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From the Department of Neurology, University of Alabama at Birmingham, and the Veterans Affairs Medical Center, Birmingham, AL.
Address correspondence and reprint requests to Dr. Shin J. Oh, Department of Neurology, University of Alabama at Birmingham, UAB Station, Birmingham, AL 35294; e-mail: shinjoh{at}uab.edu
| Article Abstract |
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| Introduction |
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In 1958, Wartenberg4 discussed the concept of a sensory equivalent to the ascending paralysis of GBS. Although Asbury1 provided diagnostic criteria for a sensory loss and areflexia variant in 1981, reported clinical cases meeting these criteria have been scarce. Thus, there has been some question as to whether sensory GBS exists.5 We reported four cases of sensory GBS in 1990 in abstract form.6 In the current article, we report eight cases of an acute, monophasic, sensory neuropathy accompanied by reduced muscle stretch reflexes, high spinal fluid protein, and nerve conduction features of demyelination, which meets most of the diagnostic criteria of a sensory variant of GBS.
| Materials and methods. |
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Routine nerve conduction studies (NCS) were performed using standard surface electrode placement as previously described.7 All patients underwent testing of sural, peroneal, posterior tibial, median, and ulnar nerves. A monopolar needle electromyogram (EMG) was performed in all patients on a minimum of three leg muscles, and four patients had H-reflex testing.7 In Patient 8, the near-nerve needle sensory NCS of the plantar nerve was performed.8 Electrophysiologic criteria of demyelination were based on the following: 1) prolongation of terminal latency and F-wave by more than 150% of the normal mean; 2) nerve conduction velocity (NCV) slowing by more than 40% below the normal mean; 3) conduction block (more than 50% drop in the amplitude and area in the proximal compound muscle action potential); and 4) dispersion phenomenon (abnormal compound muscle action potential [CMAP] or compound nerve action potential [CNAP] with multiple phases and prolonged duration).7
In four patients, CSF was obtained by lumbar puncture for diagnostic purposes within the first 4 weeks of disease. One patient had a lumbar puncture 3 months after onset, one patient refused the test, and in two others, who were evaluated 7 and 10 months after onset of disease, the CSF evaluation was not performed. All of these patients had basic peripheral neuropathy workups, which included thyroid and rheumatology profiles, vitamin B12 and folic acid, hemoglobin A1C, erythrocyte sedimentation rate, and immunoelectrophoresis of serum protein by immunofixation. Additional studies were performed in some patients, depending on the findings.
Reports of three illustrative cases. Patient 4 was a 21-year-old man who was well until 3 weeks before evaluation, when he developed diffuse pruritus after a day of hiking in the local woods. The next day, he developed rhinorrhea, malaise, a nonproductive cough, and a low-grade fever. One week later, he experienced the acute onset of prickly dysesthesias from his knees distally. Over the ensuing week, his symptoms ascended to his proximal thighs and arms. He also experienced transient "pins-and-needles" dysesthesia across his anterior thorax. This evolved to hyperesthesia over the following week, at which time he presented for evaluation. His neurologic evaluation was remarkable only for mild symmetric vibratory loss in the toes and diminution of Achilles and triceps reflexes. Laboratory workup was remarkable only for elevation of CSF protein ( table 1). Initial electrophysiologic examination ( table 2) demonstrated a demyelinating distal motor neuropathy, with a normal EMG. After refusing IV immunoglobulin treatment, the patient was treated with one course of prednisone (60 mg/day for 1 week, gradually tapering over the next 3 weeks) and had subsequent complete resolution in symptoms and signs within 4 weeks.
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Patient 7 was a 48-year-old man who developed a febrile illness with severe skin rash after returning from a trip to Europe. He was treated with doxycycline. The next day, he developed numbness on the soles of both feet, which progressed over the next week to the knees, with walking difficulty due to poor balance. Neurologic examination showed proprioception and vibratory loss up to the knees without pinprick loss below the knees, diffuse areflexia, and sensory ataxic gait. MRI scan and lumbar myelogram were normal. CSF showed 144 mg/dL in protein and eight mononuclear cells. NCS showed demyelinating neuropathy (see table 2). Despite treatment with IV immunoglobulin and prednisone for 3 days, the numbness extended up to his hips and hands. Neurologic exam at the University of Alabama at Birmingham 3 weeks after onset confirmed severe sensory ataxia, with markedly positive Romberg test and abnormality on heel-to-shin tests. With one course of plasma exchange, his symptoms began to improve. This improvement continued over the next 7 months, by which time he was completely asymptomatic except for slight pinprick loss below the right knee.
| Results. |
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Laboratory findings. All of four patients in whom CSF was collected within the first month of illness had albuminocytologic dissociation (see table 1). In one patient, who had CSF collected in the fourth month of illness, the findings were normal. All patients had essentially normal routine chemistry results, complete blood count, liver function tests, folate, vitamin B12, rapid protein reagent, immunofixation serum protein analysis, erythrocyte sedimentation rate values, and rheumatology and thyroid profiles. Heavy metal results were normal in the three patients assessed. Serum autoantibodies (MAG, GM1, GQ1b, GD1b, anti-Hu, and SGPG) were normal in four tested cases. In individual cases, Lyme antibody, vitamin E, CRP, phytanic acid, and arylsulfatase-A values were normal.
