Guillain–Barré syndrome

Guillain–Barré syndrome
Specialty	Neurology

Guillain-Barré syndrome (GBS) (French pronunciation: [ɡiˈlɛ̃ baˈʁe]; in English, Template:Pron-en, /ɡiːˈlæn bəˈreɪ/, etc.) is an acute inflammatory demyelinating polyneuropathy (AIDP), an autoimmune disorder affecting the peripheral nervous system, usually triggered by an acute infectious process. It is included in the wider group of peripheral neuropathies. There are several types of GBS, but unless otherwise stated, GBS refers to the most common form, AIDP. GBS is rare and has an incidence of 1 or 2 people per 100,000. It is frequently severe and usually exhibits as an ascending paralysis noted by weakness in the legs that spreads to the upper limbs and the face along with complete loss of deep tendon reflexes. With prompt treatment by plasmapheresis or intravenous immunoglobulins and supportive care, the majority of patients will regain full functional capacity. However, death may occur if severe pulmonary complications and autonomic nervous system problems are present. Guillain-Barre is one of the leading causes of non-trauma-induced paralysis in the world.

Pathophysiology

All forms of Guillain-Barré syndrome are due to an immune response to foreign antigens (such as infectious agents) that are mistargeted at host nerve tissues instead. The targets of such immune attack are thought to be gangliosides, compounds naturally present in large quantities in human nerve tissues. The most common antecedent infection is the bacteria Campylobacter jejuni. However, 60% of cases do not have a known cause.

The end result of such autoimmune attack on the peripheral nerves is damage to the myelin, the fatty insulating layer of the nerve, and a nerve conduction block, leading to a muscle paralysis that may be accompanied by sensory or autonomic disturbances.

However, in mild cases, nerve axon (the long slender conducting portion of a nerve) function remains intact and recovery can be rapid if remyelination occurs. In severe cases, axonal damage occurs, and recovery depends on the regeneration of this important tissue. Recent studies on the disorder have demonstrated that approximately 80% of the patients have myelin loss, whereas, in the remaining 20%, the pathologic hallmark of the disorder is indeed axon loss.

GBS may be a rare side-effect of influenza vaccines, with an incidence of about one case per million vaccinations. Other estimates suggest the incidence of GBS among those receiving the vaccine was one case per 105,000 and that the GBS was not directly due to the vaccine but to a bacterial contamination of the vaccine that triggered GBS.

There were reports of GBS affecting some people who had received swine flu immunizations in the 1976 U.S. outbreak of swine flu. Overall, there were about 500 cases of GBS—25 of which resulted in death from severe pulmonary complications— which, according to Dr. P. Haber, were probably caused by an immunopathological reaction to the 1976 swine flu vaccine. Other influenza vaccines have not been linked to GBS, though caution is advised for certain individuals, particularly those with a history of GBS.

Guillain-Barre, unlike disorders such as multiple sclerosis and Lou Gehrig`s disease (ALS), is a peripheral nerve disorder and does not generally cause nerve damage to the brain or spinal cord.

Signs and symptoms

The disorder is characterized by symmetrical weakness which usually affects the lower limbs first, and rapidly progresses in an ascending fashion. Patients generally notice weakness in their legs, manifesting as "rubbery legs" or legs that tend to buckle, with or without dysesthesias (numbness or tingling). As the weakness progresses upward, usually over periods of hours to days, the arms and facial muscles also become affected. Frequently, the lower cranial nerves may be affected, leading to bulbar weakness, (oropharyngeal dysphagia, that is difficulty with swallowing, drooling, and/or maintaining an open airway) and respiratory difficulties. Most patients require hospitalization and about 30% require ventilatory assistance. Facial weakness is also commonly a feature, but eye movement abnormalities are not commonly seen in ascending GBS, but are a prominent feature in the Miller-Fisher variant (see below.) Sensory loss, if present, usually takes the form of loss of proprioception (position sense) and areflexia (complete loss of deep tendon reflexes), an important feature of GBS. Loss of pain and temperature sensation is usually mild. In fact, pain is a common symptom in GBS, presenting as deep aching pain, usually in the weakened muscles, which patients compare to the pain from overexercising. These pains are self-limited and should be treated with standard analgesics. Bladder dysfunction may occur in severe cases but should be transient. If severe, spinal cord disorder should be suspected.

