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Visual evoked potentials study in chronic idiopathic inflammatory demyelinating polyneuropathy
T Stojkovic1, J de Seze, J F Hurtevent
1Department of Neurology, University of Lille, Lille, Cedex, France. t-stojkovic@chru-lille.fr
Summary
Abnormal visual evoked potentials (VEPs) are common in chronic inflammatory demyelinating polyneuropathy (CIDP) but poorly correlate with central nervous system lesions or glycolipid antibodies. This suggests immune-mediated damage affects both peripheral nerves and optic nerves in CIDP.
Area of Science:
- Neurology
- Neuroimmunology
- Clinical Neuroscience
Background:
- Chronic inflammatory demyelinating polyneuropathy (CIDP) is often associated with central nervous system (CNS) demyelination, a link frequently underestimated.
- Investigating the co-occurrence of central and peripheral demyelination in CIDP is crucial for understanding disease mechanisms.
Purpose of the Study:
- To determine the frequency of combined central and peripheral demyelination in CIDP patients.
- To correlate visual evoked potential (VEP) abnormalities with CNS demyelinating lesions on brain MRI and the presence of anti-glycolipid antibodies.
Main Methods:
- Prospective study of 17 CIDP patients using nerve conduction studies, brain MRI, and anti-glycolipid antibody testing.
- VEPs were performed before and after 6 months of treatment with intravenous immunoglobulin (IVIG) or steroids.
Main Results:
- 47% of patients exhibited abnormal VEPs (increased latency or interocular latency difference).
- 23% of patients showed CNS demyelinating lesions on brain MRI; 3 of these had prolonged VEP latency.
- VEP abnormalities showed poor correlation with CNS lesions and anti-glycolipid antibodies (including anti-GM1, SGLPG, anti-sulfatides).
Conclusions:
- Abnormal VEPs are frequent in CIDP patients.
- VEP abnormalities in CIDP patients are poorly correlated with CNS demyelinating lesions and anti-glycolipid antibodies.
- Immune-mediated damage affecting both the peripheral nervous system and optic nerve likely explains VEP abnormalities in CIDP.