The spectrum of postpartum thyroid dysfunction: diagnosis, management, and long-term prognosis.

OBJECTIVE

To provide an overview of thyroid abnormalities that can occur after delivery.

METHODS

We review the diagnosis and management of various types of postpartum thyroid dysfunction.

RESULTS

A common problem during the postpartum period, thyroid dysfunction is found in approximately 5% of new mothers in the general population. Such thyroid dysfunction can manifest in various forms (hyperthyroid or hypothyroid, transient or persistent), each of which necessitates different treatment. The most common type of thyroid dysfunction is destructive thyrotoxicosis, which is due to the aggravation of autoimmune thyroiditis. It occurs at 1 to 3 months after delivery as sudden thyrotoxicosis and lasts for 1 to 3 months, after which transient hypothyroidism may ensue in some cases. Simply symptomatic treatment may be sufficient for such transient thyroid dysfunctions. Postpartum Graves' disease is found in approximately 11% of the cases of postpartum thyroid dysfunction. Graves' hyperthyroidism usually occurs at 3 to 6 months after parturition. In the treatment of postpartum Graves' disease, one may choose radioactive iodine, antithyroid drugs, or surgical therapy; however, transient Graves' hyperthyroidism, which often occurs in patients with postpartum Graves' disease, may require neither radioactive iodine therapy nor thyroidectomy. Mothers at high risk for development of postpartum thyroid dysfunction can be screened by testing for antimicrosomal antibodies. Although a strong correlation exists between the presence of antimicrosomal antibodies and postpartum thyroid dysfunction, the cost-effectiveness of screening for postpartum autoimmune thyroid syndrome remains controversial.

CONCLUSION

For optimal management of the postpartum conditions of Graves' disease, destructive thyrotoxicosis, and hypothyroidism, the clinician should be aware of diagnostic techniques that will facilitate early intervention or will prompt careful surveillance.