Hypothyroidism - New aspects of an old disease

  • Kostoglou-Athanassiou I
  • Ntalles K
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Abstract

Hypothyroidism is divided in primary, caused by failure of thyroid function and secondary (central) due to the failure of adequate thyroid-stimulating hormone (TSH) secretion from the pituitary gland or thyrotrophin-releasing hormone (TRH) from the hypothalamus. Secondary hypothyroidism can be differentiated in pituitary and hypothalamic by the use of TRH test. In some cases, failure of hormone action in peripheral tissues can be recognized. Primary hypothyroidism may be clinical, where free T(4) (FT(4)) is decreased and TSH is increased or subclinical where FT(4) is normal and TSH is increased. In secondary hypothyroidism FT(4) is decreased and TSH is normal or decreased. Primary hypothyroidism is most commonly caused by chronic autoimmune thyroiditis, less common causes being radioiodine treatment and thyroidectomy. Salt iodination, which is performed routinely in many countries, may increase the incidence of overt hypothyroidism. The incidence of clinical hypothyroidism is 0.5-1.9% in women and

Author-supplied keywords

  • Antithyroid antibodies
  • Chronic autoimmune thyroiditis
  • Congenital neonatal hypothyroidism
  • Hypothyroidism
  • Myxedema coma
  • Postpartum thyroiditis

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  • ISSN: 11084189
  • SGR: 77950809919
  • SCOPUS: 2-s2.0-77950809919
  • PUI: 358620621
  • PMID: 20596261

Authors

  • I. Kostoglou-Athanassiou

  • K. Ntalles

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