イタイイタイ病の現状と今後

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書誌事項

タイトル別名
  • Itai-Itai Disease: Cadmium-Induced Renal Tubular Osteomalacia
  • イタイイタイビョウ ノ ゲンジョウ ト コンゴ
  • —Current Situations and Future Perspectives—

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Cadmium (Cd) is one of the most toxic elements to which humans could be exposed at work or in the environment. The outbreak of itai-itai disease, which is the most severe stage of chronic Cd poisoning, occurred in the Cd-polluted Jinzu River basin in Toyama. In this area, the river was contaminated by slag from a mine upstream; as a consequence, the soil in rice paddies was polluted with heavy metals including Cd through irrigation water from around 1910 to the 1960s. The government of Toyama prefecture carried out an extensive survey on Cd concentration in rice and soil of the paddy fields and declared that the upper layer of a total of 1500 ha of paddy fields should be replaced by nonpolluted soil. Then, an intervention program of soil replacement in the polluted paddy fields was continually carried out from 1980 to 2011. As a result, Cd concentration in rice markedly decreased. The kidney is the organ critically affected after long-term exposure to Cd. Proximal tubular dysfunction (RTD) has been found among the inhabitants of the Jinzu River basin. The very recent report by the Environmental Agency in Japan in 2009 has disclosed that b2-microglobulinuria with RTD is still found at a high prevalence among the inhabitants of the Jinzu River basin of both sexes. Twenty patients with itai-itai disease (1 male and 19 females), who attended our hospital and received medical examination during 2000 to 2008, had applied for recognition as itai-itai disease patients to the government of Toyama prefecture. In this paper, the recent epidemiological and clinical features of itai-itai disease are discussed on the basis of a review of the cases of these 19 female patients.<br>

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