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Low-Level Methylmercury Exposure as a Risk Factor for Neurologic Abnormalities in Adults *

Abstract Methylmercury is a neurotoxicant that bio-accumulates in the aquatic food chain and is present in all fish. Little is known about the effects of long-term low-dose exposure to methylmercury in adults. The aim of this study was to determine whether a dose–response relationship exists between long-term methylmercury exposure and neurological abnormalities in aboriginal Quebec Cree adults for whom fish is a dietary staple. We re-analysed data from a 1977 cross-sectional study conducted by Kofman and collaborators on a group of Quebec Cree individuals claiming ill health from local fish consumption. In the original 1977 study, 306 adult participants aged 18–82 years were assessed for methylmercury exposure. Tremor and other neurologic outcomes were assessed with a clinical examination. The investigators did not find clinical evidence of methylmercury intoxication based on an analysis of covariance. We used ordinal regression to obtain odds ratios for the relationship between total hair mercury levels and neurologic abnormalities. Hair mercury concentrations ranged from 0.5 to 46 ppm (parts per million). A 6 ppm increase in hair mercury was associated with increasing levels of tremor (OR, 2.22; 95%CI, 1.15–4.26) in adults under 40 years of age. There was no association with nine other outcomes considered, nor with tremor among older persons. Odds ratios were not influenced by gender, smoking, alcohol use, or co-morbidity.

Dose-dependent effects of methylmercury on tremor may occur below the commonly accepted 50 ppm threshold, particularly in young adults. These effects may be detectable by clinical examination. However, the results should be interpreted with caution given that alcohol use was probably under-reported and that multiple outcomes were studied.

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As with any procedure, there could be pain or other substantial risks involved. These concerns should be discussed with your health care provider prior to any treatment so that you have proper informed consent and understand that there are no guarantees to healing.

THE INFORMATION IN THIS WEBSITE IS OFFERED FOR GENERAL EDUCATIONAL PURPOSES ONLY AND DOES NOT IMPLY OR GIVE MEDICAL ADVICE. No Doctor/Patient relationship shall be deemed to have arisen simply by reading the information contained on these pages, and you should consult with your personal physician/care giver regarding your medical treatment before undergoing any sort of treatment or therapy.

Published on 03-31-2009
Authors: Nathalie Auger1, Oscar Kofman3, Tom Kosatsky1, 2 and Ben Armstrong