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05-Aug-2017 15:05

The final conclusions of the 200-page volume are penetrating. The term primary hypothyroidism indicates decreased thyroidal secretion of thyroid hormone by factors affecting the thyroid gland itself; the fall in serum concentrations of thyroid hormone causes an increased secretion of TSH resulting in elevated serum TSH concentrations. Thyroid status, cardiovascular risk, and mortality in older adults: the cardiovascular health study. Decreased thyroidal secretion of thyroid hormone can also be caused by insufficient stimulation of the thyroid gland by TSH, due to factors directly interfering with pituitary TSH release (secondary hypothyroidism) or indirectly by diminishing hypothalamic TRH release (tertiary hypothyroidism); in clinical practice it is not always possible to discriminate between secondary and tertiary hypothyroidism, which are consequently often referred to as central hypothyroidism. Studies from other countries like the USA report essentially similar data. Growth hormone/insulin-like growth factor axis in patients with subclinical thyroid dysfunction. Of particular interest are risk factors for development of hypothyroidism.

In a third (uncommon) form of hypothyroidism, regulation and function of thyroid gland are intact. Instead, manifestations of hormone deprivation arise from a disorder in the target tissues that reduces their responsiveness to the hormone (peripheral tissue resistance to thyroid hormone) or that inactivates the hormone (in massive infantile hemangiomas). Subclinical hypothyroidism and functional mobility in older adults.