Guillain-Barre Syndrome

Original Editor -Nitisha Sethi
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Introduction

Guillain-Barré syndrome (GBS) is a diverse group of autoimmune polyradiculopathies, involving sensory, motor, and autonomic nerves. It is the most common cause of quickly progressive flaccid paralysis. It is believed to be one of a number of related conditions, all sharing a similar underlying autoimmune abnormality, as a group known as anti-GQ1b IgG antibody syndrome.

Chronic inflammatory demyelinating polyneuropathy (CIDP) is considered the chronic counterpart to Guillain-Barré syndrome.

Aetiology

Most cases of GBS are preceded by upper respiratory tract infections or diarrhoea one to three weeks prior to their onset (usually caused by Campylobacter jejuni . Molecular imitation by the bacterial agents is thought to cause the autoimmunity with the development of anti-GQ1b IgG antibodies.

Alternative predisposing factors include recent surgery, lymphoma, and systemic lupus erythematosus (SLE).

Epidemiology 

• Incidence: The annual incidence of GBS in the USA is 1.2-3 per 100,000 inhabitants; GBS has been reported throughout the world. Most studies show annual incidence figures similar to those in the United States.
• Age: The annual mean rate of hospitalizations in the United States related to GBS increases with age, being 1.5 cases per 100,000 population in children under 15 years of age, and peaking at 8.6 cases per 100,000 population in 70-79 year olds
• Men are more likely to develop Guillain–Barré syndrome than women; the relative risk for men is 1.78 compared to women.

Pathophysiology

The pathophysiology of GBS is complex. GBS is considered to be an autoimmune disease triggered by a preceding bacterial or viral infection. Campylobacter jejuni, cytomegalovirus, Epstein-Barr virus and Mycoplasma pneumoniae are commonly identified antecedent pathogens.

The body's immune system begins to attack the body itself, The immune response causes a cross-reaction with the neural tissue. When myelin is destroyed, destruction is accompanied by inflammation. These acute inflammatory lesions are present within several days of the onset of symptoms. Nerve conduction is slowed and may be blocked completely. Even though the Schwann cells that produce myelin in the peripheral nervous system are destroyed, the axons are left intact in all but the most severe cases. After 2-3 weeks of demyelination, the Schwann cells begin to proliferate, inflammation subsides, and re-myelination begins.

Clinical Presentation

The typical patient with GBS presents 2-4 weeks following a relatively benign gastrointestinal or respiratory illness with complaints of finger dysesthesias and proximal muscle weakness of the lower limbs. The weakness may progress over hours to days to involve the arms, trunk, cranial nerves, and muscles of respiration.

Several subtypes exist including:

1. Acute inflammatory demyelinating polyradiculoneuropathy (AIDP): most common form (60-90%)
2. Axonal subtypes: acute motor axonal neuropathy (AMAN) (historically Chinese paralytic syndrome); acute motor-sensory axonal neuropathy (AMSAN)
3. Regional GBS syndromes: Miller Fisher variant (MFS/MFV), characterised by ataxia, ophthalmoplegia, and areflexia without weakness, anti-GQ1b antibodies are present in most cases; polyneuritis cranialis.
   

GBS Patterns

Symptoms Progression

Antecedent Illness: Up to two-thirds of patients with GBS report an antecedent illness or event 1-3 weeks prior to the onset of weakness. Upper respiratory and gastrointestinal illnesses are the most commonly reported conditions. Symptoms generally have resolved by the time the patient presents with the neurological condition. 

GBS Symptom progression: The mean time to the peak of symptoms is 12 days (from 1st neurological symptoms), with 98% of patients reaching a peak by 4 weeks. A plateau phase of persistent, unchanging symptoms then ensues, followed days later by gradual symptom improvement. Recovery usually begins 2-4 weeks after the progression ceases. The mean time to clinical recovery is 200 days.              

Differential Diagnosis

• Acute peripheral neuropathies
  • Toxic: thallium, arsenic, lead, n-hexane, organophosphate
  • Drugs: amiodarone, perhexiline, gold
  • Alcohol
  • Porphyria
  • Systemic vasculitis
  • Poliomyelitis
  • Diphtheria
  • Tick paralysis
  • Critical illness polyneuropathy

• Disorders of Neuromuscular Transmission
  • Botulism
  • Myasthenia gravis

• Central Nervous System Disorders
  • Basilar artery occlusion
  • Acute cervical transverse myelitis

Diagnostic Procedures

Guillain-Barre syndrome (GBS) is considered a clinical diagnosis and a diagnosis can be made at the bedside in most cases. For atypical cases or unusual subtypes, ancillary testing can be useful.

