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  • Title: Prediction of post-partum Graves' thyrotoxicosis by measurement of thyroid stimulating antibody in early pregnancy.
    Author: Hidaka Y, Tamaki H, Iwatani Y, Tada H, Mitsuda N, Amino N.
    Journal: Clin Endocrinol (Oxf); 1994 Jul; 41(1):15-20. PubMed ID: 7914152.
    Abstract:
    OBJECTIVE: Autoimmune thyroid diseases often occur after delivery. However, it has been difficult to predict who will develop Graves' thyrotoxicosis after delivery. We tried to establish a systematic method for predicting post-partum onset of Graves' thyrotoxicosis. DESIGN: We followed up the pregnant women with antithyroid microsomal antibody (MCAb) from early pregnancy to the post-partum period and analysed the relation between the activities of thyroid stimulating antibodies (TSAb) in early pregnancy and post-partum occurrence of Graves' disease. PATIENTS: Seventy-one women with positive MCAb in early pregnancy were studied. They were randomly selected from 262 MCAb-positive subjects found in 3405 consecutive early pregnant women who attended our maternity clinic during the last ten years. MEASUREMENTS: MCAb was measured with a commercially available agglutination kit. For 71 MCAb-positive subjects, TSH-binding inhibitory immunoglobulin (TBII) and TSAb were measured in early pregnancy, and serially until 6 months after delivery for the subjects with either positive TBII or TSAb. Thyroid function and goitre size were recorded at every observation. RESULTS: Among the 71 subjects, 7 showed positive TSAb in early pregnancy without any thyroid dysfunction; all 7 developed thyroid dysfunction in the post-partum period. Five of them (70% of TSAb-positive subjects) developed Graves' disease, two showing persistence and three transiently. None of 64 TSAb-negative subjects developed Graves' thyrotoxicosis, though 44 developed various types of thyroid dysfunction as a result of post-partum autoimmune thyroiditis. CONCLUSION: The individuals at high risk of post-partum onset of Graves' thyrotoxicosis can be found early in their pregnancy by the detection of TSAb. Overall occurrence of post-partum Graves' disease in the general population is estimated above 0.54%, that is, one in 200 post-partum women may develop Graves' thyrotoxicosis, although thyrotoxicosis may be transient in half of the patients.
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