Neonatal hyperthyroidism: neonatal clinical course of two brothers born to a mother with Graves-Basedow disease, before and after total thyroidectomy.

BACKGROUND: About 1-2% of infants born to mothers with Graves' disease or Hashimoto's thyroiditis develop neonatal hyperthyroidism because of transplacental passage of IgG stimulating TSH receptors (TRAb).

OBJECTIVE: To evaluate the effect of maternal total thyroidectomy on neonatal clinical course.

METHODS: We describe two brothers born to a mother with Graves' disease, before and after total thyroidectomy.

RESULTS: The first child showed persistent tachycardia, the presence of TRAb and a laboratory pattern of hyperthyroidism. Lugol's solution was started and then propylthiouracil was added. Digitalis, furosemide and diazepam were necessary for treatment of heart failure, hypertension and irritability. On the 70th day of life, hormone serum levels normalized and treatment was interrupted. TRAb normalized by the third month of life. The second infant was born 2 years after the mother underwent total thyroidectomy. In spite of a laboratory pattern of hyperthyroidism and positivity to TRAb, he showed only considerable weight loss, and no therapy was required.

CONCLUSIONS: TRAb may persist after total thyroidectomy: clinical and instrumental follow-up of the newborn is recommended.