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Guillain-Barré Syndrome (GBS) is an acute autoimmune polyneuropathy that causes rapidly progressive weakness and paralysis, typically beginning in the lower extremities and ascending upward. It often follows infections and represents a medical emergency due to potential respiratory muscle involvement and autonomic dysfunction.
GBS results from molecular mimicry where antibodies produced against infectious agents cross-react with peripheral nerve components, particularly myelin sheaths and axons. This autoimmune attack leads to demyelination and axonal damage, disrupting nerve conduction and causing the characteristic ascending paralysis and sensory symptoms.
Diagnosis relies on the classic presentation of acute, symmetric, ascending weakness with areflexia, supported by cerebrospinal fluid analysis showing elevated protein with normal cell count (cytoalbuminous dissociation). Nerve conduction studies confirm demyelination patterns, while close monitoring for respiratory compromise and dysautonomia guides the need for intensive care and immunomodulatory therapy with IVIG or plasmapheresis.