Thyrotoxicosis during pregnancy.

The diagnosis of thyrotoxicosis during pregnancy is difficult on clinical grounds only. The determination of free thyroid hormones or free thyroid hormone indices is important and is possibly supplemented by the TRH stimulation test. Thyrotoxicosis during pregnancy should always be treated actively. The authors recommend subtotal thyroidectomy if there are indications for surgical therapy (nodular goitre or large diffuse goitre). Otherwise treatment with thyrostatic agents is used. After operation during pregnancy, substitution with thyroid hormones should be given throughout the pregnancy in order to avoid deterious effects of possible maternal hypothyroidism. Antithyroid treatment should be continued till after delivery. Beta-receptor blockers are used only as adjuncts but are not recommended as the sole therapy.