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Therapy with propylthiouracil for T3-predominant neonatal Graves' disease: a case report
Emi Hamajima1, Masahiro Noda1, Emina Nai1
1Department of Pediatrics, Showa General Hospital, Tokyo, Japan.
Insights
This case report details a male neonate with Graves
Area of Science:
- Neonatal Endocrinology
- Pediatric Endocrinology
- Thyroid Disorders
Background:
- Maternal Graves' disease can impact neonatal thyroid function.
- Neonatal Graves' disease presents unique challenges in thyroid hormone management.
- Thyroxine (T3)-predominant Graves' disease requires specific therapeutic approaches.
Purpose of the Study:
- To describe a case of neonatal Graves' disease with T3-predominant hyperthyroidism.
- To report the management of persistent pulmonary hypertension and airway stenosis in this neonate.
- To evaluate the efficacy of propylthiouracil in managing difficult-to-control neonatal Graves' disease.
Main Methods:
- Treatment involved inorganic iodine, thiamazole, and levothyroxine sodium hydrate.
- Propylthiouracil was added to suppress T4 to T3 conversion.
- Antithyroid drug therapy was managed, followed by levothyroxine for central hypothyroidism.
Main Results:
- Initial treatments were insufficient for thyroid function control.
- Combination therapy including propylthiouracil successfully managed thyroid levels.
- The neonate recovered from pulmonary hypertension and airway stenosis, with normal development.
Conclusions:
- Propylthiouracil is effective in managing T3-predominant neonatal Graves' disease.
- Early intervention with propylthiouracil can aid in controlling hyperthyroidism and its complications.
- This case highlights the importance of tailored treatment strategies for neonatal thyroid disorders.
Abstract:
This case report describes a male neonate with Graves' disease. The mother's pregnancy was complicated by poorly controlled Graves' disease. The neonate was diagnosed with thyroxine (T3)-predominant Graves' disease with low free triiodothyronine (T4) and high free T3 during antithyroid drug therapy. The patient also presented with persistent pulmonary hypertension of the newborn due to hyperthyroidism and airway stenosis caused by goiter. It was difficult to control thyroid function and maintain free T4 levels with inorganic iodine, thiamazole, and levothyroxine sodium hydrate. We successfully controlled thyroid function using the previous treatments in combination with propylthiouracil. Propylthiouracil suppresses type 1 iodothyronine deiodinase, and its pharmacological action suppresses the conversion of T4 to T3. Therefore, we used propylthiouracil at an earlier stage of intervention in this case. We ceased administration of antithyroid drugs on day 85 of life. Subsequently, as the TRH loading test revealed central hypothyroidism, oral administration of levothyroxine sodium hydrate was continued. Its administration was discontinued at the age of 1 yr. Thyroid-stimulating hormone recovered to normal values, and his development had progressed without complications by the age of 2 yr.