Thyroid function and circulating antithyroid antibodies in myasthenia gravis
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Abstract
Evaluation of thyroid function in 104 patients with myasthenia gravis by T3, T4, TBG, and TSH radioimmunoassays and the TRH-stimulation test in 47 patients disclosed thyrotoxicosis in 5.7%, preclinical hyperthyroidism probably due to autonomously functioning thyroid tissue in about 10% of patients stimulated with TRH, hypo-thyroidism in 1.9%, and preclinical hypothyroidism in 3.4%. Eighty-four percent were euthyroid. Antithyroid antibody activity was detected by hemagglutination tests. Twelve patients had antithyroglobulin antibodies (Tab), and 28 had antimicrosomal antibodies (Mab). Among the euthyroid myasthenic patients, 7 were Tab-positive and 20 were Mab-positive. Euthyroid antibody-positive patients had a significantly higher TSH response in the TRH stimulation test and may be at high risk for hypothyroidism.
- Copyright 1981 Lippincott Williams & Wilkins, Inc.
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