Polyneuropathy induced by n-hexane intoxication in Taiwan

Area of Science:

• Neuroscience
• Toxicology
• Occupational Health

Background:

• n-Hexane and methyl n-butyl ketone share a neurotoxic metabolite, 2,5-hexanedione.
• Occupational exposure and recreational abuse of n-hexane can lead to significant neurotoxicity.

Purpose of the Study:

• To describe the neurotoxic effects of n-hexane exposure.
• To outline clinical manifestations, electrophysiological findings, and pathological hallmarks.
• To discuss prognosis and prevention strategies for n-hexane neurotoxicity.

Main Methods:

• Review of clinical manifestations and electrophysiological studies in n-hexane-exposed individuals.
• Pathological examination of affected nerve fibers.
• Analysis of exposure scenarios (occupational vs. recreational).

Main Results:

• n-Hexane exposure causes peripheral and central neurotoxicity, characterized by sensory impairment, weakness, and areflexia.
• Chronic low-dose exposure leads to axonal loss, while high-dose exposure causes axonal swelling and demyelination.
• Electrophysiology shows prolonged distal latencies and slowed nerve conduction velocities; pathology reveals giant axonal swelling and neurofilament accumulation.

Conclusions:

• n-Hexane neurotoxicity presents with distinct clinical and pathological features depending on dose and duration of exposure.
• Recovery is typically slow, and severe cases may result in long-term sequelae.
• Prevention through awareness, safer solvents, and adequate ventilation is crucial for industrial workers and glue sniffers.