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Takata, K. et al.

Kazuna Takata, Nobuyuki Amino, Sumihisa Kubota, Ichiro Sasaki, Eijun Nishihara, Takumi Kudo, Mitsuru Ito, Shuji Fukata, Akira Miyauchi,

Benefit of short-term iodide supplementation to antithyroid drug treatment of thyrotoxicosis due to Graves' disease.

OBJECTIVE: Combined treatment with anti-thyroid drugs (ATDs) and potassium iodide (KI) has been used only for severe thyrotoxicosis or as a pretreatment before urgent thyroidectomy in patients with Graves' disease. We compared methimazole (MMI) treatment with MMI + KI treatment in terms of rapid normalization of thyroid hormones during the early phase and examined the later induction of disease remission. DESIGN AND PATIENTS: A total of 134 untreated patients with Graves' disease were randomly assigned to one of four regimens: Group 1, MMI 30 mg; Group 2, MMI 30 mg + KI; Group 3, MMI 15 mg and Group 4, MMI 15 mg + KI. For easy handling, KI tablets were used instead of saturated solution of KI. KI was discontinued when patients showed normal free thyroxine (FT4) levels but MMI was continued with a tapering dosage until remission. Remission rate was examined during a 4- to 5-year observation. MEASUREMENTS: Serum FT4, FT3 and TSH were measured by chemiluminescent immunoassays. TSH receptor antibody (TRAb) was assayed with TRAb-ELISA. Goitre size was estimated by ultrasonography. RESULTS: After 2 weeks of treatment, normal FT4 was observed in 29% of patients in Group 1 and 59% (P < 0.05) of patients in Group 2. Furthermore, normal FT4 after 2 weeks of treatment was observed in 27% of patients in Group 3 and 54% (P < 0.05) of patients in Group 4. Similarly, FT3 normalized more rapidly in Groups 2 and 4 than in Groups 1 and 3. None of the patients showed an increase in thyroid hormones or aggravation of disease during combined treatment with MMI and KI. The remission rates in Groups 1, 2, 3 and 4 were 34%, 44%, 33% and 51%, respectively, and were higher in the groups receiving combined therapy but differences among four groups did not reach significance. CONCLUSIONS: Combined treatment with MMI and KI improved the short-term control of Graves' hyperthyroidism and was not associated with worsening hyperthyroidism or induction of thionamide resistance.[1]

References

Benefit of short-term iodide supplementation to antithyroid drug treatment of thyrotoxicosis due to Graves' disease. Takata, K., Amino, N., Kubota, S., Sasaki, I., Nishihara, E., Kudo, T., Ito, M., Fukata, S., Miyauchi, A. Clin. Endocrinol. (Oxf) (2010) [Pubmed]

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