Management of hypo- and hyperthyroidism during pregnancy

Area of Science:

• Endocrinology
• Reproductive Medicine
• Maternal-Fetal Medicine

Background:

• Pregnancy profoundly influences thyroid function regulation and the prevalence of thyroid disorders.
• Maternal thyroid dysfunction carries significant implications for fetal and neonatal development.
• Early gestation maternal hypothyroxinemia poses potential risks to the developing fetus.

Purpose of the Study:

• To highlight the critical need for recognizing, assessing, and managing thyroid disorders during pregnancy.
• To discuss the implications of maternal thyroid alterations on fetal development.
• To review the causes and management considerations for hyperthyroidism in pregnancy, including Graves' disease and gestational transient thyrotoxicosis (GTT).

Main Methods:

• Review of existing literature on thyroid function during pregnancy.
• Discussion of physiological changes affecting maternal thyroid.
• Analysis of implications of maternal thyroid dysfunction on fetal outcomes.

Main Results:

• Pregnancy acts as a stimulatory challenge to the thyroid, potentially causing hypothyroxinemia and goitrogenesis, especially with restricted iodine intake.
• Overt thyroid dysfunction affects 1-2% of pregnant women, with milder forms being more common and often unrecognized.
• Graves' disease in pregnancy typically exacerbates in the first trimester and ameliorates in later trimesters; antithyroid drugs require careful consideration due to placental transfer.

Conclusions:

• Maternal thyroid dysfunction requires careful management due to its impact on fetal development.
• Screening algorithms for thyroid dysfunction in pregnancy have been proposed but lack systematic implementation and cost-effectiveness analysis.
• Understanding the altered natural history of conditions like Graves' disease during pregnancy is essential for appropriate patient care.