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Effect of sodium ipodate and iodide on free T4 and free T3 concentrations in patients with Graves’ disease

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Abstract

Graves’ hyperthyroid patients were treated daily for 10 days with 1 g sodium ipodate, a cholecystographic agent which exerts a blocking effect on the peripheral conversion of T4 to T3, or with 12 drops of saturated solution of potassium iodide (SSKI). Serum concentrations of free T4 (FT4) and free T3 (FT3) were measured before, during and 5 and 10 days after the administration of each drug. Sodium ipodate treatment induced a rapid decrement of serum FT4 concentrations which declined from 48.9 ± 6.6 pg/ml to 26.0 ± 2.7 pg/ml. In these patients serum FT3 concentrations declined from 12.4 ± 2.0 pg/ml to 2.5 ± 0.4 pg/ml. Ten days after sodium ipodate withdrawal, serum FT4 and FT3 concentrations returned to baseline values. In patients treated with SSKI serum FT4 concentrations declined from 51.1 ± 8.8 pg/ml to 11.3 ± 1.4 pg/ml and FT3 from 15.7 ± 2 pg/ml to 2.6 ± 0.3 pg/ml. Moreover, after therapy interruption serum free thyroid hormone concentrations returned to baseline values in these patients. Serum FT4 pattern during the study was not different between the two groups of subjects whereas serum FT3 concentrations were significantly lower in patients treated with sodium ipodate. These findings indicate that SSKI and sodium ipodate are effective in inducing a rapid decrement of serum free thyroid hormone concentrations. Therefore the employment of these drugs may be useful in the treatment of patients with thyroid storm and those undergoing thyroidectomy.

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Authors and Affiliations

  1. Cattedra di Endocrinologia e Patologia Costituzionale, I Clinica Chirurgica, Università degli Studi di Parma, and Divisione di Chirurgia, Ospedale S. Maria, Borgotaro, Via Gramsci 14, 43100, Parma, Italy

    G. Robuschi, A. Manfredi, M. Salvi, E. Gardini, M. Montermini, L. d’Amato, E. Borciani, L. Negrotti, A. Gnudi &  E. Roti

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  1. G. Robuschi
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  2. A. Manfredi
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  3. M. Salvi
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  4. E. Gardini
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  5. M. Montermini
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  6. L. d’Amato
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  7. E. Borciani
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  8. L. Negrotti
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  9. A. Gnudi
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  10. E. Roti
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Robuschi, G., Manfredi, A., Salvi, M. et al. Effect of sodium ipodate and iodide on free T4 and free T3 concentrations in patients with Graves’ disease. J Endocrinol Invest 9, 287–291 (1986). https://doi.org/10.1007/BF03346928

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  • DOI: https://doi.org/10.1007/BF03346928

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