Fever should not be present, and if it is, another cause should be suspected.

In severe cases of GBS, loss of autonomic function is common, manifesting as wide fluctuations in blood pressure, orthostatic hypotension, and cardiac arrhythmias.

Acute paralysis in Guillain-Barre syndrome may be related to sodium channel blocking factor in the cerebrospinal fluid (CSF). Significant issues involving intravenous salt and water administration may occur unpredictably in this patient group, resulting in SIADH.

The symptoms are similar to those for progressive inflammatory neuropathy.

Clinical variants

Six different subtypes of Guillain-Barre syndrome (GBS) exist:

• Acute inflammatory demyelinating polyneuropathy (AIDP) is the most common form of GBS, and the term is often used synonymously with GBS. It is caused by an auto-immune response directed against Schwann cell membranes.

• Miller–Fisher syndrome (MFS) is a rare variant of GBS and manifests as a descending paralysis, proceeding in the reverse order of the more common form of GBS. It usually affects the eye muscles first and presents with the triad of ophthalmoplegia, ataxia, and areflexia. Anti-GQ1b antibodies are present in 90% of cases.

• Acute motor axonal neuropathy (AMAN), a.k.a. Chinese Paralytic Syndrome, attacks motor nodes of Ranvier and is prevalent in China and Mexico. It is likely due to an auto-immune response directed against the axoplasm of peripheral nerves. The disease may be seasonal and recovery can be rapid. Anti-GD1a antibodies are present. Anti-GD3 antibodies are found more frequently in AMAN.

• Acute motor sensory axonal neuropathy (AMSAN) is similar to AMAN but also affects sensory nerves with severe axonal damage. Like AMAN, it is likely due to an auto-immune response directed against the axoplasm of peripheral nerves. Recovery is slow and often incomplete.

• Acute panautonomic neuropathy is the most rare variant of GBS, sometimes accompanied by encephalopathy. It is associated with a high mortality rate, due to cardiovascular involvement, and associated dysrhythmias. Impaired sweating, lack of tear formation, photophobia, dryness of nasal and oral mucosa, itching and peeling of skin, nausea, dysphagia, constipation unrelieved by laxatives or alternating with diarrhea occur frequently in this patient group. Initial nonspecific symptoms of lethargy, fatigue, headache, and decreased initiative are followed by autonomic symptoms including orthostatic lightheadedness, blurring of vision, abdominal pain, diarrhea, dryness of eyes, and disturbed micturition. The most common symptoms at onset are related to orthostatic intolerance, as well as gastrointestinal and sudomotor dysfunction (Suarez et al. 1994). Parasympathetic impairment (abdominal pain, vomiting, obstipation, ileus, urinary retention, dilated unreactive pupils, loss of accommodation) may also be observed.

• Bickerstaff’s brainstem encephalitis (BBE), is further variant of Guillain-Barré syndrome. It is characterized by acute onset of ophthalmoplegia, ataxia, disturbance of consciousness, hyperreflexia or Babinski’s sign (Bickerstaff, 1957; Al-Din et al.,1982). The course of the disease can be monophasic or remitting-relapsing. Large, irregular hyperintense lesions located mainly in the brainstem, especially in the pons, midbrain and medulla are described in the literature. BBE despite severe initial presentation usually has a good prognosis. MRI plays a critical role in the diagnosis of BBE.

A considerable number of BBE patients have associated axonal Guillain–Barré syndrome, indicative that the two disorders are closely related and form a continuous spectrum.

Diagnosis

The diagnosis of GBS usually depends on findings such as rapid development of muscle paralysis, areflexia, absence of fever, and a likely inciting event. Cerebrospinal fluid analysis (through a lumbar spinal puncture) and electrodiagnostic tests of nerves and muscles (such as nerve conduction studies) are common tests ordered in the diagnosis of GBS.