Electrophysiologic findings. The NCS was performed within 4 weeks of symptom onset in four patients, within 12 to 16 weeks in two, and over 28 weeks later in two (see table 2) (additional material related to this article can be found on the Neurology Web site. Go to www.neurology.org and scroll down the Table of Contents for the January 9 issue to find the title link for this article). There was electrophysiologic evidence of demyelination in at least two nerves in all cases. Evidence of demyelination was observed in motor nerve conduction in seven patients and in the sensory nerve conduction in two patients. Near-nerve needle sensory NCS of the plantar nerves was needed to document demyelination in Patient 8 because the routine NCS was normal.
Motor NCS was abnormal in seven patients. Evidence of demyelination was most prominently observed in the terminal latencyin the peroneal nerve in seven patients, in posterior tibial and median nerves in four patients, and in the ulnar nerve in three patients. Though a slow NCV was observed in posterior tibial and peroneal nerves in five patients and in median and ulnar nerves in three patients, evidence of demyelination was observed in only two patients. Conduction block (>50% drop in the proximal amplitude compared with the distal CMAP amplitude) was present in posterior tibial nerves in two patients and in the peroneal nerve in one patient.7 Dispersion phenomenon was found in the posterior tibial nerve in two patients. In Patients 6 and 7, evidence of demyelination was widespread and easily recognized, whereas in other five patients it was spotty and confined to the terminal latency.
Sensory nerve conduction was abnormal in at least two nerves in seven patients and in one nerve in one patient. Mildly slow NCV was the most common finding, and was observed in all cases. Sensory CNAP was absent in four cases and low CNAP amplitude were seen in six cases. Mixed nerve conduction was abnormal in five patients, in the ulnar nerve in four patients, and in the median nerve in three patients. F-wave latency was prolonged in ulnar and median nerves in four patients and in peroneal and posterior tibial nerves in seven patients. Only two patients had an F-wave latency in the range of demyelination. H-reflex was abnormal in all of four tested patients. Needle EMG studies were essentially normal in all cases, except for a high-amplitude motor unit potential in some tested muscles in three cases.
Treatment response and outcome. Three patients were treated with immunotherapies. Patient 4 had a course of prednisone with complete recovery. Patient 6 received small-dose (20 mg/day) prednisone initially without any benefit, but then had satisfactory improvement with one course of IV immunoglobulin. Patient 7 initially received steroid and IV immunoglobulin therapy without any benefit but began to improve with plasma exchange, with subsequent satisfactory recovery. Of five patients who received no immunotherapy, three completely recovered and two have had a stable deficit. No patients experienced a relapse of neuropathy during follow-up periods of 2 to 11 years.
| Discussion. |
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Four of our cases met all the diagnostic criteria for the sensory variant GBS,1 and the other four met four of the five diagnostic criteria. In all four patients who had CSF collected in the first 4 weeks, albuminocytologic dissociation, the most helpful diagnostic laboratory feature in GBS, was observed. All had electrophysiologic evidence of demyelination, the other helpful diagnostic laboratory feature, in at least two nerves. Demyelination was most convincing in motor nerve conduction in seven patients and in sensory nerve conduction in one, indicating that motor NCS is the key for the diagnosis of demyelinating neuropathy. Even in motor NCS, however, the obvious evidence of demyelination was recognized in only two patients. In others, evidence of demyelination was confined to the terminal latencies, as observed in previously reported cases.9-11 This is understandable, given the nature of the clinical presentation of sensory GBS. The difficulty in demonstrating demyelination in sensory nerve conduction is due to the technical limitation of sensory NCS performed with surface electrodes.7 Certainly, this can only be achieved by the near-nerve sensory nerve conduction as demonstrated in Patient 8, and in some patients with chronic sensory demyelinating neuropathy (CSDN).12 In general, our diagnostic criteria of sensory GBS were much stricter and better defined than those of Asbury.1
Following the traditional nosologic designation based on clinical features, we believe that the designation of sensory GBS in these cases is justified, even in the electrophysiologic presence of motor fiber demyelination. This is because the electrophysiologic data do not necessarily correlate with neuropathic symptoms and deficits,7,13 and GBS is often placed in the category of motor neuropathy, despite the fact that 58 to 76% of patients have sensory NCS abnormalities.14,15
A chronic counterpart of sensory GBS already exists in CSDN as a sensory variant of chronic inflammatory demyelinating polyradiculoneuropathy. This condition is a sensory neuropathy characterized by subacute or chronic (>4 weeks) development of neuropathy, demyelination in the NCS, a high CSF protein in 75% of cases, and responsiveness to immunotherapy.16,17 Evidence of demyelination is easily found electrophysiologically in motor nerves and pathologically in sural nerves. Thus, in CSDN, motor fiber demyelination is a common finding and a key for diagnosis of demyelinating neuropathy, as noted as in our cases.
