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Radioactive iodine thyroid uptake in patients with amiodarone-iodine-induced thyroid dysfunction
in European Journal of EndocrinologyAbstract. Amiodarone, an iodine-rich drug, represents at the present, at least in Europe, one of the most common sources of iodine-induced thyroid dysfunction. The drug may induce both hypothyroidism and thyrotoxicosis. In spite of the large iodine intake occurring during amiodarone therapy, 131I thyroid uptake is detectable in patients with amiodarone-iodine-induced hypothyroidism, irrespective of the presence or absence of underlying thyroid disease. In contrast, in patients with amiodarone-iodine-induced thyrotoxicosis, 131I thyroid uptake is normal or even elevated in those with co-existent underlying thyroid disorders, whereas it is very low in those with an apparently normal thyroid gland. Perchlorate discharge test was performed in 8 patients with hypothyroidism and in 5 patients with hyperthyroidism induced by amiodarone: a positive test was found in all hypothyroid patients and a negative test in all hyperthyroid patients.
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