ACTA ENDOCRINOLOGICA (BUC)

Radioiodine treatment of hyperthyroidism is easy to perform, has a low cost and presents a low risk adverse effects.\r\nDespite many reports on the efficiency and results, the number of studies investigating the efficiency of radioiodine treatment in subclinical hyperthyroidism is limited.\r\nAim. Therefore, this study aimed to investigate the efficiency of radioiodine treatment in subclinical hyperthyroidism.\r\nMethods. The study involved 50 patients with subclinical hyperthyroidism (42 females, 8 males, mean age: 60.3?10.8)\r\ntreated by radioiodine in our department. Thirtyfour (68%) of the 50 patients had multinodular hyperplasia; 9 (18%) had diffuse hyperplasia, and 7 (14%) had solitary nodule.\r\nThe patients were applied I-131 treatment with a dose of 5-20 mCi (mean 11.52?3.63 mCi) based on the thyroid gland volumes, TSH levels, age, any clinical findings, and\r\nalso, the type of hyperplasia (diffuse or nodular hyperplasia). The patients were followed for 5.13 to 46.5 months (mean: 24.62?11.47).\r\nResults. Forty-three (86%) of the 50 patients were euthyroid after a mean of 2.36?1.18 months following radioiodine\r\ntreatment. The mean dose of radioiodine was 11.91?3.73 mCi. Only 5 (10%) of 50 patients developed hypothyroidism 1-5 months (mean: 2.8?1.48) after radioiodine therapy with 8-10\r\nmCi (mean: 8.4?0.89) I-131 administration. When hypothyroidism is also considered as a criterion for cure in addition to euthyroidism, the success rate of radioiodine treatment was 96% (48/50) in the patients with subclinical\r\nhyperthyroidism.\r\nConclusion. Radioiodine treatment provides quick and high efficiency of recovery, easy application, and quick\r\nadaptation by patient; thus, it can be a preferred choice of subclinical hyperthyroidism treatment, particularly for the\r\nelderly patients who cannot adapt treatment with antithyroid tablets easily.