A new hospital letter for the specialist clinic. The thyroid clinic.
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Biomedical subjects
Publications and source records attributed to W D Alexander.
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Ninety patients who had a recurrence of thyrotoxicosis after thyroidectomy have been reviewed. All 10 patients who had a second operation and 18 out of 20 patients treated with a full course of antithyroid drugs relapsed. These results differ greatly from the results of treatment of the first episode of thyrotoxicosis, whether by thyroidectomy or antithyroid drugs. Radioiodine is the treatment of choice in this group of patients, despite the high incidence of hypothyroidism.
One hundred and thirty patients who relapsed after a full course of treatment with antithyroid drugs have been reviewed. Of 22 patients receiving a second course of antithyroid drugs, 17 (77%) relapsed. In contrast, only 2 out of 44 patients treated by surgery relapsed and seven became hypothyroid. Nevertheless, local complications, in particular parathyroid insufficiency, were especially common in this group. Eighty patients received radioiodine, 11 (14%) requiring more than three doses before finally being rendered euthyroid. Postradiation hypothyroidism developed in 39 (49%) patients.
Differences in the metabolic fate of antithyroid drugs influence the optimal frequency of administration and their therapeutic efficacy. (35)S propylthiouracil differed from the (35)S imidazoles (carbimazole and methimazole) in the more rapid absorption and excretion and the shorter biological half-life in the plasma of the former. Renal function may have a more important influence on the biological half-life of the drugs than thyroid status. Further work is required to determine the optimal frequency of administration for each compound.