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Neurobehavioral changes in Taiwanese lead-exposed workers.

Shun-Sheng Chen1, Tsan-Ju Chen, Chuang-Hao Lin

  • 1Department of Neurology, Kaohsiung Chang Gung Memorial Hospital, Chang Gung University, Kaohsiung County, Taiwan. neuron@ms2.hinet.net

Journal of Occupational and Environmental Medicine
|September 13, 2005
PubMed
Summary

Lead exposure in workers can cause subtle central nervous system (CNS) dysfunction, affecting neurobehavioral functions like memory and attention, even without obvious cognitive deficits.

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Area of Science:

  • Neuroscience
  • Occupational Health
  • Toxicology

Background:

  • Lead exposure is a significant occupational hazard.
  • Chronic lead exposure can lead to central nervous system (CNS) dysfunction.
  • Subtle neurobehavioral deficits may occur even at moderate blood lead levels (BLLs).

Purpose of the Study:

  • To evaluate the central nervous system (CNS) dysfunction in lead-exposed workers.
  • To identify specific neurobehavioral impairments associated with elevated blood lead levels (BLLs).

Main Methods:

  • Recruited male workers with at least 3 years of lead exposure and elevated BLLs.
  • Assigned workers into medium (40-80 microg/dL) and low (<40 microg/dL) BLLs groups.
  • Compared neurobehavioral functions of 61 lead-exposed workers with 62 non-exposed controls using a computerized evaluation system.

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Main Results:

  • Workers in the medium BLLs group exhibited significantly impaired neurobehavioral functions.
  • Impairments included slowed psychomotor task performance, reduced visual-spatial processing, and memory deficits.
  • Poor attentional control and response execution accuracy were also observed in the medium BLLs group.

Conclusions:

  • Subtle CNS dysfunction is detectable in lead-exposed workers.
  • Neurobehavioral testing can identify deficits not apparent through standard neurological or cognitive assessments.
  • Early detection of CNS dysfunction is crucial for managing occupational lead exposure.