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Subclinical abnormalities in workers with continuous low-level toluene exposure.

Hsu-Tzu Shih¹, Chin-Lin Yu, Ming-Tsang Wu

¹Department of Occupational Medicine, Kuang Tien General Hospital, Taiwan, Institute of Environmental Health, China.

Toxicology and Industrial Health

|May 6, 2011

Summary

Continuous exposure to low-level toluene may harm workers' nerves and blood, even at levels previously thought safe. This study highlights potential risks for factory workers, indicating a need for further research into chronic toluene effects.

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Area of Science:

Occupational Health
Toxicology
Neuroscience

Background:

High toluene concentrations cause known toxicity.
Effects of low-level toluene exposure on the autonomic nervous system are understudied.
Controversy exists regarding the health impacts of chronic low-level toluene exposure.

Purpose of the Study:

To investigate the effects of continuous versus intermittent low-level toluene exposure on factory workers.
To assess potential neurotoxic and hematological impacts.
To examine the relationship between toluene exposure and autonomic nervous system function.

Main Methods:

Urine samples collected from 34 male factory workers (Taiwan) after work hiatus and end of week.
Urinary hippuric acid measured via high-performance liquid chromatography (HPLC).
Neurotoxic symptoms assessed via questionnaires, neuropsychiatric tests, and nerve function tests; complete blood work performed.

Main Results:

Increased urinary hippuric acid levels at end of workweek (p < 0.01).
Higher odds of sympathetic and peripheral nerve impairment in continuously exposed workers (OR=4.13, OR=6.94).
Continuously exposed workers showed lower mean platelet counts (p=0.018) and a positive correlation between neurological abnormalities and self-reported symptoms (r=0.35-0.66).

Conclusions:

Continuous low-level toluene exposure may be linked to sympathetic and peripheral nerve dysfunction.
Sub-clinical hematological damage, specifically reduced platelet counts, is associated with continuous exposure.
Further research is warranted to understand the long-term effects of chronic low-level toluene exposure on workers' health.