Saccade dysfunction associated with chronic petrol sniffing and lead encephalopathy

Area of Science:

• Neuroscience
• Toxicology
• Neurology

Background:

• Chronic petrol sniffing, especially with leaded petrol, can cause lead encephalopathy, a severe neurological condition.
• Neurological damage affects the brain's cortex, basal ganglia, cerebellum, and brain stem.

Purpose of the Study:

• To investigate central nervous system (CNS) changes in chronic petrol sniffers using saccadic eye movement tasks.
• To differentiate between changes from petrol sniffing and lead encephalopathy.
• To assess the reversibility of these neurological changes.

Main Methods:

• Saccade function was evaluated in four groups: encephalopathic sniffers, chronic sniffers, ex-sniffers, and non-sniffers.
• Saccadic eye movements, including visually guided saccades and antisaccades, were analyzed.

Main Results:

• Chronic sniffers exhibited delayed saccades and increased errors, indicating cortical and basal ganglia dysfunction.
• These deficits resolved in ex-sniffers, suggesting partial recovery.
• Encephalopathic sniffers showed more severe dysfunction with additional signs of cerebellar and brain stem impairment.

Conclusions:

• Petrol abuse is linked to reversible cortical and basal ganglia abnormalities.
• Lead encephalopathy from petrol sniffing results in persistent cerebellar and brain stem damage.