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Guillain Barr Syndrome

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In one line

·After an infection, the immune system attacks the myelin (the fatty wrap that insulates nerves), causing weakness that climbs from the feet upward and knocks out reflexes.

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Normal physiology

·Peripheral nerves are long cables that carry electrical signals from the brain and spinal cord to every muscle and sensory spot in the body. Each nerve fiber is wrapped in myelin—a fatty insulation—so signals travel fast and clear, like a good wire coating. The immune system patrols for germs but normally leaves the body's own tissues alone.

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What goes wrong

·After an infection, the immune system gets confused and attacks the myelin (the fatty insulation around nerve fibers), stripping it away. The longest nerves—those running to the feet—are hit first, so weakness and numbness start there and climb upward.

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Hallmark signs

·Weakness that starts in the legs and climbs up
·Tingling or numbness in the hands and feet
·Trouble walking or standing
·Loss of reflexes (like the knee-jerk reflex)
·Pain in the back, legs, or muscles
·Trouble breathing or swallowing
·Fast or uneven heart rate, or blood pressure swings
·Recent infection one to four weeks before weakness started

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Red flags · escalate now

·Trouble breathing, shortness of breath, or feeling like you cannot take a deep breath
·Trouble swallowing, drooling, or choking on food or water
·Weakness spreading to the chest, neck, or face within hours
·Heart racing, slowing, or skipping beats; blood pressure swinging high and low
·Cannot stand or walk at all, or weakness has reached both arms

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Workup

·Lumbar puncture (spinal tap) with cerebrospinal fluid (CSF) analysis
·Nerve conduction studies (NCS) and electromyography (EMG)
·Forced vital capacity (FVC) at bedside
·Negative inspiratory force (NIF) measurement
·Anti-ganglioside antibodies (anti-GM1, anti-GD1a, anti-GQ1b) in serum
·Stool culture or PCR for Campylobacter jejuni, serology for recent infections
·Continuous cardiac telemetry and autonomic function monitoring

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Treatment

·Intravenous immunoglobulin (IVIG) 2 g/kg divided over 5 days OR plasma exchange (5 exchanges over 10–14 days)
·Intubation and mechanical ventilation if FVC < 20 mL/kg, NIF worse than –20 cm H₂O, or signs of respiratory fatigue
·DVT prevention (prophylaxis) with sequential compression devices or subcutaneous heparin/enoxaparin
·Pain control with gabapentin 300–900 mg three times daily or pregabalin 75–150 mg twice daily
·Continuous cardiac telemetry and autonomic support (IV fluids, atropine for a slow heart rate (bradycardia), short-acting pressors like phenylephrine for low blood pressure (hypotension))
·Early physical and occupational therapy once the acute phase stabilizes

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NCLEX trap

·The infection is gone. Guillain-Barré is not an active infection — it's the immune system overreacting AFTER the infection has cleared. Antibiotics won't help. The real treatment is IVIG (concentrated antibodies from donated blood that calm the immune attack) or plasmapheresis (a machine that filters out the harmful antibodies from the blood).
·Steroids don't work for Guillain-Barré and can actually make it worse. The proven treatments are IVIG or plasmapheresis. Both stop the immune system from attacking the myelin (the protective coating around nerves). Steroids are the wrong tool here.
·The weakness is the danger. The tingling is just noise. Watch the strength and the breathing muscles — not the strange sensations. Even if the person feels okay but can't move their legs or take a deep breath, they still need close monitoring and possibly a breathing tube.
·Without IVIG or plasmapheresis, Guillain-Barré keeps climbing. The person can go from walking to needing a ventilator in hours or days. Treat it now — the earlier you start, the less damage the immune system can do.
·Intubate before the breathing gets bad. Guillain-Barré is sneaky — the diaphragm (the main breathing muscle under the lungs) weakens fast. Put the tube in when vital capacity (a breathing test that measures how much air the lungs can move) drops below 20 mL/kg, or when the person can't swallow or cough well — not when they're gasping for air.
·Guillain-Barré can attack the autonomic nerves (the nerves that run the body's background systems like heart rate and blood pressure). Watch for wild swings — heart racing then slowing, blood pressure spiking then dropping. These are emergency signs and need ICU-level care with close monitoring and sometimes medicines to steady the heart and blood vessels.

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