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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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Hypothyroidism is a disorder characterized by insufficient production of thyroid hormones, which regulate metabolism, energy balance, and multiple organ systems.TypesHypothyroidism is classified based on the level of dysfunction. Primary hypothyroidism results from intrinsic thyroid gland dysfunction, causing reduced hormone production despite normal or increased stimulation. Secondary hypothyroidism arises from inadequate thyroid-stimulating hormone (TSH) secretion by the pituitary. Tertiary...
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Partial target organ resistance to thyroid hormone.

H H Bode, M Danon, B D Weintraub

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    This study investigates a boy with elevated thyroid hormones but normal basal metabolic rate, suggesting partial resistance to thyroid hormone. Despite high hormone levels, his pituitary gland remained responsive, indicating a unique endocrine disorder.

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    Area of Science:

    • Endocrinology
    • Molecular Biology
    • Genetics

    Background:

    • Thyroid hormone resistance is a rare condition characterized by decreased tissue sensitivity to thyroid hormones.
    • This case presents an 8-year-old boy with clinical euthyroidism despite biochemical hyperthyroidism.

    Purpose of the Study:

    • To investigate the underlying mechanisms of thyroid hormone resistance in a pediatric patient.
    • To evaluate the integrity and responsiveness of the hypothalamic-pituitary-thyroid axis.

    Main Methods:

    • Hormone level measurements (T4, free T4, T3, TSH) were performed.
    • Stimulation tests with thyrotropin-releasing hormone (TRH) and suppression tests with triiodothyronine (T3) were conducted.
    • Basal metabolic rate (BMR) and insensible water loss were assessed.

    Main Results:

    • The patient exhibited elevated serum thyroid hormone levels with normal BMR and insensible water loss.
    • The pituitary-thyroid axis was intact, with a TSH response to TRH and T3 suppression.
    • Partial resistance to thyroid hormone was suggested by the hormonal profile and response to T3 treatment.

    Conclusions:

    • The findings suggest a diagnosis of partial resistance to thyroid hormone in this patient.
    • The pituitary gland demonstrated unusual sensitivity to TRH and insensitivity to T3/T4 suppression.
    • Further research is needed to elucidate the specific molecular mechanisms of this condition.