Guillain-Barre Syndrome Workup
- Author: Michael T Andary, MD, MS; Chief Editor: Robert H Meier III, MD more...
Approach Considerations
Guillain-Barré syndrome (GBS) is generally diagnosed on clinical grounds. Basic laboratory studies, such as complete blood counts and metabolic panels, are of limited value in the diagnosis of GBS. They are often ordered, however, to exclude other diagnoses, and to better assess functional status and prognosis. The ordering of specific tests should be guided by the patient's history and presentation.
Abnormalities in nerve conduction studies (NCS) that are consistent with demyelination are sensitive and represent specific findings for classic GBS.[80] Frequent evaluations of these parameters should be performed at bedside to monitor respiratory status and the need for ventilatory assistance.
Lumbar puncture for cerebrospinal fluid (CSF) studies is recommended. During the acute phase of GBS, characteristic findings on CSF analysis include albuminocytologic dissociation, which is an elevation in CSF protein (>0.55 g/L) without an elevation in white blood cells. The increase in CSF protein is thought to reflect the widespread inflammation of the nerve roots.
Imaging studies, such as magnetic resonance imaging (MRI) or computed tomography (CT) scanning of the spine, may be more helpful in excluding other diagnoses, such as mechanical causes of myelopathy, than in assisting in the diagnosis of GBS.
Peripheral Neuropathy Workup
A basic peripheral neuropathy workup is recommended in cases in which the diagnosis is uncertain. These studies may include the following:
- Thyroid panel
- Rheumatology profiles
- Vitamin B-12
- Folic acid
- Hemoglobin A1C
- Erythrocyte sedimentation rate (ESR)
- Rapid protein reagent
- Immunoelectrophoresis of serum protein
- Tests for heavy metals
Biochemical Screening
Biochemical screening includes the following studies:
- Electrolyte levels
- Liver function tests (LFTs)
- Creatine phosphokinase (CPK) level
- Erythrocyte sedimentation rate (ESR)
LFT results are elevated in as many as one third of patients. CPK and ESR may be elevated with myopathies or systemic inflammatory conditions. A stool culture for C jejuni and pregnancy test are also indicated.
The syndrome of inappropriate antidiuretic hormone (SIADH) may occur.
Serologic Studies
Serologic studies are of limited value in the diagnosis of GBS. Assays for antibodies to the following infectious agents may be considered:
- Campylobacter jejuni
- Cytomegalovirus
- Epstein-Barr virus
- Herpes simplex virus (HSV)
- HIV
- Mycoplasma pneumoniae
An increase in titers for infectious agents, such as CMV, EBV, or Mycoplasma, may help in establishing etiology for epidemiologic purposes. HIV has been reported to precede GBS, and serology should be tested in high-risk patients to establish possible infection with this agent.
Serum autoantibodies
Serum autoantibodies are not measured routinely in the workup of GBS, but results may be helpful in patients with a questionable diagnosis or a variant of GBS. Antibodies to glycolipids are observed in the sera of 60-70% of patients with GBS during the acute phase, with gangliosides being the major target antigens.[81]
Antibodies to GM1 frequently are frequently found in the sera of patients with the motor axonal neuropathy or AIDP variants of GBS. Antecedent C jejuni infections are closely associated with elevated titers of anti-GM1 antibodies. Anti-GQ1b antibodies are found in patients with GBS with ophthalmoplegia, including patients with the Miller-Fisher variant. Other antibodies to different major and minor gangliosides also have been found in GBS patients.
Nerve Conduction Studies
Nerve conduction studies (NCS) can be very helpful in the diagnostic workup of patients with suspected GBS. Abnormalities in NCS that are consistent with demyelination are sensitive and represent specific findings for classic GBS.[80]
A delay in F-waves is present, implying nerve root demyelination.[2, 82] Nerve motor action potentials may be decreased. This is technically difficult to determine until the abnormality is severe. Compound muscle action potential (CMAP) amplitude may be decreased. Although most patients exhibit sensory abnormalities on NCS, these findings are much less marked than they are in motor nerves.
Frequently, patients show evidence of conduction block or dispersion of responses at sites of natural nerve compression. The extent of decreased action potentials correlates with prognosis. Prolonged distal latencies may be present. Abnormal H-reflex may be noted.
Although NCS results classically show a picture of demyelinating neuropathy in most patients, axonal neuropathy and inexcitable results are found in certain subgroups. The inexcitable studies may represent either axonopathy or severe demyelination with distal conduction block.
On NCS, demyelination is characterized by nerve conduction slowing, prolongation of the distal latencies, prolongation of the F-waves, conduction block, and/or temporal dispersion. Changes on NCS should be present in at least 2 nerves in regions that are not typical for those associated with compressive mononeuropathies (preferentially in anatomically distinct areas, such as an arm and a leg or a limb and the face).
The needle examination is of limited value in GBS. Reduced motor unit recruitment and absent denervation help to support the suggestion of a demyelinating mechanism, although the same changes can be observed in early axonal damage with pending wallerian degeneration. In severe cases, denervation changes may be observed later in the disease course.
In the axonal variant of the disease, absent or markedly reduced distal compound muscle action potentials (CMAP) are observed on NCS. On needle examination, profuse and early denervation potentials also support the conclusion that there has been axonal injury.
Rarely neurophysiologic testing is normal in patients with GBS. This is believed to be due to the location of demyelinating lesions in proximal sites not amenable to study.
Pulmonary Function Tests
Maximal inspiratory pressures and vital capacities are measurements of neuromuscular respiratory function and predict diaphragmatic strength. Maximal expiratory pressures also reflect abdominal muscle strength. Frequent evaluations of these parameters should be performed at bedside to monitor respiratory status and the need for ventilatory assistance.
Forced vital capacity (FVC) is very helpful in guiding disposition and therapy.[60] Patients with an FVC of less than 15-20 mL/kg, maximum inspiratory pressure of less than 30 cm H2 O, or a maximum expiratory pressure of less than 40 cm H2 O generally progress to require prophylactic intubation and mechanical ventilation. Respiratory assistance should also be considered when there is a decrease in oxygen saturation (arterial PO2 < 70 mm Hg).
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.
A normal CSF protein level does not rule out GBS, however, as the level may remain normal in 10% of patients. CSF protein may not rise until 1-2 weeks after the onset of weakness.
Normal CSF cell counts may not be a feature of GBS in HIV-infected patients. CSF pleocytosis is well recognized in HIV-associated GBS.
Magnetic Resonance Imaging
MRI is sensitive but nonspecific for diagnosis; however, it may be an effective diagnostic adjunct.[83, 84] MRI can reveal nerve root enhancement.
Spinal nerve root enhancement with gadolinium is a nonspecific feature seen in inflammatory conditions and is caused by disruption of the blood-nerve barrier. Selective anterior nerve root enhancement appears to be strongly suggestive of GBS.[85] The cauda equina nerve roots are enhanced in 83% of patients.
Other Studies
Muscle biopsy may help to distinguish GBS from a primary myopathy in unclear cases. Many different abnormalities may be seen on electrocardiography, including second- and third-degree atrioventricular (AV) block, T-wave abnormalities, ST depression, QRS widening, and various rhythm disturbances.
Histologic Findings
Lymphocyte and macrophage infiltration is observed on microscopic examination of peripheral nerves. Macrophage influx is believed to be responsible for the multifocal demyelination seen in GBS. A variable degree of wallerian degeneration also can be observed with severe inflammatory changes. Cellular infiltrates are scattered throughout the cranial nerves, nerve roots, dorsal root ganglions, and peripheral nerves.
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