Classic Guillain-Barré syndrome

Area of Science:

• Neurology
• Immunology
• Pathology

Background:

• Classic Guillain-Barré syndrome is an acute, post-infectious, immune-mediated polyneuropathy.
• It encompasses both demyelinating and axonal forms, characterized by flaccid tetraparesis.

Purpose of the Study:

• To review recent nosological advances in Guillain-Barré syndrome.
• To highlight the importance of early pathological findings and diagnostic/prognostic scales.

Main Methods:

• Review of numerous nosological advances.
• Analysis of data from the International Guillain-Barré Outcome Study (IGOS) cohort (2000 patients).
• Emphasis on pathological substrate from autopsy, especially in the early phase (≤4 days).

Main Results:

• The International Guillain-Barré Outcome Study has facilitated the development of diagnostic and prognostic scales.
• Early-phase pathology (≤4 days) reveals inflammatory edema in proximal nerve trunks and spinal nerves as a fundamental lesion.
• Elevated serum axonal biomarkers are observed in both axonal and demyelinating forms, linked to this early inflammatory process.

Conclusions:

• Understanding early inflammatory edema offers new pathogenic, diagnostic, and therapeutic insights into Guillain-Barré syndrome.
• This finding helps explain the elevation of serum axonal biomarkers across different forms of the syndrome.
• Advances driven by large international studies are crucial for improving patient outcomes.