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Thyroid function in thalassaemia major.

M P Senanayake, S A Suraweera, H D Hubert

    The Ceylon Medical Journal
    |July 15, 2000
    PubMed
    Summary
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    This study found no hypothyroidism in iron-overloaded patients with thalassemia major, suggesting routine thyroid screening is unnecessary. Further research is needed to identify other causes of short stature in these patients.

    Area of Science:

    • Endocrinology
    • Hematology
    • Pediatrics

    Background:

    • Short stature is a common complication in thalassemia major patients.
    • Iron overload (hemosiderosis) due to frequent blood transfusions can affect endocrine function.
    • The prevalence of hypothyroidism in Sri Lankan thalassemia major patients has not been previously investigated.

    Purpose of the Study:

    • To assess thyroid hormone levels in patients with thalassemia major.
    • To correlate patient height with age, iron status, and thyroid hormone levels.
    • To determine the necessity of routine hypothyroidism screening in this population.

    Main Methods:

    • A cross-sectional comparative study was conducted.
    • 33 thalassemia major patients (ages 2.5-23 years) and 21 healthy controls were analyzed.

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  • Measurements included anthropometry, skeletal maturity, serum ferritin, and thyroid hormones (T4, TSH).

    • Main Results:

    • Thalassemia major patients exhibited significantly lower height percentiles and standard deviation scores (SDS).
    • Skeletal maturation was delayed in 69% of patients; undernutrition was not observed.
    • Elevated serum ferritin levels were prevalent, with 70% showing heavy iron overload. All patients had normal thyroxine (T4) and predominantly normal thyroid-stimulating hormone (TSH) levels.

    Conclusions:

    • Hypothyroidism was absent in iron-overloaded thalassemia major patients.
    • Thyroid hormone levels remained normal regardless of iron overload severity.
    • Routine hypothyroidism surveillance is deemed unnecessary; other factors contributing to short stature require investigation.