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Thyroid hormones and illness.

M D Brennan1, R S Bahn

  • 1Division of Endocrinology, Department of Internal Medicine, Mayo Clinic and Mayo Foundation, Rochester, Minnesota 55905, USA.

Endocrine Practice : Official Journal of the American College of Endocrinology and the American Association of Clinical Endocrinologists
|July 15, 2004
PubMed
Summary

Illness can alter thyroid hormone levels, affecting metabolism and transport. These changes, including decreased triiodothyronine production, are usually beneficial but require careful interpretation of thyroid tests in hospitalized patients.

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Area of Science:

  • Endocrinology
  • Metabolic Medicine
  • Neuroendocrinology

Background:

  • Thyroid hormones are crucial for regulating metabolism and bodily functions.
  • Illness can significantly impact thyroid hormone levels, affecting patient outcomes.
  • Understanding these alterations is key to managing critically ill patients.

Purpose of the Study:

  • To review illness-associated changes in thyroid hormone levels.
  • To examine alterations in thyroid hormone metabolism, regulation, and transport during illness.
  • To assess the potential utility of thyroid hormone treatment in severe illness.

Main Methods:

  • Summarized normal pituitary-thyroid function.
  • Categorized thyroid hormone changes observed during illness.

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  • Examined metabolic status and treatment utility in ill patients.

    • Main Results:

    • Illness-associated thyroid hormone alterations are adaptive responses.
    • Changes include decreased triiodothyronine production, reduced serum binding, and suppressed thyrotropin secretion.
    • These hormonal shifts offer insights into thyroid regulation and neuroendocrine adaptation.

    Conclusions:

    • Illness-induced thyroid hormone changes are generally beneficial.
    • Potential for localized tissue hypothyroidism exists.
    • Caution is advised when interpreting thyroid tests in hospitalized patients; further trials are needed for treatment efficacy.