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Electromyography can demonstrate fibrillation potentials and positive sharp waves in the more distal weak limb muscles along with decreased recruitment of polyphasic, long-duration, large-amplitude MUAPs.
4 Electrophysiologic findings of CIP are characterized by fibrillation potentials and positive sharp waves decreased amplitudes of compound muscle and sensory nerve action potentials.
Electromyography showed fibrillation and positive sharp waves in all tested small muscles of hands and feet suggestive of MND.