[Relation of optic myelitis (OM) and multiple sclerosis (MS)]

Area of Science:

• Neuroscience
• Clinical Neurology
• Auditory Evoked Potentials

Context:

• Optic neuritis (ON) and myelopathy are neurological conditions affecting the central nervous system.
• Brainstem auditory evoked potentials (BAEP) are used to assess auditory pathway function.
• Previous studies have explored VEP in these conditions, but BAEP findings require further elucidation.

Purpose:

• To investigate the utility of BAEP in diagnosing optic neuritis (ON) and myelopathy.
• To characterize BAEP abnormalities in patients with ON and myelopathy.
• To explore the relationship between BAEP findings and the underlying pathology, particularly in relation to multiple sclerosis (MS).

Summary:

• BAEP were abnormal in 42% of optic neuritis patients and 38% of myelopathy patients.
• Common abnormalities included V wave issues (82%) and interpeak latency prolongation (32%).
• Lesions were often unilateral (59%), suggesting small, localized white matter involvement consistent with MS pathology. Nearly half of the abnormal BAEP indicated brainstem lesions.

Impact:

• Suggests that optic neuritis may be a clinical variant of multiple sclerosis, not a distinct disease.
• Highlights the potential of BAEP as a diagnostic tool for detecting brainstem involvement in ON and myelopathy.
• Provides insights into the neurophysiological underpinnings of these neurological disorders, aiding in differential diagnosis and understanding disease mechanisms.