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The thyroid hormone (TH) plays a pivotal role in the intricate orchestration of physiological processes, exerting profound effects on development, metabolism, and homeostasis throughout different life stages.
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Low blood levels of the thyroid hormones — triiodothyronine (T3) and thyroxine (T4) — signal the hypothalamus to release the thyrotropin-releasing hormone (TRH). TRH then reaches the pituitary gland and stimulates the release of thyroid-stimulating hormone(TSH) into the bloodstream.
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Calcitonin, a vital polypeptide hormone, regulates calcium levels within body fluids. It is released by the parafollicular cells, also known as C cells, situated in the follicular epithelium of the thyroid gland. Calcitonin responds to fluctuations in blood calcium levels and the influence of gastrointestinal hormones like gastrin and cholecystokinin.
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Thyroid function in critically ill infants with infections.

N Uzel, O Neyzi

    Pediatric Infectious Disease
    |September 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

    Infant critical illness alters thyroid function, showing low triiodothyronine (T3) and high reverse triiodothyronine (rT3). Fatal cases had lower thyroxine (T4) and T3 levels, indicating prognostic value.

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    Area of Science:

    • Pediatric Endocrinology
    • Critical Care Medicine
    • Neonatology

    Background:

    • Thyroid hormone levels are crucial for infant development.
    • Critical illness can significantly impact metabolic and endocrine functions in infants.

    Purpose of the Study:

    • To investigate thyroid function, including thyroxine (T4), triiodothyronine (T3), reverse triiodothyronine (rT3), and thyroid-stimulating hormone (TSH), in infants experiencing critical illness.
    • To assess the prognostic value of thyroid hormone levels in relation to patient outcomes.

    Main Methods:

    • Serum concentrations of T4, T3, rT3, and TSH were measured in 13 critically ill infants.
    • Patients were categorized based on prognosis (fatal vs. recovered) and compared to control values.

    Main Results:

    • Critically ill infants exhibited significantly low T3 and high rT3 levels compared to controls.
    • Thyroxine (T4) and TSH levels were comparable to controls.
    • Fatal cases showed significantly lower initial and subsequent T4 values than controls.
    • Both fatal and recovered groups had lower initial T3 than controls.
    • Recovered infants showed a relative increase in T3, while fatal cases experienced a further T3 decrease and normalized rT3 in the terminal stage.

    Conclusions:

    • Thyroid function is significantly altered in critically ill infants, characterized by a "non-thyroidal illness" pattern.
    • Thyroid hormone profiles, particularly T4 and T3 levels, may serve as prognostic indicators in infant critical illness.
    • Further research is warranted to explore the mechanisms and clinical implications of these thyroidal changes.