When performing EDX studies in a patient with suspected acute Guillain-Barré syndrome within the first week of symptom onset, results may be:
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A
Always dramatically abnormal from day one
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B
Initially normal or show only subtle F-wave abnormalities, as demyelination evolves over days to weeks
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C
Consistent with a pure axonal pattern immediately
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D
Show marked denervation on needle EMG within 24 hours