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[Thyroid function in patients with Yusho].

Hiroshi Tsuji1, Yasuo Ito

  • 1Department of Internal Medicine, Kitakyushu-Tsuyazaki Hospital, Fukuoka 811-3307, Japan.

Fukuoka Igaku Zasshi = Hukuoka Acta Medica
|July 23, 2003
PubMed
Summary

Polychlorinated biphenyl (PCB) exposure in Yusho patients frequently caused elevated thyroid stimulating hormone (TSH) levels, indicating latent hypothyroidism. However, this thyroid dysfunction showed no direct correlation with blood PCB concentrations.

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Area of Science:

  • Endocrinology
  • Environmental Health
  • Toxicology

Context:

  • Yusho disease, a condition caused by accidental consumption of contaminated rice oil, provides a unique cohort for studying chronic environmental toxin exposure.
  • Polychlorinated biphenyls (PCBs) are persistent organic pollutants with known endocrine-disrupting potential.
  • Thyroid hormone homeostasis is crucial for overall health and can be sensitive to environmental insults.

Purpose:

  • To investigate the long-term impact of polychlorinated biphenyl (PCB) exposure on thyroid function in patients with Yusho.
  • To determine the relationship between serum PCB levels and thyroid hormone profiles (TSH, T3, T4) in this population.

Summary:

  • Thyroid function was assessed in 115 Yusho patients in 2002.
  • Elevated thyroid stimulating hormone (TSH) levels, suggestive of latent hypothyroidism, were observed in 11.3% of patients.
  • No significant correlations were found between blood PCB concentrations and TSH, triiodothyronine (T3), or thyroxine (T4) levels.

Impact:

  • This study highlights the frequent occurrence of thyroid function abnormalities in Yusho patients.
  • Findings suggest that while PCBs may be implicated in Yusho, their direct association with specific thyroid parameter alterations requires further investigation.
  • Contributes to understanding the complex interplay between environmental toxins and endocrine disruption.

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