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  • Title: Changes in serum TSH receptor antibody (TRAb) values in patients with Graves' disease after total or subtotal thyroidectomy.
    Author: Takamura Y, Nakano K, Uruno T, Ito Y, Miya A, Kobayashi K, Yokozawa T, Matsuzuka F, Kuma K, Miyauchi A.
    Journal: Endocr J; 2003 Oct; 50(5):595-601. PubMed ID: 14614216.
    Abstract:
    TSH receptor antibodies (TRAb) are generally regarded as mediators of thyroid stimulation in Graves' disease. In addition, a high serum TRAb value during pregnancy is one of the risk factors for intrauterine death, prematurity, and fetal or neonatal hyperthyroidism. Recently, correlations between a high serum TRAb value and endocrine opthalmopathy were also suggested. Surgical resection of the thyroid is usually followed by a reduction of serum TRAb levels in variable degrees. The relation between the extent of the thyroidectomy and the degree of reduction is still controversial. In addition, the changes in the TRAb value after total thyroidectomy (TT) over a long period of time have never been studied. We studied the changes in serum TRAb values after TT and subtotal thyroidectomy (ST) for more than 7 years. Forty-one patients with Graves' disease underwent TT, and 99 patients underwent ST. The serum TRAb values and the ratio of the patients who achieved normal values among each group (normalization rates of TRAb) at 3 and 6 months, 1, 3, 5 and 7 years after surgery were compared between the TT group and ST group. The mean preoperative TRAb values were not significantly different between the TT and ST groups, and the mean TRAb values measured 3, 6 and 12 months after surgery were not significantly different between the groups. However, the TRAb values measured 3, 5 and 7 years after surgery were significantly (p<0.05) lower in the TT group than in the ST group (16.7 +/- 3.3% vs 28.0 +/- 2.6%, 12.6 +/- 3.4% vs 29.3 +/- 3.8%, 5.6 +/- 0.9% vs 25.4 +/- 4.1%, respectively). The normalization rates of TRAb were not significantly different between the groups until 1 year after surgery. However, the normalization rates 3, 5 and 7 years after surgery were significantly (p<0.05) higher in the TT group than in the ST group (65.7% vs 42.4%, 77.3% vs 46.7%, 100% vs 59.1%, respectively). The surgical complication rates of TT were similar to ST except for permanent hypoparathyroidism. TT is a treatment option for Graves' disease, especially in patients with a high TRAb value who wish to have children or who have Graves' opthalmopathy.
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