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  • Title: Thyrotrophin-blocking antibodies in congenital hypothyroidism.
    Author: Kung AW, Low LC.
    Journal: J Paediatr Child Health; 1992 Feb; 28(1):50-3. PubMed ID: 1348178.
    Abstract:
    The role of transplacental transfer of maternal thyrotrophin (TSH)-blocking antibodies causing congenital hypothyroidism in Southern Chinese children was examined in this study. Twenty-two mothers of 24 patients with congenital hypothyroidism were studied 3-5 years after delivery. None of them had thyroid dysfunction at delivery or at the time of study. None had antithyroglobulin or antimicrosomal antibody. Only one mother was found to have TSH-binding inhibitory immunoglobulin (TBII), and her child had agenesis of the thyroid. This women had Graves disease in remission for 2 years before delivery. None had TSH-stimulated cAMP response inhibitory immunoglobulin (TSII). Ten of the 24 congenital hypothyroid children had transient neonatal hypothyroidism, seven had agenesis of the thyroid, six had dyshormonogenesis and one had a sublingual thyroid. As none of the mothers who had children with transient neonatal hypothyroidism had blocking antibodies at the time of study, the aetiology of the transient neonatal hypothyroidism remains unclear. These data suggest that maternal TSH-blocking antibodies do not play a role in most cases of sporadic congenital hypothyroidism.
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