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Evoked response study among Malaysian multiple sclerosis patients
Abstract:
A study of visual evoked potential (VEP), brainstem evoked potential (BAEP) and median nerve somatosensory evoked potential (SSEP) in 26 Malaysian patients with clinically definite Multiple Sclerosis (MS). This study showed an overall high rate of abnormality, with 85% of patients for VEP, 31% for BAEP and 65% for median nerve SSEP. The rate of abnormality was particularly high for patients who were symptomatic, reaching 100% of patients for VEP, 50% of patients in BAEP, 83% of nerves for median nerve SSEP. The rate of abnormality among those who were asymptomatic was lower, varying from 32% of eyes in VEP, 27% of patients in BAEP and 31% of nerves in median nerve SSEP. Three out of 10 patients with optic spinal form of MS have abnormal BAEP. These show the usefulness of the evoked potential studies in confirming the clinical lesions as well as demonstrating subclinical involvement. The rate of abnormal evoked responses for the asymptomatic patients in this study is generally lower than that published elsewhere.
Insights
Evoked potential studies, including VEP, BAEP, and SSEP, revealed high abnormality rates in Malaysian Multiple Sclerosis patients. These tests are valuable for detecting both clinical and subclinical MS involvement.
Area of Science:
- Neuroscience
- Clinical Neurology
- Diagnostic Imaging
Background:
- Multiple Sclerosis (MS) is a chronic neurological disorder characterized by demyelination and axonal damage.
- Evoked potentials (EPs) are electrophysiological tests used to assess the integrity of sensory pathways in the central nervous system.
- EP abnormalities can indicate MS-related lesions, even in asymptomatic patients.
Purpose of the Study:
- To evaluate the utility of visual evoked potential (VEP), brainstem auditory evoked potential (BAEP), and median nerve somatosensory evoked potential (SSEP) in diagnosing Multiple Sclerosis (MS) in a Malaysian cohort.
- To determine the prevalence of EP abnormalities in symptomatic and asymptomatic MS patients.
- To compare EP abnormality rates in asymptomatic patients with previously published data.
Main Methods:
- A cohort of 26 Malaysian patients with clinically definite Multiple Sclerosis (MS) underwent VEP, BAEP, and median nerve SSEP testing.
- Abnormality rates were analyzed for the overall cohort, symptomatic patients, and asymptomatic patients.
- Specific attention was given to the optic spinal form of MS and BAEP findings.
Main Results:
- High overall abnormality rates were observed: 85% for VEP, 31% for BAEP, and 65% for median nerve SSEP.
- Symptomatic patients exhibited higher abnormality rates: 100% for VEP, 50% for BAEP, and 83% for median nerve SSEP.
- Asymptomatic patients showed lower, but significant, abnormality rates: 32% (VEP), 27% (BAEP), and 31% (SSEP).
Conclusions:
- Evoked potential studies are highly effective in confirming clinical MS lesions and detecting subclinical neurological involvement.
- The findings underscore the diagnostic value of VEP, BAEP, and SSEP in the comprehensive assessment of MS.
- The observed lower abnormality rates in asymptomatic patients compared to previous studies suggest potential differences in disease presentation or diagnostic criteria.