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[DOC File]Genetic Defects in Thyroid Hormone Synthesis and Action
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Linear regression was used to compare TSH levels (and Free T4 levels) in school-age children by city of residence. Because Antofagasta has non-detectable perchlorate in drinking water, it was used as the reference city for comparisons with Chañaral (low exposure) and Taltal (highest exposure).
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[DOCX File]International Association of Medical Thermographers
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Some physicians use a low-normal range therapeutic target for TSH when patients have undetectable serum Tg levels and have had no recurrence 5-10 years after thyroidectomy. If iodide intake is sufficient, L-T4 suppression therapy is rarely an effective treatment strategy for reducing the size of goiters.
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[DOC File]LABORATORY MEDICINE PRACTICE GUIDELINES
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The prompt activation of pituitary TSH secretion after cold exposure of the rats12,13 is possibly due in part to a direct effect on the hypothalamus.14 Exposure to cold has also resulted in augmented TRH production, and serum levels,16 and blunted responses of TSH to exogenous TRH.17 These effects have not been reproduced by other ...
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[DOC File]EFFECTS OF PERCHLORATE IN DRINKING WATER
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In Vivo Effects. In general, the serum TSH level is affected less by medications than thyroid hormone concentrations (Table 1). For example, Estrogen-induced TBG elevations raise serum TT4 levels but do not affect the serum TSH concentration, because pituitary TSH secretion is controlled by the FT4 independent of binding-protein effects.
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Low TSH: Causes, Symptoms, and How it Affects T3 and T4
The disease, known as resistance to TSH (OMIM #275200) is inherited as an autosomal recessive trait, and patients are characterized by elevated serum TSH levels, absence of goiter with a normal or hypoplastic gland, and normal to very low serum levels of thyroid hormones.
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[DOC File]CHAPTER 5
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What are the effects of thyroid hormone on the body? Sasha’s blood work indicated abnormally low levels of T3 and T4 and abnormally high levels of TSH. Do the results indicate a problem with the hypothalamus, the pituitary gland, or the thyroid gland? Why? Why were TSH levels high while T4 and T3 were low?
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Negative Feedback Regulation of Hypothalamus and
Among people >60 years of age, a low TSH level is associated with increased risk for atrial fibrillation, which in turn could lead to congestive heart failure. 83,91 It is interesting to speculate on the basis of the high prevalence of pulmonary artery hypertension that many of the signs of heart failure, such as neck vein distension and peripheral edema, may be caused by right heart strain.
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Effects of low tsh levels