Somatosensory evoked potentials in adrenomyeloneuropathy

Area of Science:

• Neurology
• Genetics
• Metabolic Disorders

Background:

• Adrenomyeloneuropathy (AMN) is an X-linked metabolic disorder characterized by very-long-chain fatty acid accumulation.
• AMN leads to demyelination in the peripheral nerves, spinal cord, and cerebrum.
• Electrophysiological differences in AMN's impact on upper vs. lower limbs and peripheral vs. central nervous system (CNS) are not well-defined, especially between sexes.

Purpose of the Study:

• To electrophysiologically define patterns of nervous system demyelination in Adrenomyeloneuropathy (AMN).
• To differentiate the effects of AMN on peripheral versus central nervous system pathways in men and women.

Main Methods:

• Studied 83 patients with Adrenomyeloneuropathy (AMN).
• Utilized short latency median and posterior tibial nerve somatosensory evoked potentials (SSEPs) for electrophysiological assessment.
• Analyzed SSEP data to identify peripheral and central pathway involvement.

Main Results:

• Abnormal median SSEPs were observed in most women (10/16), predominantly involving central pathways.
• Most men (59/67) had abnormal median SSEPs affecting both peripheral and central pathways.
• Tibial SSEPs were frequently abnormal in both sexes (14/15 women, 67/67 men), with involvement of either peripheral or central pathways.

Conclusions:

• Adrenomyeloneuropathy (AMN) frequently causes widespread peripheral and central somatosensory pathway involvement in men.
• Women with Adrenomyeloneuropathy (AMN) predominantly show central nervous system pathway involvement.
• Electrophysiological findings highlight significant gender-based differences in AMN's neurological manifestations.