PMID: 7993156Dec 12, 1994Paper

Enhanced susceptibility to amiodarone-induced hypothyroidism in patients with thyroid autoimmune disease

Archives of Internal Medicine
E MartinoL Braverman


The iodine-rich antiarrhythmic drug, amiodarone, can induce both thyrotoxicosis and hypothyroidism, the former being more frequent in iodine-deficient areas, the latter in iodine-sufficient areas. In this study we evaluated prospectively thyroid function in amiodarone-treated patients with positive or negative baseline thyroid autoantibody test results who resided in a moderately iodine-deficient area of Italy. Two groups of patients received long-term amiodarone treatment: Group 1 included 13 patients with negative thyroid autoantibody test results. Group 2 consisted of seven patients with positive thyroid autoantibody test results and thyroid ultrasound patterns compatible with Hashimoto's thyroiditis. The control group (group 3) included 16 untreated euthyroid patients with Hashimoto's thyroiditis. All subjects resided in a mildly iodine-deficient area of Italy (Southern Sardinia) and had low urinary iodine values. Patients in groups 1 and 2 had markedly elevated urinary iodine excretion during treatment. The follow-up period ranged from 6 to 29 months in group 1, from 4 to 9 months in group 2, and from 12 to 55 months in group 3. Two (15%) of 13 patients in group 1 with nodular goiter developed thyrotoxicosis. No patient in...Continue Reading


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