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PubMed2000

Comparative studies on pattern VECP between patients with ischemic optic neuropathy and optic neuritis.

PURPOSE: To evaluate whether and how VECPs are useful in differentiating ION from ON. METHODS: We retrospectively studied 27 patients with non-arteritic ION and 69 patients with ON using pattern visually evoked cortical potentials (PVECPs) to 3 rev/sec stimulation (transient) and 12 rev/sec stimulation (steady-state). RESULTS: In patients with ION, non-recordable responses were found in 25% of those with transient VECP and in 74% of those with steady-state VECP. In ON patients, non-recordable responses were found in 34% of those with transient VECP and in 64% of those with steady-state VECP. The average peak latency of P100 component in those with ION was significantly shorter than in those with ON. The amplitude ratio (affected eye/fellow eye) of steady-state VECP was significantly higher in those with ION than in those with ON. The amplitude ratio of P100 showed no significant differences between groups. CONCLUSION: The P100 peak latency of transient VECPs and the amplitude of steady-state VECPs have the potential to differentiate between ION and ON.

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