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  • Title: [Antithyroid agents and embryopathies].
    Author: Bournaud C, Orgiazzi J.
    Journal: Ann Endocrinol (Paris); 2003 Nov; 64(5 Pt 1):366-9. PubMed ID: 15067747.
    Abstract:
    First cause of hyperthyroidism among women of childbearing age, Graves' disease raises the risk of maternal and fetal complications, including eclampsia, cardiac failure, abortion, prematurity, fetal death, all of which can be avoided if maternal hyperthyroidism is closely controlled. The risk of transplacental hyperthyroidism has been shown to correlate to the titre of anti-TSH receptor antibodies and has to be evaluated not only in women treated for Graves' disease during pregnancy, but also in women who have previously received radio iodine treatment or undergone surgery for Graves' disease: TSH-receptor antibodies may indeed remain at a high level several years after initial treatment. Both methimazole and propylthiouracil are equally effective to restore maternal euthyroidism. Accumulation of case-reports relating congenital malformations (mostly aplasia cutis, but in some cases, severe malformations) among the offspring of methimazole-treated women suggests the possibility of a teratogenic effect of methimazole. Despite the fact that the link between severe congenital defects and methimazole exposure during pregnancy is not formally established, propylthiouracil should be preferred to methimazole for the treatment of young hyperthyroid women.
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