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Low blood levels of the thyroid hormones — triiodothyronine (T3) and thyroxine (T4) — signal the hypothalamus to release the thyrotropin-releasing hormone (TRH). TRH then reaches the pituitary gland and stimulates the release of thyroid-stimulating hormone(TSH) into the bloodstream.
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Goiter refers to an abnormal enlargement of the thyroid gland that may appear as a diffuse goiter (uniform enlargement) or nodular (single or multiple nodules). Functionally, it is classified as nontoxic (normal/low hormone levels) or toxic (excess hormone production).PathophysiologyDiffuse thyroid enlargement typically results from prolonged stimulation by thyroid-stimulating hormone (TSH) or TSH-like agents, commonly seen in hypothyroidism or iodine deficiency. In contrast, in hyperthyroid...
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Graves’ disease is an autoimmune disorder characterized by the production of thyroid-stimulating immunoglobulins (TSI) that activate TSH receptors, leading to excessive synthesis and release of thyroid hormones (T3 and T4) and resulting in hyperthyroidism.Among all causes of hyperthyroidism, Graves’ disease is the most common and can happen at any age, though it is more frequent in women. It produces a hypermetabolic state with features such as weight loss, tachycardia, tremor,...
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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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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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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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[Correlation between iodine urinary levels and pathological changes in thyroid glands].

Paulo César Ribeiro Boasquevisque, Robson Dettman Jarske, Cleia Coelho Dias

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    |January 10, 2014
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    Summary
    This summary is machine-generated.

    This study found excessive iodine intake in a Brazilian population, with most urine samples exceeding recommended limits. This excess iodine intake correlated with a higher incidence of inflammatory thyroid disease (thyroiditis).

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    Area of Science:

    • Endocrinology
    • Public Health
    • Pathology

    Background:

    • Iodine is essential for thyroid hormone synthesis.
    • Iodine deficiency and excess can both lead to thyroid dysfunction.
    • Assessing iodine nutrition is crucial for public health.

    Purpose of the Study:

    • To evaluate iodine nutritional status in a specific Brazilian population.
    • To investigate the relationship between urinary iodine levels and thyroid pathology.
    • To identify potential public health implications of iodine intake.

    Main Methods:

    • Analysis of urinary iodine concentration in 30 random urine samples.
    • Histopathological examination of 55 thyroid glands from deceased individuals.
    • Correlation analysis between iodine levels and observed thyroid changes.

    Main Results:

    • Over 96% of urine samples showed urinary iodine levels exceeding the WHO recommended limit of 300 mg/L.
    • Thyroid tissue analysis revealed histological changes consistent with thyroiditis in 25.5% of cases.
    • Elevated urinary iodine was associated with female participants and thyroid inflammation.

    Conclusions:

    • The studied population exhibits excessive iodine intake.
    • A higher prevalence of inflammatory thyroid disease (thyroiditis) is linked to this iodine excess.
    • Findings suggest a need for monitoring and potential intervention regarding iodine consumption levels.