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  • Title: A follow-up study of 85 patients with Graves' disease in remission who developed undetectable serum thyroid-stimulating hormone concentrations using sensitive TSH assays.
    Author: Nagai K, Tamai H, Mukuta T, Morita T, Matsubayashi S, Kuma K, Nakagawa T.
    Journal: Horm Res; 1991; 35(5):185-9. PubMed ID: 1802821.
    Abstract:
    Eighty-five patients with Graves' disease in clinical remission after treatment for over 1 year by methimazole therapy (36 patients, group A) or subtotal thyroidectomy (49 patients, group B) who became undetectable for serum thyrotropin levels (TSH less than 0.05 mU/l), were further followed for 1 year or more. Eight patients in group A (22%) and 7 patients in group B (14%) relapsed. Eleven patients in group A (30%) and 5 patients in group B (10%) had fluctuating patterns of free T4 in the upper normal to slightly supranormal range indicative of subclinical hyperthyroidism. The remaining patients continued to have undetectable TSH levels or restored normal TSH levels and normal thyroid hormone concentrations in sera. The results of the present study indicate that the occurrence of undetectable serum TSH concentrations in Graves' disease patients previously treated with methimazole or surgery are not necessarily predictive of clinical relapse because the eventual outcome is variable.
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