
Thyroidal peroxidase
- Xe-131:
-
Xenon-131
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Dietlein, M. (2020). Radioiodine Therapy for Benign Thyroid Disease. In: Ahmadzadehfar, H., Biersack, HJ., Freeman, L., Zuckier, L. (eds) Clinical Nuclear Medicine. Springer, Cham. https://doi.org/10.1007/978-3-030-39457-8_28
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