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[RTH syndrome--resistance to thyroid hormone syndrome].

C B Christensen1, S Vadstrup

  • 1Medicinsk afdeling, Centralsygehuset i Slagelse.

Ugeskrift for Laeger
|September 28, 2001
PubMed
Summary
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Resistance to thyroid hormone (RTH) syndrome presents unique diagnostic challenges. This case highlights difficulties in managing RTH, where thyroid hormone levels may not align with clinical presentation.

Area of Science:

  • Endocrinology
  • Molecular Endocrinology
  • Clinical Medicine

Background:

  • Resistance to thyroid hormone (RTH) syndrome is a rare disorder characterized by reduced sensitivity of target tissues to thyroid hormones.
  • It is typically caused by mutations in the thyroid hormone receptor beta (TR$eta$) gene.
  • Accurate diagnosis and management can be challenging due to variable clinical manifestations.

Observation:

  • A patient with a long history of symptoms initially diagnosed with inappropriate thyroid-stimulating hormone (TSH) secretion was presented.
  • The patient underwent partial thyroidectomy for suspected thyrotoxicosis and subsequent treatment with levothyroxine (Eltroxin).
  • Thyroid function tests were difficult to interpret clinically, and the patient experienced palpitations and myxedema symptoms with varying Eltroxin doses.

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Findings:

  • The patient's myxedema symptoms resolved with a 75 $\mu$g/day Eltroxin dose, but higher doses exacerbated cardiac symptoms (palpitations).
  • No underlying heart disease was identified in the patient.
  • This case illustrates the complex interplay between thyroid hormone levels, receptor resistance, and clinical symptoms.

Implications:

  • This case underscores the importance of considering RTH syndrome in patients with discordant thyroid function tests and clinical symptoms.
  • Optimal management of RTH requires careful titration of thyroid hormone replacement therapy to balance symptom control and avoid adverse effects.
  • Further research into the specific mechanisms of RTH and individualized treatment strategies is warranted.