Beriberi neuropathy. Morphometric study of sural nerve

Area of Science:

• Neurology
• Neuroscience
• Pathology

Background:

• Beriberi, a condition caused by thiamine (vitamin B1) deficiency, can lead to neurological complications.
• Understanding the specific nerve fiber involvement in beriberi is crucial for diagnosis and treatment.

Observation:

• Morphometric analysis of sural nerve biopsies from beriberi patients was performed.
• Teased fiber analysis revealed significant axonal degeneration (37.5%) and segmental demyelination (5.3%).

Findings:

• Segmental demyelination appeared secondary to axonal degeneration in some cases.
• Electromyography and slow muscle weakness improvement supported axonal degeneration of motor fibers.
• A preferential decrease in large myelinated nerve fibers was observed, with small myelinated and unmyelinated fibers preserved.

Implications:

• The findings suggest a primary axonal pathology in beriberi neuropathy.
• The lack of lower limb pain contradicts some theories on nerve pain mechanisms.
• This research aids in understanding the neuropathological basis of beriberi.