We believe that the diagnosis of sensory GBS is important because it should help the clinician in planning potential immunotherapies, as noted in three of our cases, and offers a generally favorable prognosis to patients, in contrast to the slow but steady progression usually associated with idiopathic sensory neuropathy.18,19 The differentiation of sensory GBS from acute sensory neuronopathy is also important in view of the poor recovery rate in the latter.5,20 Sensory neuronopathy can be differentiated by the classic pattern of nerve conduction abnormalityabsent sural nerve action potentials in the presence of normal motor nerve conduction.7 The quick onset and lack of progression should allow differentiation between paraneoplastic sensory neuronopathy and sensory GBS.21
Historically, there has been ongoing debate concerning this disease since 1946.22-24 In three reports, 12 cases were cited as examples of sensory GBS. However, these cases hardly meet the current diagnostic criteria of the sensory variant of GBS according to our review.
In 1980, three patients with acute sensory neuronopathy were reported. This sensory neuronopathy was characterized by sudden numbness and pain over the entire body a few days after initial antibiotic treatment for a febrile illness, profound sensory ataxia, areflexia, absent sensory nerve potentials, a high CSF protein, and severe static, residual sensory deficits.20 The authors concluded that this represented an acute sensory neuronopathy with lesions in the dorsal root ganglia, rather than a demyelinating neuropathy.
In 1988, a patient who presented with severe sensory loss and ataxia, total areflexia, elevated CSF protein with pleocytosis, and terminal latency in the demyelinating range in the median motor nerve was reported.10 At autopsy, there was extensively lymphocytic infiltration of nerves and posterior roots, with sparing of the anterior roots. Teased fiber preparation of nerve showed a demyelinating lesion. This case was cited as the first case of a sensory GBS with autopsy in the subsequent literature. However, the patient also had mild weakness in the triceps, finger extensors, intrinsic muscles of the hands, hip flexors, and foot dorsiflexors. Thus, though histologic and electrophysiologic criteria of GBS were met, this case was not an example of sensory GBS because of presence of mild motor weakness.
In 1990, we reported four cases of sensory GBS in an abstract.6 In the same year, 42 patients who had acute or subacute sensory neuropathy were reported.5 Their cases were characterized by an absence of sensory CNAP potential, normal CSF findings, loss of large myelinated fibers, and axonal atrophy without inflammation in the sural nerve biopsy. The authors concluded that these cases represented an immune-mediated or vascular sensory neuropathy or radiculopathy, rather than sensory GBS.
In 1992, a case of sensory GBS was reported.9 The patient developed sensory ataxia with areflexia and proprioception loss over 2 to 3 days following a viral illness, high CSF protein, absent sensory SNAP but demyelinating value of terminal latency, and a 39% decrease in the CMAP on proximal stimulation of the median nerve. The patient had a complete recovery in 1 month. This case clearly meets the strict diagnostic criteria of the sensory variant of GBS as outlined above.9 In 1996, two cases of acute sensory neuropathy with prolonged terminal latency in the demyelinating range and good recovery in a few months were reported. CSF protein was not examined in these cases.11
From this review, it is clear that acute sensory neuropathy represents two clinical syndromes: acute sensory neuronopathy involving the dorsal root ganglia, and sensory GBS, an acute demyelinating neuropathy that presents clinically with only sensory peripheral nerve involvement. The former entity is recognized by the sensory neuronopathy pattern (absent sensory CNAP in the presence of normal motor nerve conduction) in the NCS, and the latter predominantly by the demyelinating motor nerve conduction, especially in the terminal latency. CSF protein is not helpful in distinguishing sensory neuronopathy from sensory GBS because it may be elevated in both disorders.20 The most important distinction between these two entities lies in the clinical outcome: in acute sensory neuronopathy the recovery rate is poor, whereas in sensory GBS the recovery is good, as noted in our cases.
| Footnotes |
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Additional material related to this article can be found on the Neurology Web site. Go to www.neurology.org and scroll down the Table of Contents for the January 9 issue to find the title link for this article.
| References |
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