Maternal hypothyroxinaemia during the first half of gestation in an iodine deficient area with endemic cretinism and related disorders

Abstract

OBJECTIVE Iodine deficiency is well known as the cause of several disorders such as endemic goitre and cretinism, along with a wide spectrum of psychoneurological development disorders including endemic mental deficiency and endemic cognitive deficiency, which are generally correlated to damage to the fetus. Such damage Is, by Inference, deemed a consequence either directly of iodine deficiency or of insufficient availability of thyroxine at the feto-placental unit level. Early pregnancy represents the crucial period for neurogenesis in the embryo. Several experimental studies have emphasized the direct role of maternal T4 in neurological embryo-genesis, before the onset of fetal thyroid function and, therefore, Its protective role In fetal thyroid failure. The objective of this study was to evaluate whether Iodine deficiency may Influence thyroid status of pregnant women throughout the first half of pregnancy. DESIGN Thyroid function tests including total and free T4 and T3, TBG and TSH along with urinary iodine excretion were measured In the serum of pregnant women from an iodine deficient endemic goitre area In north-eastern Sicily, at 8, 13 and 20 weeks of gestation. The times of sampling were chosen to correspond approximately to a period prior to, coincident with and after the onset of fetal thyroid function, respectively. SUBJECTS The longitudinal study was undertaken In 16 euthyroid pregnant women from the iodine deficient area in which major iodine deficiency disorders such as endemic cretinism and endemic cognitive deficiency In schoolchildren still persist (area A) and in 7 age matched volunteer pregnant women from a marginally iodine sufficient area (area B). MEASUREMENTS Hormones and TBG were measured using commercial kits. Urinary iodine was measured by an automated method. RESULTS The divergent changes In serum T4 and TBG with pregnancy progression induced a progressive TBG desaturation by T4 during the whole study period (from 22 to 17% in area A, ANOVA two-way F = 18-9, PPt(= 2.7 Pr=−0.54, PF= 6.0, PF= 3.4, P<0.05) a significant T3/T4 molar ratio Increase was observed. CONCLUSIONS Iodine deficiency induces in early pregnancy a series of events (reduced synthesis of maternal T4, TBG desaturation by T4, critical decrease of FT4 levels with consequent TSH increase) responsible for overt or marginal biochemical hypothyroidism in about 50% of pregnant women. It is hypothesized that the Imbalance of maternal thyroid hormone homeostasis during pregnancy as a consequence of endemic iodine deficiency may be responsible for the impaired psychoneurological development observed In children from that area so appropriate Iodine and/or thyroxine prophylaxis to women In that region may prevent the neuro-behavloural, cognitive and motor compromise of the population.