These include:

• Cerebrospinal fluid investigation: It will elevated at some stage of the illness but remains normal during the first 10 days. There may be lymphocytosis (> 50000000 cells/L).
• Electrophysiological studies: it includes nerve conduction studies and electromyography. They are normal in the early stages but show typical changes after a week or so with conduction block and multifocal motor slowing, sometimes most evident proximally as delayed F-waves.
  The only way to classify a patient as having the axonal or nonaxonal type is electrodiagnostically.
• Further investigative procedures can be undertaken to identify an underlying cause
  For example:
  • Chest X-ray , stool culture and appropriate immunological tests to rule out the presence of cytomegalovirus or mycoplasma
  • Antibodies to the ganglioside GQ1b for Miller Fisher Variant.
• MRI
• Lumbar Puncture: Most, but not all, patients with GBS have an elevated CSF protein level (>400 mg/L), with normal CSF cell counts. Elevated or rising protein levels on serial lumbar punctures and 10 or fewer mononuclear cells/mm3 strongly support the diagnosis.

Prognosis

Guillain-Barré syndrome can be a devastating disorder because of its sudden and unexpected onset. In addition, recovery is not necessarily quick. Typically improvement occurs after a number of weeks to months, although there is significant mortality (3-10%).

The majority of people recover completely or nearly completely. However, some have mild residual effects such as foot drops or abnormal feeling in the feet and hands for two years or more. Persistent fatigue and pain may be problematic. Fewer than 15 percent have a substantial long-term disability severe enough to need a cane, walker or wheelchair.

Category	Predictors
Clinical	Age >40 or 50 years Reduced vital capacity Need for mechanical ventilation Preceding diarrhea Low MRC Sum Score at admission Low MRC Sum Score at day 7 postadmission The short interval between weakness onset and admission Facial and/or bulbar weakness
Electrophysiological	Inexcitable nerves Low summated distal compound muscle action potential <20% of the lower limit of normal
Biological	None of definite value More confirmatory studies required

Management

There is no known cure for Guillain-Barré syndrome, but therapies that lessen the severity of the illness and accelerate the recovery in most patients exist. GBS is primarily managed with IV immunoglobulin or plasmapheresis along with supportive measures, which can hasten recovery.

Further Medical Management Can Be Done According to the Symptoms and the Complications

• Supportive Care
  • ICU monitoring
  • Basic medical management often determines mortality and morbidity.

• Ventilatory Support
  • Atelectasis leads to hypoxia.
  • Hypercarbia later finding; arterial blood gases may be misleading.
  • Vital capacity, tidal volume and negative inspiratory force are the best indicators of diaphragmatic function.
  • Progressive decline of these functions indicates an impending need or ventilatory assistance. Mechanical ventilation usually required if VC drops below about 14 ml/kg; ultimate risk depends on age, the presence of accompanying lung disease, aspiration risk, and assessment of respiratory muscle fatigue.
  • Atelectasis treated initially by incentive spirometry, frequent suctioning, and chest physiotherapy to mobilize secretions.
  • Intubation may be necessary for patients with substantial oro-pharyngeal dysfunction to prevent aspiration.
  • Tracheostomy may be needed in patients intubated for 2 weeks who do not show improvement.

• Autonomic Dysfunction
  • Autonomic dysfunction may be self-limited; do not over-treat.
  • Sustained hypertension managed by angiotensin-converting enzyme inhibitor or beta-blocking agent. Use short-acting intravenous medication for labile hypertension requiring immediate therapy.
  • Postural hypotension treated with fluid bolus or positioning.
  • Urinary difficulties may require intermittent catheterization.

• Nosocomial Infections Usually Involve Pulmonary and Urinary Tracts.
  • Occasionally central venous catheters become infected.
  • Antibiotic therapy should be reserved for those patients showing clinical infection rather than the colonization of fluid or sputum specimens.

• Venous Thrombosis Due to Immobilization Poses a Great Risk of Thromboembolism
  • Prophylactic use of subcutaneous heparin and compression stockings. 

Physiotherapy Management 

Aims of physiotherapy management are:

1. Regain the patient's independence with everyday tasks.
2. Retrain the normal movement patterns.
3. Improve patient's posture.
4. Improve the balance and coordination
5. Maintain clear airways
6. Prevent lung infection
7. Support joint in functional position to minimize damage or deformity
8. Prevention of pressure sores
9. Maintain peripheral circulation
10. Provide psychological support for the patient and relatives.

