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Thyroid Hormone Replacement During Pregnancy

  • Chapter
Hormone Replacement Therapy

Part of the book series: Contemporary Endocrinology ((COE,volume 13))

Abstract

Thyroid diseases are five to seven times more common in women than men. It has been suggested—although never proven—that multiparity could be a risk factor for such increased prevalence in thyroid pathology. In a follow-up study of women with mild thyroid abnormalities in pregnancy, thyroidal abnormalities never returned to complete normalcy following pregnancies (1). Chronic autoimmune disease, the most common etiology of thyroid pathology in areas of sufficient iodine supply, occurs frequently; however the incidence varies with the criteria for diagnosis, the decade when the study was performed and the patients studied (2). In autopsy studies, the prevalence of chronic thyroiditis varies form 5–45% in women and 1–20% in men, according to the severity of the pathologic findings (3). When thyroid antibodies are measured, the incidence is 10–13% in women and 3% in men and increases with age (4). The incidence rate of positive thyroid antibodies in asymptomatic pregnant women is between 6–19.6% (5, 6). It is two to three times higher in women with type 1 diabetes mellitus (7). Immunologic changes occurs throughout normal pregnancy, and it explains the frequent alterations in the natural history of thyroid diseases during and up to 1 yr after delivery (8). Pregnancy is associated with significant—and in most cases reversible—changes in thyroid function.Although never demonstrated with certainty that there is an increase in thyroid production from early pregnancy, laboratory parameters suggest very strongly that such an increase occurs in response to physiologic changes in thyroid economy. In most cases, there is a complete adaptation to this challenge; however, in patients with thyroid pathology, changes in thyroid tests are clearly demonstrated (9,10). The reason(s) for this increase in thyroid demands from very early in pregnancy is not clear; however, there is increasing evidence, that maternal thyroid hormones are important for development of the embryo before fetal thyroid gland becomes functional, which occurs after the 10th wk of gestation.

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Mestman, J.H. (1999). Thyroid Hormone Replacement During Pregnancy. In: Meikle, A.W. (eds) Hormone Replacement Therapy. Contemporary Endocrinology, vol 13. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-59259-700-0_7

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