| A Study of the Etiology of Congenital Hypothyroidism in the Niigata Prefecture of Japan in Patients Born Between 1989 and 2005 and Evaluated at Ages 5-19. | |
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MedLine Citation:
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PMID: 21309714 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Background: The prevalence of congenital hypothyroidism (CH) increased during the period 1994-2002 in Japan. The reasons for these recently described increases in the prevalence of CH remain unclear. Moreover, the proportion of patients with different etiologies CH in the more recently diagnosed patients has not been established. In this study, we determined the etiologies of CH that were detected by neonatal screening in Niigata Prefecture, Japan. Methods: A total of 100 patients having a diagnosis of CH (41 men and 59 women, aged 5-19 years old) were evaluated. To determine the etiology of CH, the patients underwent a (123)I thyroidal radioiodine uptake test, a scintigram, a saliva to plasma radioiodine ratio analysis, a perchlorate discharge test, thyroid ultrasonography, measurements of thyroidal function and thyroglobulin, and a thyrotropin (TSH)-releasing hormone tolerance test. Results: Patients with overt CH (n = 34, elevated TSH levels with low free thyroxine levels) made up 34% of the total group, 56% of the patients had subclinical CH (n = 56, elevated TSH levels with normal free thyroxine levels), and 10% had normal thyroid function. These were patients who were considered to have transient hypothyroidism or hyperthyrotropinemia. Thyroid dysgenesis was the diagnosis in 73% of patients with overt CH, and the most of these had ectopic thyroid tissue. In contrast, thyroid dysgenesis was the diagnosis in only 36% of the patients with subclinical CH. Conclusions: Only 50% of our patients with CH detected by neonatal screening had thyroid dysgenesis. With an increase in the percentage of patients with subclinical hypothyroidism, the prevalence of thyroid dyshormogenesis has increased. Studies of the frequency and etiology of CH should consider overt and subclinical CH separately. |
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Authors:
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Keisuke Nagasaki; Tadashi Asami; Yohei Ogawa; Toru Kikuchi; Makoto Uchiyama |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-2-10 |
Journal Detail:
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Title: Thyroid : official journal of the American Thyroid Association Volume: - ISSN: 1557-9077 ISO Abbreviation: - Publication Date: 2011 Feb |
Date Detail:
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Created Date: 2011-2-11 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9104317 Medline TA: Thyroid Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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1 Division of Pediatrics, Department of Homeostatic Regulation and Development, Niigata University Graduate School of Medicine and Dental Sciences , Niigata, Japan . |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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