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The effect of acute trichloroethylene exposure on electroretinogram components
L Blain1, P Lachapelle, S Molotchnikoff
1Département des Sciences Biologiques, Université de Montréal, Québec, Canada.
Neurotoxicology and Teratology
|November 1, 1990
Summary
Acute trichloroethylene (TCE) exposure significantly reduces the electroretinogram (ERG) b-wave in rabbits. Oscillatory potentials (OPs) offer a more sensitive measure of TCE retinal toxicity, with OP4 showing dose-dependent changes.
Area of Science:
- Neuroscience
- Toxicology
- Ophthalmology
Background:
- Trichloroethylene (TCE) is an industrial solvent with known neurotoxic effects.
- The electroretinogram (ERG) and its components, like oscillatory potentials (OPs), are used to assess retinal function.
- Understanding TCE's impact on visual pathways is crucial for occupational health and safety.
Purpose of the Study:
- To investigate the acute effects of TCE exposure on rabbit ERG and OPs.
- To determine if OPs are more sensitive indicators of TCE retinal toxicity than the ERG b-wave.
Main Methods:
- Adult New Zealand rabbits were anesthetized with urethane.
- Intravenous emulsified TCE was administered at doses ranging from 24 to 85 mg/kg.
- ERG and OPs were recorded under photopic conditions up to 250 minutes post-injection.
Main Results:
- TCE exposure caused a significant (p < 0.001) 50% reduction in the ERG b-wave amplitude across all doses.
- Low TCE doses significantly reduced OP4 amplitude, sometimes leading to extinction.
- Higher TCE doses resulted in a marked increase in OP4 amplitude.
Conclusions:
- The ERG b-wave is significantly impaired by acute TCE exposure.
- Oscillatory potentials, particularly OP4, exhibit differential responses to TCE, suggesting they are more sensitive indicators of retinal toxicity.
- OPs may serve as a better biomarker for assessing the level of TCE-induced retinal toxicity compared to the ERG b-wave.