An infection ends. A week or two later the immune system, still hunting the bug,
attacks something that looks like the bug — the myelin on your peripheral nerves. Weakness starts
in the feet and climbs. It is usually reversible, so the entire nursing job is keeping the patient
alive and un-harmed while it climbs, plateaus and retreats. The one thing that kills:
the paralysis reaching the diaphragm.
⬆️ ASCENDINGStarts in the LEGS and climbs. Symmetrical. Reflexes disappear.
🫁 AIRWAY FIRSTTrend vital capacity. Intubation kit at the bedside before you need it.
🦠 POST-INFECTIONGI or respiratory bug 1–3 weeks earlier — Campylobacter is the classic.
🔁 IT REVERSESRecovery runs top → down, the opposite way. Most people walk again.
🧬
THE NERVE & WHAT ATTACKS IT
STEP 1 · CAUSE
Guillain-Barré is an autoimmune attack on the insulation of the peripheral nerves — not the brain, not the cord.
🧬 Healthy nerve vs Guillain-Barré nerve
Myelin is insulation. It lets the impulse leap from node to node instead of crawling. Strip it and the signal slows, then blocks completely — the muscle never gets the message.
myelinaxon & nodesdestroyed myelin
🧠 Myelin = the plastic on the wire. Strip the plastic, the current leaks away.
📖 Definition in one line
An acute, autoimmune, inflammatory demyelinating polyneuropathy of the PERIPHERAL nervous system.
Acute — hours to days, not years
Autoimmune — your own antibodies
Demyelinating — the sheath, not the wire
Polyneuropathy — many nerves, both sides, symmetrical
🧠 A-I-D-P — the formal name (acute inflammatory demyelinating polyradiculoneuropathy) is the definition read aloud.
🦠 It follows an infection
60–70% of patients had an infection 1–3 weeks before the weakness started. Always ask: “Were you sick recently?”
Campylobacter jejuni — the classic; undercooked poultry, gastroenteritis
Respiratory viruses / influenza-like illness
CMV, Epstein-Barr, Mycoplasma
Occasionally after surgery or vaccination (rare)
🧠 “The bug is long gone — the antibodies stayed.” The diarrhea has stopped by the time the legs give out.
🎭 Molecular mimicry — the actual mechanism
The immune system is not broken; it is fooled. The sugar coat on Campylobacter looks almost identical to gangliosides sitting on human myelin, so the antibodies built to kill the bug also fit the nerve.
🧠 Mistaken identity. The immune system arrests the nerve because it is wearing the same coat as the criminal.
⭐ Peripheral, NOT central
This is the single most useful sorting question on an exam.
GBS → peripheral nerves & roots → Schwann cells
MS → brain & spinal cord → oligodendrocytes
Because Schwann cells can rebuild myelin, GBS is usually reversible. CNS scars in MS are not.
🧠 S for Schwann, S for Surface — GBS is on the OUTSIDE.
🧠 GBS vs MS — where the myelin dies
Guillain-Barré (NG-245)
Multiple sclerosis (NG-253)
Peripheral nerves & roots
Central — brain, cord, optic nerve
Schwann cell myelin
Oligodendrocyte myelin
One acute episode, ascending, symmetrical
Relapsing/remitting, scattered, asymmetrical
Reflexes absent
Reflexes often brisk (upper motor neuron)
Usually recovers
Chronic, progressive disability
Peak danger = respiratory failure
Peak danger = accumulating disability
🧠 GBS = Gets Better Slowly. MS = More Scars.
🧪 The lab fingerprint
Lumbar puncture shows albuminocytologic dissociation — high protein with a normal cell count.
It usually takes 1–2 weeks to appear, so an early normal LP does not rule GBS out.
Nerve conduction studies show slowed conduction / conduction block — the picture in the top diagram.
🧠 “Protein up, cells calm.” Lots of debris, no infection — that is why it is not meningitis.
