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Amiodarone has both direct and indirect effects on thyroid function. The most notable indirect thyroid altering property is that the drug is approximately one-third iodine by weight. As a result, amiodarone therapy elevates free circulating iodine levels up to 40 times greater than the iodine intake from the average American diet. [2]
In iodinated contrast administration for medical imaging, monitoring is indicated in people with thyroid disease, such as toxic multinodular goiter, Graves' disease, or Hashimoto's thyroiditis. [3] Otherwise, for the general population, routine screening with thyroid function tests is generally not feasible. [3]
Thyroid function tests (TFTs) is a collective term for blood tests used to check the function of the thyroid. [1] TFTs may be requested if a patient is thought to suffer from hyperthyroidism (overactive thyroid) or hypothyroidism (underactive thyroid), or to monitor the effectiveness of either thyroid-suppression or hormone replacement therapy.
The TTSI is used as a screening parameter for resistance to thyroid hormone due to mutations in the THRB gene, where it is elevated. [4] It is also beneficial for assessing the severity of already confirmed thyroid hormone resistance, [ 6 ] even on replacement therapy with L-T4, [ 7 ] and for monitoring the pituitary response to substitution ...
Both of these factors contribute to the effects of amiodarone on thyroid function. [20] [45] [47] [48] Amiodarone also causes an anti-thyroid action, via Plummer and Wolff–Chaikoff effects, due its large amount of iodine in its molecule, which causes a particular "cardiac hypothyroidism" with bradycardia and arrhythmia. [49] [50]
Thyroid disease is a medical condition that affects the structure and/or function of the thyroid gland. The thyroid gland is located at the front of the neck and produces thyroid hormones [ 1 ] that travel through the blood to help regulate many other organs, meaning that it is an endocrine organ .
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