[Muscles and nerves in rheumatoid arthritis].

Area of Science:

• Rheumatology
• Neurology
• Pathology

Context:

• Rheumatoid arthritis (RA) is a chronic autoimmune disease.
• Neurological and muscular complications can occur in RA patients.
• Hospitalized RA cases may present with varying degrees of neuropathy.

Purpose:

• To systematically study neurological and muscular manifestations in hospitalized rheumatoid arthritis patients.
• To classify neuropathy based on electrophysiological findings.
• To correlate clinical and laboratory data with neuropathy severity.
• To examine muscle and nerve biopsies for histological, morphometric, and ultrastructural changes, focusing on capillary involvement.

Summary:

• A study of 37 hospitalized rheumatoid arthritis patients revealed discrete neurological and muscular signs.
• Electrophysiological examination enabled neuropathy classification by extent and intensity.
• Clinical and laboratory correlations identified a subgroup with severe neuropathy.
• Biopsies from 12 patients showed a high incidence of lesions and consistent capillary involvement.

Impact:

• Highlights the importance of electrophysiological assessment in diagnosing and classifying neuropathy in rheumatoid arthritis.
• Identifies specific patient subgroups at higher risk for severe neuropathy.
• Demonstrates the significant role of capillary damage in the pathophysiology of rheumatoid arthritis-associated neuropathy.
• Provides a basis for targeted therapeutic strategies for neurological complications in RA.