ACUTE IDIOPATHIC POLYNEURITIS (Guillain-Barré syndrome / GBS) — An acute, rapidly progressing autoimmune disorder of the peripheral nervous system characterized by muscle weakness, tingling, and a loss of reflexes.

Etiology (Causes): The condition is idiopathic (exact cause unknown), but it typically develops 1 to 3 weeks after a minor viral or bacterial infection (such as a respiratory or gastrointestinal illness). The body’s immune system mistakenly attacks its own nerves.
Pathogenesis: The immune response damages the myelin sheath (the protective covering of the nerves), leading to demyelination, which slows down or blocks nerve signals to the muscles.
Symptoms & Progression:
- Usually begins with tingling and weakness in the feet and legs, which progressively spreads upwards to the upper body and arms (ascending paralysis).
- In severe cases, it can affect the respiratory muscles, leading to life-threatening breathing difficulties that require a ventilator.
Diagnosis: Based on clinical examination, lumbar puncture (spinal tap showing elevated cerebrospinal fluid protein without an increase in cell count), and electromyography (EMG) to measure nerve activity.
Treatment: This is a medical emergency requiring hospitalization. Main treatments include plasmapheresis (plasma exchange) or intravenous immunoglobulin (IVIG) therapy to remove or block the destructive antibodies, alongside supportive care.

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