Improved characterization of visual evoked potentials in multiple sclerosis by topographic analysis

Area of Science:

• Neuroscience
• Clinical Electrophysiology
• Neurology

Background:

• Evoked potentials (EP) correlate with multiple sclerosis (MS) disability and disease progression.
• Visual evoked potentials (VEP) are used to assess visual pathway integrity in MS.
• Conventional VEP analysis may lack sensitivity in detecting subtle abnormalities.

Purpose of the Study:

• To enhance the significance of visual evoked potentials (VEP) in multiple sclerosis (MS) using multichannel recordings and topographic analysis (tVEP).
• To compare the reliability, validity, and sensitivity of tVEP against conventional VEP (cVEP) analysis.

Main Methods:

• VEPs were recorded from 83 MS patients and 47 healthy controls (HC) using 204 electrodes.
• Topographic analysis (tVEP) involved defining components based on spatial similarity to HC reference maps.
• Measures of latency, amplitude, and configuration for the P100 component were derived from topographic maps.

Main Results:

• Topographic VEP (tVEP) showed improved sensitivity for MS diagnosis (72% vs. 60%) and history of optic neuritis (88% vs. 77%) compared to conventional VEP (cVEP).
• tVEP demonstrated a trend towards higher reliability for amplitude measurement.
• The advantages of tVEP were most evident in cases with ambiguous cVEPs.

Conclusions:

• Topographic VEP (tVEP) is a reliable, valid, and sensitive method for objectively quantifying visual pathway pathology in MS.
• tVEP offers enhanced diagnostic accuracy, particularly for subtle VEP abnormalities.
• Integrating tVEP with other EP modalities may improve MS disease course monitoring.