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  • Title: The changes in dioxin concentrations in the blood of Yusho patients from 2004 to 2010.
    Author: Todaka T, Uchi H, Hirakawa H, Takao Y, Kajiwara J, Furue M.
    Journal: Fukuoka Igaku Zasshi; 2013 Apr; 104(4):118-27. PubMed ID: 23858790.
    Abstract:
    We measured the concentrations of polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs), and polychlorinated biphenyls (PCBs) in blood collected from Yusho patients during medical health examinations performed from 2004 to 2010. Out of the 242 and 200 Yusho patients who received medical health examinations in 2004 and 2010, respectively, the concentrations of PCDDs, PCDFs, and PCBs in the blood of 136 patients were measured in both of those years. The concentrations of individual congeners of PCDDs, PCDFs, and PCBs in the blood of these 136 Yusho patients measured in 2004 were compared with those measured in 2010. Among individual congeners of PCDDs, PCDFs, and PCBs, most congeners of these compounds did not significantly decrease from 2004 to 2010. However, the concentrations of 1, 2, 3, 4, 6, 7, 8-heptaCDD, octaCDD, 1, 2, 3, 4, 7, 8-hexaCDF, tetraCB 52/69, pentaCB 101, octaCB 198/201, and octaCB 196/203 in the blood of Yusho patients were significantly decreased from 2004 to 2010. In addition, the concentrations of 1, 2, 3, 6, 7, 8-hexaCDD, 2, 3, 4, 7, 8-pentaCDF, and 1, 2, 3, 6, 7, 8-hexaCDF tended to decrease slightly from 2004 to 2010. These findings suggest that the PCDDs, PCDFs, and PCBs have remained in the blood of Yusho patients for a very long time, with over 40 years having passed since the outbreak of Yusho.
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