Σφακιανάκης Αλέξανδρος
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Πέμπτη 21 Ιανουαρίου 2021

Increased Risk of Radioiodine Treatment Failure Associated with Graves Disease Refractory to Methimazole.

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Increased Risk of Radioiodine Treatment Failure Associated with Graves Disease Refractory to Methimazole.

Endocr Pract. 2020 Nov;26(11):1312-1319

Authors: Kwak JJ, Altoos R, Jensen A, Altoos B, McDermott MT

Abstract
OBJECTIVE: Iodine 131 (I-131) radioactive iodine (RAI) therapy has been the preferred treatment for Graves disease in the United States; however, trends show a shift toward antithyroid drug (ATD) therapy as first-line therapy. Consequently, this would favor RAI as second-line therapy, presumably for ATD refractory disease. Outcomes of RAI treatment after first-line ATD therapy are unclear. The purpose of this study was to investigate treatment failure rates and potential risk factors for treatment failure, including ATD use prior to RAI treatment.
METHODS: A retrospective case control study of Graves disease patients (n = 200) after I-131 RAI therapy was conducted. Treatment failure was defined as recurrence or persistence of hyperthyroidism in the follow-up time after therapy (mean 2.3 years). Multivariable regression models were used to evaluate potential risk factors associated with treatment failure.
RESULTS: RAI treatment failure rate was 16.5%. A majority of patients (70.5%) used ATD prior to RAI therapy, predominantly methimazole (MMI) (91.9%), and approximately two-thirds of patients used MMI for >3 months prior to RAI therapy. Use of ATD prior to RAI therapy (P = .003) and higher 6-hour I-123 thyroid uptake prior to I-131 RAI therapy (P<.001) were associated with treatment failure. MMI use >3 months was also associated with treatment failure (P = .002).
CONCLUSION: More patients may be presenting for RAI therapy after failing first-line ATD therapy. MMI use >3 months was associated with RAI treatment failure. Further studies are needed to investigate the association between long-term first-line ATD use and RAI treatment failure.

PMID: 33471662 [PubMed - as supplied by publisher]

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