Abstract
Purpose
Previous animal studies have reported that acute anticholinesterase pesticide (organophosphate and carbamate) poisoning may affect thyroid hormones. However, there is no human study investigating the association between hypothyroidism and anticholinesterase pesticide poisoning, and therefore, we conducted a retrospective nationwide population-based cohort study to delineate this issue.
Methods
We identified 10,372 anticholinesterase pesticide poisoning subjects and matched 31,116 non-anticholinesterase pesticide poisoning subjects between 2003 and 2012 from the Nationwide Poisoning Database and the Longitudinal Health Insurance Database 2000, respectively, in a 1:3 ratio by index date, age, and sex for this study. We compared the cumulative incidence of hypothyroidism between the two cohorts by following up until 2013. Independent predictors for hypothyroidism were also investigated.
Results
In total, 75 (0.72%) anticholinesterase pesticide poisoning subjects and 184 (0.59%) non-anticholinesterase pesticide poisoning subjects were diagnosed with hypothyroidism during the follow-up. Cox proportional hazard regression analysis showed that anticholinesterase pesticide poisoning subjects had higher risk for hypothyroidism than did non-anticholinesterase pesticide poisoning subjects (adjusted hazard ratio: 1.47, 95% confidence interval: 1.11–1.95) after adjusting for age, sex, hypertension, malignancy, liver disease, renal disease, atrial fibrillation or flutter, thyroiditis, goiter, other endocrine disorders, and mental disorder. Stratified analysis showed that anticholinesterase pesticide poisoning subjects had higher risk for hypothyroidism than did non-anticholinesterase pesticide poisoning subjects in terms of the age subgroup of 40–64 years, female sex, past history of goiter, follow-up of <1 month, and anticholinesterase pesticide poisoning subjects without atropine treatment (incidence rate ratio [IRR]: 1.66, 95% confidence interval: 1.20–2.30). Female sex, malignancy, renal disease, thyroiditis, goiter, mental disorder, and anticholinesterase pesticide poisoning without atropine treatment were independent predictors for hypothyroidism.
Conclusions
Anticholinesterase pesticide poisoning is associated with increased risk for hypothyroidism. Early evaluation of thyroid function in anticholinesterase pesticide poisoning subjects is suggested, especially in subjects without atropine treatment, aged 40–64 years, female sex, and past history of goiter.
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Acknowledgements
This study was support by Grants CMFHR10636 from Chi-Mei Medical Center. This study is based in part on data from the National Health Insurance Research Database provided by the Bureau of National Health Insurance, Department of Health, and managed by the National Health Research Institutes. The interpretation and conclusions contained herein do not represent those of the National Health Insurance Administration, Department of Health, or the National Health Research Institutes.
Author contributions
H.S.H., C.C. Huang, and H.J.L. designed the study, interpreted the data, and wrote the manuscript. C.H.H. did the statistical analysis. K.W.L., S.B.S., and J.J.W. provided clinical experience and helped in drafting the manuscript. C.C. Huang and H.J.L. supervised the whole study and were responsible for all communication. All authors read and approved the final manuscript.
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The authors declare that they have no competing interests.
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Hung-Sheng Huang and Keng-Wei Lee contributed equally to this work.
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Huang, HS., Lee, KW., Ho, CH. et al. Increased risk for hypothyroidism after anticholinesterase pesticide poisoning: a nationwide population-based study. Endocrine 57, 436–444 (2017). https://doi.org/10.1007/s12020-017-1373-7
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DOI: https://doi.org/10.1007/s12020-017-1373-7