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This study scrutinizes the correlation between serum free triiodothyronine (FT3) to free thyroxine (FT4) ratios and the eventual outcome of antithyroid drug (ATD) therapy in patients with Graves' disease. Forty-four patients with Graves' thyrotoxicosis were treated with methylmercaptoimidazole (methimazole). During the follow-up, 16 patients relapsed in the short period of one to five months after cessation of the drug (relapse group), and 28 patients remained in remission when checked at 12 to 20 months after treatment (remission group). Serum FT3 to FT4 ratios [(pg/ml/ng/dl) x 10] were less than 55 throughout ATD therapy in 27 of the 28 remission patients whereas the ratios of the relapse group exceeded 55 from the early phase of methimazole treatment in 10 of 16 patients. In eight of these 10 patients the increased ratios were detected within three months of therapy (1 month, 3 patients; 2 months, 4 patients; 3 months, 1 patient). The ratios for the remaining two patients rose above 55 at the fifth and sixth months. There was no statistical difference between the remission and relapse groups in the FT3 to FT4 ratios either before nor at the completion of the treatment. However, a clear difference could be measured at a point during the therapy. Those in whom this difference was pronounced later underwent relapse.(ABSTRACT TRUNCATED AT 250 WORDS)

endocrinologia japonica

Serum Free Triiodothyronine to Free Thyroxine Ratio Enables Early Prediction of the Outcome of Antithyroid Drug Therapy in Patients with Graves' Hyperthyroidism.