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Possible long term effects of chemical warfare using visual evoked potentials
Abbas Riazi1, Rhamatollah Hafezi2, Mahmoud Babaei1
1Department of Ophthalmology, School of Medicine, Baqiyatallah University of Medical Sciences, Tehran, Iran;
Iranian Journal of Medical Sciences
|September 23, 2014
Summary
Sulphur Mustard (SM) exposure did not significantly impact visual evoked potentials (VEPs) in chemical warfare victims. This study found no clear visual deficits or delayed effects on the visual cortex in exposed individuals compared to controls.
Area of Science:
- Neuroscience
- Ophthalmology
- Toxicology
Background:
- Occupational organic solvent exposure can affect visually evoked potentials (VEPs).
- The visual system is a known target for Sulphur Mustard (SM) toxicity.
- Iranian victims of SM exposure reported concerns about potential delayed visual effects.
Purpose of the Study:
- To investigate the delayed effects of Sulphur Mustard (SM) exposure on the visual system and visual cortex.
- To assess potential deficits in visually evoked potentials (VEPs) in individuals exposed to SM.
Main Methods:
- A study was conducted on 34 individuals with a history of chemical warfare (CW) exposure and 15 healthy controls.
- Visually evoked potentials (VEPs) were recorded using the Toennies electro-diagnosis device.
- Latencies of VEP components (N75, N140, P100) were analyzed and compared between groups.
Main Results:
- No significant differences were found in the mean latencies of N75, N140, and P100 between chemical warfare victims (VCWs) and the control group (P>0.05).
- Victims of chemical warfare (VCWs) reported no current visual symptoms.
- No clear deficits were observed in the visually evoked potentials (VEPs) of the exposed group.
Conclusions:
- Sulphur Mustard (SM) exposure, in this cohort, did not result in detectable abnormalities in visually evoked potentials (VEPs).
- The study suggests no significant delayed effect of SM exposure on the visual cortex or visual function as measured by VEPs.
- Further research may be warranted to explore long-term or subtle visual effects of SM exposure.
