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Related Experiment Videos

Thyroid function in children with nephrotic syndrome

S Ito1, K Kano, T Ando

  • 1First Department of Paediatrics, Dokkyo University School of Medicine, Tochigi, Japan.

Pediatric Nephrology (Berlin, Germany)
|August 1, 1994
PubMed
Summary
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Children with untreated nephrotic syndrome experience mild hypothyroidism due to significant urinary losses of thyroid hormones, including thyroxine (T4) and tri-iodothyronine (T3), and thyroid-binding globulin (TBG).

Area of Science:

  • Pediatric Endocrinology
  • Nephrology
  • Thyroid Research

Background:

  • Nephrotic syndrome is characterized by heavy proteinuria and edema.
  • Thyroid hormone levels and binding proteins can be altered in nephrotic syndrome.
  • The impact of untreated nephrotic syndrome on thyroid function in children requires further elucidation.

Purpose of the Study:

  • To compare thyroid function in children with untreated nephrotic syndrome to those in remission and healthy controls.
  • To investigate the relationship between urinary protein loss and thyroid hormone/binding protein excretion.
  • To determine the prevalence of hypothyroidism in children with active nephrotic syndrome.

Main Methods:

  • Compared thyroid function tests (serum T4, T3, TBG, free T4, free T3, TSH) in three groups: untreated nephrotic children, nephrotic children in remission, and age-matched controls.

Related Experiment Videos

  • Analyzed urinary excretion of thyroid hormones and TBG.
  • Correlated urinary protein excretion with thyroid hormone/TBG levels and serum albumin with TSH.

    • Main Results:

    • Untreated nephrotic children showed significantly lower serum thyroxine (T4), tri-iodothyronine (T3), and thyroid-binding globulin (TBG).
    • Mean serum free T4 and free T3 were lower, and mean TSH was higher in untreated patients compared to those in remission.
    • Massive urinary losses of T4, T3, TBG, free T4, and free T3 were observed in untreated nephrotic children, correlating positively with urinary protein excretion.

    Conclusions:

    • Children with untreated nephrotic syndrome exhibit evidence of mild hypothyroidism.
    • Urinary losses of thyroid hormones and TBG contribute to altered thyroid function in nephrotic syndrome.
    • Proteinuria in nephrotic syndrome leads to significant loss of thyroid-related proteins, impacting thyroid hormone availability.