Hypothyroidism in pregnancy can lead to which fetal complication?

Hypothyroidism in pregnancy can lead to which fetal complication?

• A. Altered fetal brain development
• B. Macrosomia
• C. Polyhydramnios
• D. Anencephaly

Answer: (A)

Fetal brain development depends on maternal thyroid hormones, especially in the first trimester before the fetus begins making enough thyroid hormone on its own. When maternal hypothyroidism is present and not adequately treated, there isn’t enough thyroid hormone crossing the placenta to support critical processes like neuronal migration, synaptogenesis, and myelination. This can result in altered fetal brain development, leading to cognitive and neurodevelopmental problems after birth. That’s why this choice best explains a fetal complication associated with hypothyroidism in pregnancy. Macrosomia, or a large baby, is most commonly linked to maternal diabetes or obesity, not hypothyroidism. Polyhydramnios, excess amniotic fluid, occurs more with diabetes or fetal/placental conditions rather than hypothyroidism. Anencephaly is a neural tube defect related to folate status and other factors, not a direct consequence of maternal thyroid hormone deficiency.

Fetal brain development depends on maternal thyroid hormones, especially in the first trimester before the fetus begins making enough thyroid hormone on its own. When maternal hypothyroidism is present and not adequately treated, there isn’t enough thyroid hormone crossing the placenta to support critical processes like neuronal migration, synaptogenesis, and myelination. This can result in altered fetal brain development, leading to cognitive and neurodevelopmental problems after birth. That’s why this choice best explains a fetal complication associated with hypothyroidism in pregnancy.

Macrosomia, or a large baby, is most commonly linked to maternal diabetes or obesity, not hypothyroidism. Polyhydramnios, excess amniotic fluid, occurs more with diabetes or fetal/placental conditions rather than hypothyroidism. Anencephaly is a neural tube defect related to folate status and other factors, not a direct consequence of maternal thyroid hormone deficiency.