Delayed P100-Like Latencies in Multiple Sclerosis: A Preliminary Investigation Using Visual Evoked Spread Spectrum...

Area of Science:

• Neuroscience
• Ophthalmology
• Clinical Electrophysiology

Background:

• Optic nerve conduction is frequently impaired in multiple sclerosis (MS).
• Visual Evoked Potential (VEP) P100 latency is a standard measure, but Visual Evoked Spread Spectrum Analysis (VESPA) offers improved signal-to-noise ratio.
• VESPA may provide enhanced sensitivity for detecting subtle visual pathway changes in MS.

Purpose of the Study:

• To investigate the utility of VESPA for assessing and monitoring visual dysfunction in MS.
• To compare P100-like VESPA component latencies and amplitudes between MS patients and healthy controls.
• To examine the longitudinal reproducibility of VESPA in MS over a 3-year period.

Main Methods:

• The study involved 43 MS patients (relapsing-remitting and secondary-progressive subtypes) and 42 healthy controls.
• Participants underwent VESPA testing at baseline, with follow-ups at 12 and 24 months.
• P100-like VESPA component latencies and amplitudes were analyzed and compared across groups and over time.

Main Results:

• P100-like VESPA latencies were significantly delayed in MS patients compared to controls over 24 months.
• Secondary-progressive MS patients exhibited the most pronounced latency delays.
• No significant longitudinal changes in P100-like VESPA responses were observed within the study period.

Conclusions:

• VESPA is a reproducible electrophysiological technique for evaluating visual pathway function.
• The findings support the potential of VESPA as a sensitive tool for assessing visual dysfunction in multiple sclerosis.
• VESPA may be particularly useful for differentiating disease severity and progression in MS subtypes.