❌ What GBS is NOT
Not a stroke — a stroke is sudden and one-sided; GBS is symmetrical.
Not contagious — you cannot catch GBS from the patient.
Not primarily a sensory disease — but paraesthesia and pain are common and under-treated.
Not a loss of consciousness — the patient is awake and aware the whole time.
Never assume a fully paralyzed GBS patient cannot hear you.
🧠 Locked in, listening. Talk to them, explain everything, set up a blink/eye code.
⬆️
ASCENDING — READ THE PATTERN
STEP 2 · CLUES
Symmetrical, ascending, areflexic. If it starts at the top or only on one side, think again.
⬆️ Which way is it moving? (and which way does it come back?)
The direction is the exam question. Weakness climbs: feet → legs → hips → trunk → diaphragm → arms → face and swallowing. Recovery runs the film backwards — head and arms first, feet last.
🧠 “GROUND-up Barré.” It starts on the ground and climbs. Recovery falls back down.
⭐ The classic triad
1. Ascending weakness — legs first
2. Symmetrical — both sides equally
3. Areflexia — deep tendon reflexes absent or markedly reduced
All three together in a patient who was well last month is GBS until proven otherwise.
🧠 A-S-A: Ascending, Symmetrical, Areflexic.
🔨 Why the knee-jerk vanishes
A reflex needs an intact loop: sensory nerve in, cord, motor nerve out. Demyelination anywhere on that loop breaks it. Absent reflexes with normal consciousness is a very strong GBS clue.
🧠 Broken loop = no kick. Check reflexes on every shift and chart the level.
🦶 First complaints you will actually hear
“My feet feel like pins and needles / like they are asleep”
“My legs are heavy — I keep tripping on the stairs”
“I can't get out of the chair without pushing”
Deep aching pain in the back and thighs, worse at night
Sensory tingling often arrives before the weakness.
🧠 Tingle → trip → can't stand → can't breathe. That is the whole timeline in four steps.
🚨 Signs it has reached the danger zone
These are the early respiratory failure signs — long before the sats drop.
Can't cough — a weak, wet, ineffective cough NCLEX TIP
Can't lift the head off the pillowNCLEX TIP
Can't raise the eyebrows / weak facial movement
Shallow, rapid, abdominal breathing; talking in short phrases
Restlessness and anxiety — the earliest hypoxia sign
Never wait for a falling SpO₂ — by then the reserve is gone.
🧠 HEAD + COUGH. If they cannot lift their head or cough, the diaphragm is next.
🚨 “Which patient do I see first?” — the answer pattern
SEE FIRSTGBS patient who cannot lift their head off the pillow, or whose cough has gone weak.
SEE FIRSTGBS patient with a falling vital capacity even if the SpO₂ is 97%.
can waitGBS patient with new leg numbness and tingling.
can waitGBS patient asking for pain medication for aching thighs.
Every priority question on this topic is really the question: has the paralysis reached the muscles of breathing?
🧠 Airway beats everything. Numbness is not an emergency. A weak cough is.
😐 Cranial nerve involvement
When it climbs high enough it takes the cranial nerves too:
Facial weakness — often both sides (unlike Bell's palsy, which is one side)
Dysphagia — aspiration risk; swallow screen before anything by mouth
Dysarthria — slurred, breathy speech
Eye movement problems in some variants
SEE ALSONG-237 — one-sided facial droop is a different problem.
🧠 Bilateral face = think GBS. One-sided face = think Bell's or stroke.
📈 Autonomic instability
The autonomic nerves are peripheral nerves too — so they get demyelinated as well. This is what causes sudden deaths in patients whose breathing was fine.
🧠 The thermostat is broken. Expect swings, and never over-treat a single reading.
📉 What the monitor shows
Move these patients slowly, pre-oxygenate before suctioning (suction can trigger a vagal bradycardia), and treat blood pressure swings cautiously — the next swing may go the other way.
