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The radioactive iodine uptake test is a type of scan used in the diagnosis of thyroid problems, particularly hyperthyroidism.It is entirely different from radioactive iodine therapy (RAI therapy), which uses much higher doses to destroy cancerous cells.
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.
Compensatory mechanisms preventing thyrotoxicosis in oversupply with iodine The Wolff–Chaikoff effect [ 1 ] is a presumed reduction in thyroid hormone levels caused by ingestion of a large amount of iodine .
The Merck Manual of Geriatrics was introduced in 1990, focusing on health care for older patients. The Merck Manual of Health & Aging is a consumer edition. The Manuals for human health were converted to a web-based format in 2015 and are hosted on MerckManuals.com in the US and Canada, and MSDManuals.com throughout the rest of the world.
These are normal in the other forms, and in thyrotoxicosis the levels of thyroxine and triiodothyronine are elevated, with resultant suppression of TSH production by the pituitary gland. [ 1 ] [ 6 ] Various other investigations are usually performed to separate the different causes of hyperthyroidism .
Thyrotoxicosis is the condition that occurs due to excessive thyroid hormone of any cause and therefore includes hyperthyroidism. [3] Some, however, use the terms interchangeably. [ 5 ] Signs and symptoms vary between people and may include irritability, muscle weakness, sleeping problems, a fast heartbeat , heat intolerance , diarrhea ...
However, a controlled study on 31 Graves' disease patients found that while patients had subjective reports of cognitive deficits in the toxic phase of Graves' thyrotoxicosis, formal testing found no cognitive impairment and suggested the reported symptoms may reflect the affective and somatic manifestations of hyperthyroidism. [33]
Thyrotoxicosis factitia (alimentary thyrotoxicosis, exogenous thyrotoxicosis) [1] [2] is a condition of thyrotoxicosis caused by the ingestion [3] of exogenous thyroid hormone. [ 4 ] [ 5 ] It can be the result of mistaken ingestion of excess drugs, such as levothyroxine [ 6 ] and triiodothyronine , [ 7 ] or as a symptom of Munchausen syndrome .