Active clinical trials for "Hyperthyroidism"

The primary objective of this study is to evaluate the potential of a new large field CZT gamma camera to estimate the thyroid uptake (TU) on Single photon emission computed tomography (SPECT) and SPECT/CT images in comparison with standard planar scintigraphy. The secondary objective is to analyze the diagnostic contribution of SPECT/CT imaging.

The purpose of this trial is to correlate fetal thyroid hormones from fetal cord blood with clinical (maternal antithyroid drug dose and antithyroid antibodies) and ultrasound (US) parameters of fetal thyroid function from pregnant mothers with autoimmune thyroid disease (AITD).

The aim of this study is to develop a metabolome signature of thyroid hormone status. The metabolome signature could be useful in diagnosis and treatment of thyroid dysfunction diseases, especially in cases where TSH cannot be reliably used.

Overt hyperthyroidism and hypothyroidism are associated with inverted hemodynamic changes.Regional blood flow disturbances (including intrathyroidal) were also reported in these thyroid disorders. The purpose of this study is to investigate the thyroid vascularity and blood flow by Color Flow Doppler Sonography in patients with subclinical thyroid dysfunction

MAIN OBJECTIVE : To assess the consequences of a maternal hyperthyroïd during pregnancy on intellectual development of the child from 6 to 9 years SECONDARY OBJECTIVES : To assess the consequences of a maternal hyperthyroïd during pregnancy on the capacities of attention, learning process and the degree of hyperactivity of the child from 6 to 9 years. To study if it exist differences of intellectual development, capacities of attention, learning process, and degree of hyperactivity in the child from 6 to 9 years, born to hyperthyroid mother during pregnancy, according to: the etiology of the maternal hyperthyroïd (transitory gestation hyperthyroid versus disease of Basedow), the use or not of a anti-thyroid treatment, the rate of TSH néonatal (measured with the blotter by tracking with J3 at all the new born ones).

Brown adipose tissue (BAT) is important in energy expenditure through thermogenesis although the regulatory factors are not well known in humans. There is evidence suggesting that the thyroid hormones affect BAT functions in lower mammals, but the effects of the thyroid hormones on BAT activity in humans are still unclear. The objective of this study was to investigate the effects of thyroid hormones on glucose metabolism of BAT and other organs in humans.

The NOMOTHETICOS study is a unicentric cross-sectional study for a quantitative analysis of feedback-inhibition in the thyrotropic homeostatic control. Structural parameters are obtained in vivo from open-loop analysis in patients with disconnected feedback, i.e. with overt thyroid dysfunction or full dose substitution therapy with levothyroxine.

Low RAIU in patients with hyperthyroidism represents a common obstacle in the treatment with RAI. Therefore, a higher dose of RAI must be administered to cure hyperthyroidism in these patients. If we treat patients with thiamazole before starting RAI treatment, serum TSH will rise and result in an increase in iodine uptake by the thyroid gland. By doing so, the dose of RAI to be administered might be lowered to achieve similar therapeutic efficacy. In the past, either calculated or fixed doses of 131I have been used to treat hyperthyroidism. The supposed advantage of a calculated dose compared to a fixed dose is the lowering of hypothyroidism frequency. However, various research papers have contradicted this statement. Antithyroid drugs and RAI therapy have been widely used in the past, either in combination, or independent from one another. This has been done primarily in older patients, to reduce the risk of exacerbation of hyperthyroid symptoms after initiation of RAI. The use of propylthiouracil has been shown to decrease the response rate after RAI due to radioprotective effects. The use of methimazole and carbimazole did not have a negative effect on treatment failure, as long as the medication was discontinued various days before RAI administration. Although this statement is contested in other studies. It is interesting to evaluate retrospective data of patients treated with RAI to evaluate prognostic factors of treatment respons and post RAI hypothyroidism.

Non invasive methods: maternal antithyroid antibodies and ultrasound measurement of the fetal thyroid gland could be an important tool for detecting fetal thyroid dysfunction in mothers with autoimmune thyroid disease.

The investigators wish to evaluate the effect of thyroid hormones on brown adipose tissue in humans in an observational study on patients with thyrotoxicosis. In the investigators evaluation the investigators will use FDG-PET/CT, indirect calorimetry and fat biopsies in the acute phase of the disease and in the euthyroid phase after treatment. It is the investigators hypothesis that high levels of circulating T3 might affect amount and function of brown adipose tissue.