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- W4304208082 abstract "Background. The long-term continuation of the low-dose antithyroid drug (ATD) beyond the standard duration of ATD therapy of 12–18 months to prevent recurrent hyperthyroidism (RH) is recommended with low quality of evidence. Objectives. To examine whether long-term continuation of low-dose ATD beyond the recommended duration of treatment would provide a benefit in the prevention of RH in patients with Graves’ hyperthyroidism (GH) who achieved euthyroid status with a standard course of ATD therapy. Methods. A 36-month prospective randomized controlled study was conducted in 184 patients who had first diagnosed GH and were treated with a standard regimen of ATD therapy using methimazole (MMI) until achieving euthyroidism that was stably maintained for at least 6 months with a low-dose of (2.5–5 mg/day) MMI. All patients had neither a history of adverse effects from MMI, recurrent GH, severe and active ophthalmopathy nor conditions known to affect thyroid function before randomization. The patients were randomized into 2 groups: one group (92 cases) was assigned to discontinue (DISCONT-MMI) and the other (92 cases) was assigned to continue low-dose MMI (CONT-MMI) that was taken at the time of enrollment. The patients in both groups were followed up at 3, 6, 12, 18, 24, 30, and 36 months. The rate of RH was compared between both groups, and the adverse effects and risk factors of RH were also studied. Results. At the end of the 36-month study, 83 cases in CONT-MMI and 90 cases in DISCONT-MMI were eligible for analysis. The cumulative rates of RH in CONT-MMI were significantly lower than those in DISCONT-MMI at every follow-up time point (1.2% vs. 11.2%, 6.8% vs. 18.4%, 11.0% vs. 27.2%, 11.0% vs. 35.0%, and 11.0% vs. 41.2% at 6, 12, 18, 24, and 36 months, respectively; <math xmlns=http://www.w3.org/1998/Math/MathML id=M1> <mi>p</mi> <mo><</mo> <mn>0.01</mn> </math> ). Cox proportional hazard multivariate analysis showed that there were 2 factors independently associated with the risk of RH, including continuation of low-dose MMI therapy, which decreased the risk of RH by 3.8 times (HR = 0.26, <math xmlns=http://www.w3.org/1998/Math/MathML id=M2> <mi>p</mi> <mo>=</mo> <mn>0.007</mn> </math> , 95% CI = 0.10–0.70) and age onset of hyperthyroidism before 40 years, which increased the risk of RH by 2.9 times (HR = 2.9, <math xmlns=http://www.w3.org/1998/Math/MathML id=M3> <mi>p</mi> <mo>=</mo> <mn>0.015</mn> </math> , 95% CI = 1.23–6.88). Neither minor nor major adverse effects of low-dose MMI therapy were observed during the study period. Conclusions. In Graves’ hyperthyroid patients with no or nonsevere ophthalmopathy who have completed a standard course of methimazole therapy without an adverse effect and have achieved an euthyroid status that is stably maintained with low-dose methimazole, a long-term continuation of the low-dose methimazole of 2.5–5 mg daily is effective and safe in the prevention of recurrent hyperthyroidism or maintenance of euthyroid status as long as the low-dose methimazole is continued. (TCTR20170705002)." @default.
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- W4304208082 date "2022-10-11" @default.
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- W4304208082 title "Benefits of Long-Term Continuation of Low-Dose Methimazole Therapy in the Prevention of Recurrent Hyperthyroidism in Graves’ Hyperthyroid Patients: A Randomized Prospective Controlled Study" @default.
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- W4304208082 doi "https://doi.org/10.1155/2022/1705740" @default.
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