🧠 Don't chase the number, watch the pattern. Aggressive treatment of one high BP can drop them into the floor five minutes later.
🚨
THE AIRWAY IS THE PRIORITY
STEP 3 · EMERGENCY
Everything else on this page can wait. This cannot.
🫁 When the paralysis reaches the diaphragm
Roughly 1 in 3 patients with GBS need mechanical ventilation at some point. The nursing job is to spot the slide before it becomes a crash intubation.
🧠 C3, 4, 5 keep the diaphragm alive. When the wave reaches the neck, the breathing goes.
🚨 Priority nursing action
Prepare for mechanical ventilation. For a worsening GBS patient the correct answer is almost always airway readiness, not comfort or mobility.
Intubation setup AT THE BEDSIDE — not down the hall
Ventilator available; notify respiratory therapy early
Suction set up and working
Bag-valve-mask with oxygen at the head of the bed
Consider a higher level of care before the crisis
🧠 Set it up while they can still talk to you.
🧪 Numbers that decide
Vital capacity and negative inspiratory force are the bedside tests — they fall long before the pulse oximeter reacts.
Normal VC ≈ 65–75 mL/kg
Commonly taught worry threshold: VC < 20 mL/kg
NIF weaker (less negative) than −30 cmH₂O
Maximal expiratory pressure < 40 cmH₂O
Thresholds vary between facilities — follow your unit protocol; the trend matters more than one value.
🧠 20 / 30 / 40. VC under 20, NIF under 30, MEP under 40 → prepare to intubate.
❌ Oxygen is not the fix
This is pump failure, not gas-exchange failure. The lungs are fine — the muscle driving them is not.
Oxygen will keep the saturation looking normal while the CO₂ climbs and the patient tires out. Never let a normal SpO₂ reassure you in GBS.
🧠 Good sats, bad breathing. Trust the vital capacity, not the oximeter.
✅ Positioning & feeding safety
Head of bed up — 30–45° unless contraindicated
NPO until a swallow screen is passed; involve speech therapy early
Suction within reach at all times
Chest physiotherapy / incentive spirometry while they still can
Reposition slowly — sudden movement can drop the blood pressure
🧠 Up, screened, suction ready.
🗣️ Communication when they cannot speak
A ventilated GBS patient may be fully alert with no way to move. Set up a communication method before they lose the ability.
Agree a blink code early: one blink = yes, two = no
Letter board or eye-gaze board at the bedside
Call bell they can actually activate — ask what still works
Orient, explain and warn before every touch
🧠 Plan the code on day one. By day four there may be no way to negotiate one.
💉
TREATMENT & DAILY NURSING CARE
STEP 4 · CARE
Two disease-modifying options, and a long list of things that go wrong if nobody prevents them.
💉 Plasmapheresis — take the antibodies out
Plasma exchange physically removes the circulating antibodies that are eating the myelin. Most effective when started early — within the first couple of weeks of symptoms.
Needs large-bore vascular access — monitor the site
Watch for hypotension during and after treatment
Watch for hypocalcemia from citrate anticoagulant — tingling around the mouth, tetany, positive Chvostek / Trousseau
Clotting factors are removed too → bleeding risk; check for bruising and oozing
Infection risk from the line
🧠 Wash the blood. The antibodies go in the bin; the cells come home.
💊 IVIG — flood the system instead
High-dose intravenous immunoglobulin gives the immune system so much borrowed antibody that it stops attacking the nerve. Equally effective as plasmapheresis; often easier to give.
Check renal function before giving — IVIG carries a renal risk
Hydrate and infuse at the ordered rate — do not speed it up
Watch for headache, flushing, chills, fever, myalgia during infusion
Risk of thrombosis and, rarely, aseptic meningitis
Check for IgA deficiency before the first dose (anaphylaxis risk)
🧠 IVIG = “I.V. In place of Getting washed.” Same goal, different route.
