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Maternal thyroid function, iodine deficiency and fetal development.

P O Pharoah, S M Ellis, R P Ekins

    Clinical Endocrinology
    |March 1, 1976
    PubMed
    Summary
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    Dietary iodine deficiency in New Guinea women is linked to increased stillbirths, infant deaths, and endemic cretinism in offspring. This occurs even without clinical signs of hypothyroidism, highlighting a critical public health concern.

    Area of Science:

    • Endocrinology
    • Public Health
    • Human Reproduction

    Background:

    • Dietary iodine deficiency is a significant public health issue in certain regions.
    • Thyroid function plays a crucial role in pregnancy outcomes and fetal development.

    Purpose of the Study:

    • To investigate the relationship between thyroid function and pregnancy outcomes in an iodine-deficient area of New Guinea.
    • To examine the impact of subclinical iodine deficiency on stillbirths, infant deaths, and endemic cretinism.

    Main Methods:

    • Measurements of thyroid function were conducted on women of child-bearing age.
    • Pregnancy outcomes over five years were analyzed in relation to thyroid function indices.
    • Biochemical and clinical assessments were used to evaluate thyroid status.

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    Main Results:

    • Offspring of women with biochemical evidence of iodine deficiency experienced higher rates of stillbirths, infant deaths, and endemic cretinism.
    • These adverse outcomes occurred in the absence of overt clinical hypothyroidism in the mothers.
    • The findings contrast with outcomes in women with untreated myxedema or congenital hypothyroidism.

    Conclusions:

    • Subclinical iodine deficiency during pregnancy poses a significant risk to fetal development and infant survival.
    • Early detection and intervention for iodine deficiency are crucial, even in the absence of clinical hypothyroidism.
    • Understanding these mechanisms is vital for improving maternal and child health in iodine-deficient populations.