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[Euthyroid sick syndrome]
Schweizerische Medizinische Wochenschrift
|February 8, 1986
Summary
Euthyroid sick syndrome involves altered thyroid hormone metabolism in illness, often decreasing T3 and increasing rT3 while T4 remains normal. Distinguishing it from hypothyroidism and hyperthyroidism is crucial for accurate diagnosis and treatment.
Area of Science:
- Endocrinology
- Internal Medicine
Context:
- Euthyroid sick syndrome (ESS) describes thyroid hormone level alterations in non-thyroidal illnesses.
- These metabolic changes are frequently observed across diverse disease states.
Purpose:
- To elucidate the hormonal profile of euthyroid sick syndrome.
- To differentiate ESS from primary hypothyroidism and hyperthyroidism.
Summary:
- ESS is characterized by decreased serum triiodothyronine (T3) and often increased reverse T3 (rT3), with normal thyroxine (T4).
- In severe illness, T4 may decrease, impacting the free T4 index, but serum TSH remains normal, distinguishing it from hypothyroidism.
- Transient T4 elevations can occur due to drug interference, complicating differentiation from hyperthyroidism.
Impact:
- Accurate diagnosis of ESS prevents misdiagnosis and inappropriate treatment of thyroid dysfunction.
- Understanding ESS hormonal shifts aids in managing critically ill patients.