Lumbosacral spinal evoked potentials in patients with multiple sclerosis

Area of Science:

• Neurophysiology
• Clinical Neurology
• Biomedical Engineering

Background:

• Multiple Sclerosis (MS) is a demyelinating disease affecting the central nervous system.
• Spasticity is a common and often debilitating symptom in MS patients.
• Electrophysiological assessments are crucial for understanding neurological dysfunction.

Purpose of the Study:

• To investigate lumbosacral spinal evoked potentials (SEPs) in MS patients with spinal symptoms.
• To identify electrophysiological markers correlating with clinical features, particularly spasticity.
• To evaluate the P2/S ratio as a potential measure of spasticity in MS.

Main Methods:

• Percutaneous recording of lumbosacral SEPs in 22 MS patients and 24 healthy controls.
• Analysis of wave latencies, durations, and areas (R, A at S1; S, P2 at Th12).
• Correlation analysis between SEP parameters and clinical features, including spasticity intensity.

Main Results:

• A significant reduction in the P2/S ratio was observed in the MS group compared to controls.
• The reduction in the P2/S ratio strongly correlated with the intensity of spasticity.
• No significant correlation was found between the P2/S ratio and other clinical features of MS.

Conclusions:

• The P2/S ratio derived from lumbosacral SEPs is a promising electrophysiological marker.
• This ratio shows a strong correlation with spasticity severity in multiple sclerosis patients.
• The P2/S ratio may serve as a valuable tool for objectively measuring spasticity in MS.