Respiratory Care

The common respiratory complications in the rehabilitation setting include incomplete respiratory recovery including chronic obstructive pulmonary disease, restrictive respiratory disease (pulmonary scarring, pneumonia), and tracheitis from chronic intubation and respiratory muscle insufficiency. Sleep hypercapnia and hypoxia, which worsens during sleep can be the result of a restrictive pulmonary function.

Treatment methods are:

• Nighttime saturation records with a pulse oximeter and bilevel positive airway pressure (BiPAP) may be indicated for the patients.
• Physical therapy measures (chest percussion, breathing exercises, resistive inspiratory training) may be required to clear respiratory secretions to reduce the work of breathing.
• Special weaning protocol to prevent over-fatigue of respiratory muscles can be recommended for more severe patients with tracheostomy. Patients with cranial nerve involvement need extra monitoring as they are more prone to respiratory dysfunction.
• Patients should be encouraged to cease smoking.
• Posturally drain areas of lung tissues, 2-hourly turning into supine or side-lying positions.
• 2-4 litre anesthetic bag can be used to enhance chest expansion. Therefore, 2 people are necessary for this technique, one to squeeze the bag and another to apply chest manipulation.
• Rib springing to stimulate cough.
• After the removal of a ventilator and adequate expansion, effective coughing must be taught to the patient.

Maintain Normal Range of Movement

Gentle passive movements through full ROM at least three times a day especially at the hip, shoulder, wrist, ankle, and feet.

Orthoses 

Use of light splints (eg. using PLASTAZOTE) may be required for the following purpose listed below:

• Support the peripheral joints in a comfortable and functional position during flaccid paralysis.
• To prevent abnormal movements.
• To stabilize patients using sandbags, and pillows.

Prevention of Pressure Sores

Change in patient's position from supine to side-lying after every 2 hours. If the sores have developed then UVR or ice cube massage to enhance healing.

Maintenance of Circulation

• Passive movements
• Effleurage massage to lower limbs.

Relief of Pain

• Transcutaneous electrical nerve stimulation
• Massage with passive ROM
• The patient can demonstrate increased sensitivity to light touch, a cradle can be used to keep the bedsheet away from the skin. Low-pressure wrapping or snug-fitting garments can provide a way to avoid light touch.
• Reassurance and explanation of what to expect can help in the alleviation of anxiety that could compound the pain.

Strength and Endurance training

Strengthening exercises can involve isometric, isotonic or isokinetic exercises, while endurance training involves progressively increasing the intensity and duration of functional activities such as walking or stair-climbing.

Functional training

Retraining of dressing, washing, bed mobility, transfers, and ambulation activities comprise a big part of the rehabilitation process. Balance and proprioception retraining in all these functional activities should also be included, while motor control can be achieved by doing Proprioceptive Neuromuscular Facilitation (PNF) techniques.

Research shows that high-intensity relative to lower intensity exercise significantly reduced disability in patients with GBS, as measured with the FIM (p<0.005, r=0.71). Overall, various types of exercise programmes improve physical outcomes such as functional mobility, cardiopulmonary function, isokinetic muscle strength, and work rate and reduce fatigue in patients with GBS.

Assistive devices

Assistive devices such as wheelchairs, walking sticks and quadrupeds should be made available to individuals if required in order to facilitate safe and effective ambulation.

According to Bensman (1970), the following four guidelines are to be followed for the prescription of exercises:

• Use short periods of non-fatiguing exercises matched to the patients strength.
• Progression of the exercise should be done only if the patient improves or if there is no deterioration in status after a week.
• Return the patient to bed rest if a decrease in muscle strength or function occurs.
• The objective should be directed not only at improving function but also at improving strength.

*A study of 35 patients (27 with classic GBS and 8 with acute motor axonal neuropathy [AMAN]), reported GBS-related deficits included: neuropathic pain requiring medication therapy (28 patients) *foot drop necessitating ankle-foot orthosis (AFO) use (21 patients) *locomotion difficulties requiring assistive devices (30 patients) *At 1-year follow-up, the authors found continued foot drop in 12 of the AFO patients. However, significant overall functional recovery had occurred within the general cohort (LoE 1B).

Nehal and Manisha (2015) suggest a functional goal-oriented multidisciplinary rehabilitation programme for daily 1 hour sessions for 12 weeks.

Additional Read

Case Study: Guillain-Barre Syndrome (Sub-Acute)