- 著者
- Kenji Iwaku Jaeduk Yoshimura Noh Eiji Sasaki Nami Suzuki Tosiaki Kameda Sakiko Kobayashi Ai Yoshihara Hidemi Ohye Natsuko Watanabe Miho Suzuki Masako Matsumoto Yo Kunii Koji Mukasa Kiminori Sugino Koichi Ito
- 出版者
- (社)日本内分泌学会
- 雑誌
- Endocrine Journal (ISSN:09188959)
- 巻号頁・発行日
- vol.61, no.9, pp.875-881, 2014 (Released:2014-09-29)
- 参考文献数
- 20
- 被引用文献数
- 2 11
Following the accident at the Fukushima Daiichi Nuclear Power Station which occurred on March 11, 2011 due to the Eastern Japan Great Earthquake (the Accident), there have been concerns over elevation of the risk of thyroid cancer among children due to internal exposure to radioactive iodine. In Fukushima Prefecture, screening of children with thyroid ultrasonography has been carried out, yielding numerous findings, suggesting a possible influence from the Accident. We report thyroid ultrasonographic findings, used by similar device at Fukushima Prefecture’s study, at Ito-hospital. Of the 2721 children aged 15 or less who visited our hospital between January 2005 and March 2013, 1214 children (330 boys and 884 girls; median age, 12; range of age, 4-15) were covered by evaluation of thyroid ultrasonographic findings, excluding children known in advance to have thyroid disease on the basis of disease history, palpation and blood tests. Among these 1214 children, 709 children (58.4%) were found cysts (≤5 mm in 665 cases) by ultrasonography, 43 children (3.5%) were found nodules (≤5 mm in 18 cases) and 9 children (5.2%) were found an intrathyroid ectopic thymus. Analysis of the data before and after the Accident using the same device, involving age adjustment on the basis of the standard population in 2010, showed no difference in the incidence rate of cysts or nodules. In children examined, the incidence rate of cyst formation (particularly ≤5 mm) was higher, and there was no difference in the incidence rate of cysts or nodules between the pre- and post-accident period.
- 著者
- Yo Kunii Takashi Uruno Koji Mukasa Kenichi Sekiya Kenji Iwaku Akifumi Suzuki Kiminori Sugino Jaeduk Yoshimura Noh Koichi Ito
- 出版者
- (社)日本内分泌学会
- 雑誌
- Endocrine Journal (ISSN:09188959)
- 巻号頁・発行日
- vol.63, no.1, pp.21-27, 2016 (Released:2016-01-31)
- 参考文献数
- 20
- 被引用文献数
- 1 5
In the event of a nuclear power plant accident, prophylactic administration of potassium iodide (KI) is recommended to prevent thyroid damage due to uptake of radioiodine. To assess the inhibitory effect of low-dose inorganic iodine on thyroidal radioactive iodine uptake (RAIU) in healthy adults without dietary iodine restriction, single or repeated doses of 10 mg inorganic iodine solution were given to 22 Japanese volunteers, 18 men and 4 women with the mean age of 35.7 years, between 2011 and 2013. Changes in urinary iodine excretion, thyroid function and 24-hour RAIU were also evaluated. The median 24-hour RAIU without iodine restriction was 13 % (range, 5-26 %). A single-dose of 10 mg inorganic iodine suppressed the median 24-hour RAIU measured one hour after iodine administration to 3 % (range, 1-7 %) and, in 90.9% of 22 participants their 24-hour RAIU was < 5 %. For seven participants given 10 mg of inorganic iodine daily for 14 days, the median 24-hour RAIU measured at 24 hours after the last administration of iodine was 6 % (range, 2-12 %), although the inhibitory effect was diminished in two participants. Serum thyroid stimulating hormone concentration was slightly elevated in three participants without decreased serum FT3 and FT4 levels. We conclude that a single-dose of 10 mg inorganic iodine is sufficient to inhibit RAIU in adults, although the inhibitory effect of repeated-dose on RAIU is diminished when KI is given once daily. The dose, duration or interval of iodine administration should be evaluated in iodine-sufficient regions in a future.