• cerebrospinal fluid

Typical CSF findings include albumino-cytological dissociation. As opposed to infectious causes, this is an elevated protein level (100–1000 mg/dL), without an accompanying increased cell count pleocytosis. A sustained increased white blood cell count may indicate an alternative diagnosis such as infection.

• Electrodiagnostics

Electromyography (EMG) and nerve conduction study (NCS) may show prolonged distal latencies, conduction slowing, conduction block, and temporal dispersion of compound action potential in demyelinating cases. In primary axonal damage, the findings include reduced amplitude of the action potentials without conduction slowing.

Diagnostic criteria

Required

• Progressive, relatively symmetrical weakness of 2 or more limbs due to neuropathy
• Areflexia
• Disorder course < 4 weeks
• Exclusion of other causes (see below)

Supportive

• relatively symmetric weakness accompanied by numbness and/or tingling
• mild sensory involvement
• facial nerve or other cranial nerve involvement
• absence of fever
• typical CSF findings obtained from lumbar puncture
• electrophysiologic evidence of demyelination from electromyogram

Differential diagnosis

• acute myelopathies with chronic back pain and sphincter dysfunction
• botulism with early loss of pupillary reactivity
• diphtheria with early oropharyngeal dysfunction
• Lyme disease polyradiculitis and other tick-borne paralyses
• porphyria with abdominal pain, seizures, psychosis
• vasculitis neuropathy
• poliomyelitis with fever and meningeal signs
• CMV polyradiculitis in immunocompromised patients
• critical illness neuropathy
• myasthenia gravis
• poisonings with organophosphate, poison hemlock, thallium, or arsenic
• paresis caused by West Nile Virus
• spinal astrocytoma
• Motor Neurone Disease
• West Nile virus can cause severe, potentially fatal neurological illnesses, which include encephalitis, meningitis, Guillain Barre syndrome, and anterior myelitis.

Treatment

Supportive care with monitoring of all vital functions is the cornerstone of successful management in the acute patient. Of greatest concern is respiratory failure due to paralysis of the diaphragm. Early intubation should be considered in any patient with a vital capacity (VC) <20 ml/kg, a negative inspiratory force (NIF) <-25 cmH₂O, more than 30% decrease in either VC or NIF within 24 hours, rapid progression of disorder, or autonomic instability.

Once the patient is stabilized, treatment of the underlying condition should be initiated as soon as possible. Either high-dose intravenous immunoglobulins (IVIg) at 400 mg/kg for 5 days or plasmapheresis can be administered, as they are equally effective and a combination of the two is not significantly better than either alone. Therapy is no longer effective 2 weeks after the first motor symptoms appear, so treatment should be instituted as soon as possible. IVIg is usually used first because of its ease of administration and safety profile, with a total of five daily infusions for a total dose of 2 g/kg body weight (400 mg/kg each day). The use of intravenous immunoglobulins is not without risk, occasionally causing hepatitis, or in rare cases, renal failure if used for longer than five days. Glucocorticoids have not been found to be effective in GBS. If plasmapheresis is chosen, a dose of 40-50 mL/kg plasma exchange (PE) can be administered 4 times over a week.

Following the acute phase, the patient may also need rehabilitation to regain lost functions. This treatment will focus on improving ADL (activities of daily living) functions such as brushing teeth, washing, and getting dressed. Depending on the local structuring on health care, a team of different therapists and nurses will be established according to patient needs. An occupational therapist can offer equipment (such as wheelchair and special cutlery) to help the patient achieve ADL independence. A physiotherapist would plan a progressive training program and guide the patient to correct, functional movement, avoiding harmful compensations which might have a negative effect in the long run. A speech and language therapist would be essential in the patient regaining speaking and swallowing ability if they were intubated and received a tracheostomy. The speech and language therapist would also offer advice to the medical team regarding the swallowing abilities of the patient and would help the patient regain their communication ability pre-dysarthria. There would also be a doctor, nurse and other team members involved, depending on the needs of the patient. This team contribute their knowledge to guide the patient towards his or her goals, and it is important that all goals set by the separate team members are relevant for the patient's own priorities. After rehabilitation the patient should be able to function in his or her own home and attend necessary training as needed.

