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Electroneurographic findings in patients with solvent induced central nervous system dysfunction
P Orbaek1, I Rosén, K Svensson
1Department of Occupational Medicine, Malmö General Hospital, Sweden.
British Journal of Industrial Medicine
|June 1, 1988
Summary
Solvent-exposed workers with chronic toxic encephalopathy showed no motor nerve differences initially, but later experienced decreased motor conduction velocity. Sensory nerve tests revealed axonal degeneration, with improvements over time.
Area of Science:
- Neuroscience
- Toxicology
- Occupational Health
Background:
- Solvent-induced chronic toxic encephalopathy (SICTE) is a neurological disorder.
- Peripheral nervous system (PNS) dysfunction is a potential consequence of chronic solvent exposure.
- Understanding the long-term effects of SICTE on the PNS is crucial for occupational health management.
Purpose of the Study:
- To evaluate the long-term functional changes in the peripheral nervous system of men diagnosed with SICTE.
- To compare neurophysiological findings between SICTE patients and unexposed controls.
- To assess the progression or recovery of PNS dysfunction over a follow-up period.
Main Methods:
- Neurography (motor and sensory fibers) was performed on 32 men with SICTE and 50 healthy male controls.
- Subjects were assessed at diagnosis and a subset of SICTE patients were re-examined after 22-72 months.
- Exclusion criteria included alcohol abuse and other neurological diseases; age was adjusted for comparison.
Main Results:
- No significant differences in motor nerve conduction velocity (MCV) were found between groups at baseline.
- A significant decrease in MCV was observed in SICTE patients at follow-up.
- Sensory nerve conduction studies showed reduced sensory nerve action potential (SNAP) amplitudes in median and sural nerves, indicating axonal degeneration, with some improvement during follow-up. Increased duration of SNAPs and a higher percentage of late components were noted in the exposed group. Warm-cold sensitivity tests also indicated sensory dysfunction.
Conclusions:
- While initial motor nerve function may appear normal, chronic toxic encephalopathy from solvent exposure can lead to progressive motor nerve dysfunction.
- Sensory nerve dysfunction, characterized by axonal degeneration, is present in SICTE patients and may show partial recovery over time.
- Peripheral nerve assessment is important for diagnosing and monitoring SICTE, with sensory disturbances being a key indicator.