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  • Title: Comparison of radioiodine with radioiodine plus lithium in the treatment of Graves' hyperthyroidism.
    Author: Bogazzi F, Bartalena L, Brogioni S, Scarcello G, Burelli A, Campomori A, Manetti L, Rossi G, Pinchera A, Martino E.
    Journal: J Clin Endocrinol Metab; 1999 Feb; 84(2):499-503. PubMed ID: 10022407.
    Abstract:
    Effectiveness of radioiodine for Graves' hyperthyroidism depends also on its intrathyroidal persistence. The latter is enhanced by lithium by blocking iodine release from the thyroid. One hundred ten patients with Graves' hyperthyroidism were randomly assigned to treatment with radioiodine or radioiodine plus lithium, stratified according to goiter size (< or =40 or >40 mL) and evaluated for changes in thyroid function and goiter size, at monthly intervals, for 12 months. Cure of hyperthyroidism occurred in 33 of 46 patients (72%) treated with radioiodine and in 45 of 54 patients (83%) treated with radioiodine plus lithium. The probability of curing hyperthyroidism was higher and its control prompter (P = 0.02) in the radioiodine-plus-lithium group. Patients with < or =40-mL goiters had similar persistence of hyperthyroidism (13%), but lithium-treated patients had hyperthyroidism controlled earlier (P = 0.04). Among patients with >40-mL goiters, hyperthyroidism was cured in 6 of 15 patients (40%) treated with radioiodine alone and in 12 of 16 patients (75%) treated with radioiodine plus lithium (P = 0.07), and cure occurred earlier in the latter (P = 0.05). Goiters shrank in both groups (P < 0.0001), more effectively and promptly (P < 0.0005) in the radioiodine-plus-lithium group. Serum free T4 and T3 levels increased shortly after therapy only in the radioiodine group (P < 0.01). Lithium carbonate enhances the effectiveness of radioiodine therapy, in terms of prompter control of hyperthyroidism, in patients with small or large goiters. In the latter group, lithium also increases the rate of permanent control of hyperthyroidism.
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