Examkin

Soru

Zorluk: OrtaEndocrinology and Metabolism

Correlate each of the described clinical scenarios with its characteristic pattern of thyroid function testing.

  • Tender, enlarged thyroid gland with fever and palpitations following a viral upper respiratory infectionSuppressed TSH, elevated free T4, elevated erythrocyte sedimentation rate, and low radioiodine uptake
  • Prolonged intensive care unit admission for severe sepsis and multiorgan failureLow-normal TSH, normal free T4, markedly decreased total T3, and elevated reverse T3
  • Weight loss and tachycardia with an atrophic, nonpalpable thyroid gland in a healthcare workerSuppressed TSH, elevated free T4, and nearly undetectable serum thyroglobulin
  • New-onset isolated hypercholesterolemia discovered during a routine examination of an otherwise asymptomatic patientElevated TSH, normal free T4, and normal total T3 levels

Cevap

1 matches with the inflammatory high T4/low uptake profile; 2 matches with the high reverse T3 profile; 3 matches with the low thyroglobulin profile; 4 matches with the isolated high TSH profile.
The correct matches require distinguishing the pathophysiologic mechanisms of varying thyroid states. Subacute thyroiditis presents with a painful goiter, high T4, low TSH, high ESR, and low radioiodine uptake due to glandular destruction. Euthyroid sick syndrome is an adaptive response to severe illness, showing low T3 and high reverse T3 due to altered peripheral conversion. Factitious thyrotoxicosis shows high T4 and low TSH, but uniquely low thyroglobulin because exogenous hormone suppresses endogenous gland function. Subclinical hypothyroidism features isolated TSH elevation with normal T4, often discovered via hyperlipidemia.

Adım Adım Çözüm

1
Analyze the clinical scenario of the post-viral painful thyroid.
Identified as subacute granulomatous (de Quervain) thyroiditis.
The inflammation causes release of preformed hormones and decreased iodine uptake, with elevated inflammatory markers.
2
Evaluate the critically ill patient in the intensive care unit.
Identified as euthyroid sick syndrome.
Severe illness alters peripheral deiodination, reducing T3 and increasing reverse T3 without primary thyroid pathology.
3
Assess the healthcare worker with thyrotoxicosis and a nonpalpable gland.
Identified as factitious thyrotoxicosis (exogenous thyroid hormone intake).
Exogenous hormone suppresses TSH and thyroglobulin production, while the gland atrophies.
4
Examine the asymptomatic patient with new hyperlipidemia.
Identified as subclinical hypothyroidism.
Mild thyroid dysfunction often first presents with elevated TSH, normal T4, and altered lipid metabolism.

Anahtar Kavram

Differentiation of thyroid disorders based on integrated laboratory profiles, including TSH, free T4, T3, reverse T3, thyroglobulin, and radioiodine uptake.
Bu soruyu puanla

Konular

Endocrinology and Metabolism

Bu konudan daha fazla soru