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  • Title: Predictive factors of failure in a fixed 15 mCi 131I-iodide therapy for Graves' disease.
    Author: Moura-Neto A, Mosci C, Santos AO, Amorim BJ, de Lima MC, Etchebehere EC, Tambascia MA, Ramos CD, Zantut-Wittmann DE.
    Journal: Clin Nucl Med; 2012 Jun; 37(6):550-4. PubMed ID: 22614185.
    Abstract:
    PURPOSE: To investigate the factors influencing the success rate in a fixed, 15 mCi approach for treatment of Graves' hyperthyroidism. MATERIAL AND METHODS: The thyroid function outcome (hyperthyroidism or euthyroidism/hypothyroidism) was verified at least 1 year after radioiodine therapy (RIT) retrospectively and compared with presenting clinical characteristics and pre-RIT parameters in 87 patients treated with I-iodide for Graves' disease in a tertiary care center. RESULTS: After RIT, 16 patients (18.4%) became euthyroid, 54 patients (62.1%) became hypothyroid, and 17 (19.5%) remained hyperthyroid. We found no statistically significant association between thyroid function outcome and gender (P = 0.50), ophthalmopathy (P = 0.69), drug used (methimazole or propylthiouracil; P = 1.00), maintenance or withdrawal of thionamides pre-RIT (P = 0.98), or 99mTc sodium pertechnetate thyroid uptake prior to RIT (P = 0.75). The only variable associated with the success rate was thyroid mass <62 g (P < 0.001). CONCLUSIONS: Our study has shown that a fixed 15 mCi approach for treatment of Graves' disease was effective, but high failure rates were observed in patients presenting larger goiters, particularly those with estimated thyroid mass >62 g.
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