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Hyperthyroidism is a hypermetabolic state caused by elevated levels of thyroid hormones, triiodothyronine (T3) and thyroxine (T4). It results from dysregulation at the thyroid, pituitary, or immune system level and affects multiple organ systems.PathophysiologyThe most common cause of hyperthyroidism is Graves’ disease, an autoimmune disorder in which antibodies, specifically thyroid-stimulating antibodies (TSAb), a subtype of TSH receptor antibodies (TRAb), bind to and activate TSH...
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Hyperthyroidism is a type of thyrotoxicosis characterized by the thyroid gland's overproduction of the thyroid hormones triiodothyronine (T3) and thyroxine (T4). This hormone excess increases the basal metabolic rate and enhances sensitivity to catecholamines.DiagnosisDiagnosis is based on clinical features and biochemical testing. It typically shows suppressed thyroid-stimulating hormone (TSH) levels below 0.4 mIU/L, with elevated free T3 and/or T4. Additional tests, including thyroid...
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Graves' disease is an autoimmune disorder that causes hyperthyroidism, or overactivity of the thyroid gland. It results from autoantibodies called thyroid-stimulating immunoglobulins (TSIs), which bind to thyroid-stimulating hormone (TSH) receptors, leading to overstimulation of hormone production and a hypermetabolic state.EtiologyAlthough considered idiopathic, Graves’ disease has well-established contributing factors. There is a strong genetic component, with increased prevalence...
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Amiodarone-induced myxoedema coma.

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A 62-year-old man developed severe hypothyroidism after amiodarone treatment for atrial fibrillation. Prompt levothyroxine therapy led to full recovery, highlighting the importance of monitoring thyroid function during amiodarone use.

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Area of Science:

  • Cardiology
  • Endocrinology
  • Pharmacology

Background:

  • Amiodarone is a widely used antiarrhythmic drug.
  • Amiodarone is known to cause thyroid dysfunction.
  • Subclinical thyroid disease may increase the risk of amiodarone-induced hypothyroidism.

Observation:

  • A 62-year-old man presented with bradycardia, hypothermia, and respiratory failure 3 weeks after starting amiodarone for atrial fibrillation.
  • Laboratory tests revealed markedly elevated thyroid-stimulating hormone (TSH) and suppressed free thyroxine (FT4).
  • The patient had a history of subclinical hypothyroidism.

Findings:

  • The patient received intravenous levothyroxine, leading to hemodynamic and mental status recovery within 48 hours.
  • Thyroid ultrasound showed diffuse heterogeneity, and iodine excretion was significantly elevated.
  • This case is the most thoroughly investigated amiodarone-induced myxedema coma reported, with a favorable outcome.

Implications:

  • This case underscores the critical need for vigilant thyroid function monitoring in patients treated with amiodarone, especially those with pre-existing thyroid abnormalities.
  • Early diagnosis and aggressive thyroid hormone replacement are crucial for managing amiodarone-induced myxedema coma.
  • Further research is warranted to elucidate the mechanisms and optimize treatment strategies for this potentially fatal condition.