Abstract
The close relationship between iodine intake and the effects of anti-thyroid drugs (ATD) for Graves' disease (GD) has been well established. However, it remains unknown whether restriction of dietary iodine improves the effect of ATD. This study aimed to clarify this issue in Japanese patients with GD who routinely ingest large amounts of dietary iodine. We performed a prospective clinical study in 81 patients with newly diagnosed GD who were divided into an iodine restricted group and a control group. Urinary iodine, thyroid hormones and TSH receptor antibody were measured during the first 8 weeks of ATD therapy. Urinary iodine concentrations in the iodine restricted group were significantly lower than in the control group (p=0.043). However, there were no significant differences in the decrease of thyroid hormones and TSH receptor antibody between the two groups. Restriction of dietary iodine does not ameliorate the effect of ATD therapy for GD in an area of excessive iodine intake.
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