Prognosis

Most of the time recovery starts after the fourth week from the onset of the disorder. Approximately 80% of patients have a complete recovery within a few months to a year, although minor findings may persist, such as areflexia. About 5–10% recover with severe disability, with most of such cases involving severe proximal motor and sensory axonal damage with inability of axonal regeneration. However, this is a grave disorder and despite all improvements in treatment and supportive care, the death rate among patients with this disorder is still about 2–3% even in the best intensive care units. Worldwide, the death rate runs slightly higher (4%), mostly from a lack of availability of life support equipment during the lengthy plateau lasting 4--6 weeks, and in some cases up to 1 year, when a ventilator is needed in the worst cases. About 5–10% of patients have one or more late relapses, in which case they are then classified as having chronic inflammatory demyelinating polyneuropathy (CIDP).

Case reports do exist of rapid patient recovery.

Pregnancy and Guillain-Barre Syndrome

Even though maternal GBS is very rare, there may be approximately a 6% chance of GBS development in pregnancy. Disease should be early suspected and diagnosed in order to initiate prompt interventions because is associated with high rate of maternal morbidity and mortality. The pregnant patient improves with treatment but foetal death can occur. The risk of Guillain- Barre syndrome increases after delivery, particularly during the first 2 weeks postpartum. Campylobacter jejuni infection is the antecedent infection in approximately 30% of disease cases, so pregnant women must take special care in food handling and preparation to prevent such infection. Congenital and neonatal Guillain-Barre syndrome were also reported.

History

The disorder was first described by the French physician Jean Landry in 1859. In 1916, Georges Guillain, Jean Alexandre Barré, and Andre Strohl diagnosed two soldiers with the illness and discovered the key diagnostic abnormality of increased spinal fluid protein production, but normal cell count.

GBS is also known as acute inflammatory demyelinating polyneuropathy, acute idiopathic polyradiculoneuritis, acute idiopathic polyneuritis, French Polio, Landry's ascending paralysis and Landry Guillain Barre syndrome.

Notable sufferers

• Morten Wieghorst, International Danish footballer who once won the Scottish Football Championship with Celtic FC. He was diagnosed in 2000, and missed a year of his footballing career before returning in November 2001. He played 2 games for Celtic before returning to Denmark with Brøndby IF.
• Andy Griffith, actor on Andy Griffith Show, and Matlock. He developed Guillain-Barré in 1983.
• Rachel Chagall, actress, contracted GBS in 1982. In 1987 she portrayed Gabriela Brimmer, a notable disabilities activist.
• Joseph Heller, author, contracted GBS in 1981. This episode in his life is recounted in the autobiographical No Laughing Matter, which contains alternating chapters by Heller and his good friend Speed Vogel.
• Franklin D. Roosevelt, U.S. president. In 2003, a peer-reviewed study found that it was more likely that Roosevelt's paralysis--long attributed to poliomyelitis--was actually Guillain-Barré syndrome.
• Markus Babbel, former international footballer, contracted GBS in 2001, following a period suffering from the Epstein-Barr virus. He lost almost an entire year of his footballing career between the two illnesses and never again demonstrated the same level of ability that won him over 50 caps for Germany.
• Serge Payer, Canadian-born professional hockey player. After battling and overcoming the syndrome, He set up the Serge Payer foundation, which is dedicated to raising money for research into new treatments and cures for Guillain-Barré syndrome.
• Hans Vonk, Dutch conductor.
• Lucky Oceans, Grammy Award winning musician with Asleep at the Wheel was diagnosed with GBS in 2008.
• William “The Refrigerator” Perry, former professional American football player with the Chicago Bears was diagnosed with GBS in 2008.
• Tony Benn, British politician.
• Len Pasquarelli, sports writer and analyst for ESPN and resident of the Pro Football Writers of America, diagnosed in 2008.

External links

• Mayo Clinic (2009). MayoClinic.com,_Guillain-Barre
• GBS/CIDP Foundation International
• Guillain-Barré Syndrome Support Group (UK and Ireland)
• Information from GBS Association of New South Wales (AU)
• miller_fisher at NINDS
• Lucky Oceans interview - Oceans is interviewed by Dr Norman Swan on ABC Radio National - (8 March 2009)