Related Experiment Videos
Electroretinal responses are modified by chronic exposure to trichloroethylene
L Blain1, P Lachapelle, S Molotchnikoff
1Department of ophthalmology, McGill University, Montreal Children's Hospital Research Institute, Canada.
Neurotoxicology
|January 1, 1994
Summary
Trichloroethylene (TRI) inhalation caused significant electroretinal changes in rabbits, affecting vision. These effects, linked to TRI and its metabolite trichloroethanol, were reversible after exposure ceased.
Area of Science:
- Toxicology
- Neuroscience
- Ophthalmology
Background:
- Trichloroethylene (TRI) is an industrial solvent with known neurotoxic potential.
- Understanding TRI's specific effects on the visual system and its metabolites is crucial for occupational safety.
Purpose of the Study:
- To investigate the neuro-ophthalmotoxic effects of TRI exposure in rabbits.
- To correlate electroretinal changes with TRI and trichloroethanol blood levels.
Main Methods:
- New Zealand albino rabbits were exposed to 350 ppm and 700 ppm of TRI via inhalation for 12 weeks.
- Electroretinograms (ERG) and oscillatory potentials (OPs) were recorded weekly.
- Blood samples were analyzed for TRI and trichloroethanol concentrations.
Main Results:
- Significant increases in ERG a- and b-wave amplitudes were observed at both TRI concentrations (p < 0.01).
- OP amplitudes decreased at 350 ppm and increased at 700 ppm TRI (p < 0.01).
- Electrophysiological changes correlated with blood TRI and trichloroethanol levels and were reversible post-exposure.
Conclusions:
- TRI exposure induces significant, reversible neuro-ophthalmotoxic effects in rabbits.
- Trichloroethanol appears to be the primary neurotoxic metabolite of TRI, influencing visual system function.