⚖️ Plasmapheresis vs IVIG
Plasmapheresis
IVIG
Removes antibodies
Dilutes / neutralizes them
Needs a large-bore line + machine
Peripheral IV is often enough
Hypotension, hypocalcemia, bleeding
Renal impairment, headache, thrombosis
Removes clotting factors and drugs
Does not remove anything
Equally effective — do NOT combine them routinely
🧠 Take it out (PLEX) or drown it out (IVIG) — pick one.
❌ Steroids are not the answer here
Unlike an MS relapse, corticosteroids alone are not recommended for Guillain-Barré — they have not been shown to improve the outcome.
That contrast is worth memorizing because it catches people out.
🧠 MS relapse → steroids. GBS → PLEX or IVIG.
🩸 VTE prevention is not optional
A paralyzed, immobile patient is a clot waiting to happen — and a pulmonary embolus in someone with a vital capacity of 15 mL/kg is catastrophic.
Eyes — if the face is weak, lubricate and protect (they may not blink fully)
Bowel — ileus is common; listen, and use a bowel regimen
Bladder — retention is common; bladder scan rather than assume
Nutrition — high energy needs; enteral feeding if swallowing is unsafe
🧠 Everything that touches the bed will break if you don't move it.
💊 Pain is real and often missed
Deep, aching, neuropathic pain in the back and legs affects most patients and is worse at night. A patient who cannot move may not be able to show you pain.
Use a scale they can answer — blinks, eye gaze, a pain thermometer
Neuropathic agents (e.g. gabapentin) are commonly used
Repositioning, warmth and massage help
Watch autonomic responses — a BP or HR spike may be the only pain signal
🧠 Silent does not mean comfortable.
🧯 Preventing the complications that actually kill
🫁Respiratory failure#1 cause of death
🦠Pneumoniaaspiration + weak cough
🩸PE / DVTimmobility
💔Arrhythmiaautonomic
🛌Pressure injuryimmobility
😞Depressionlong ICU stay
🧠 They rarely die of the nerve disease — they die of what immobility does to them.
🏥
RECOVERY & WHAT TO TELL THEM
STEP 5 · TEACH
This is one of the few devastating neuro diagnoses with a genuinely hopeful answer.
✅ The honest prognosis
Symptoms usually progress for up to ~4 weeks, then plateau
Plateau lasts days to weeks
Recovery takes weeks to months, sometimes 1–2 years
The majority regain the ability to walk
A minority are left with residual weakness, numbness or fatigue
Recurrence is uncommon
🧠 Up fast, down slow. It arrives in days and leaves over months.
🔁 Recovery goes the OTHER way
Strength comes back descending — head and shoulders first, feet last. Tell the patient this on day one so that regaining a smile before regaining a step feels like progress, not failure.
🧠 Last in, first out. The last muscles to be paralyzed are the first to recover.
💪 Rehab is the long game
Physiotherapy and occupational therapy from the ICU onward
Pace activity — fatigue is the most persistent leftover symptom
Assistive devices, home modification, driving reassessment
Return to work is often gradual and part-time first
Psychological support — ICU delirium and PTSD are common after this illness
🧠 The muscles come back before the stamina does.
📞 Call the provider for…
Any new difficulty breathing, or a weak/ineffective cough
Difficulty swallowing, choking or a wet voice
Fainting, palpitations or big blood pressure swings
New weakness after starting to improve
Fever or signs of infection
🧠 Breathe, swallow, faint. Three words to send home with the family.
🧠 The five things students get wrong
Trap 1Calling it a CNS disease. It is peripheral.
Trap 2Saying it descends. GBS ascends; myasthenia gravis descends.
Trap 3Reassured by a normal SpO₂. Trend the vital capacity.
Trap 4Giving steroids as the main treatment. It is PLEX or IVIG.
Trap 5Assuming the patient is unconscious. They are awake.