Your patient presents with the following nerve conduction study (NCS) and electromyography (EMG) findings: Decreased CMAP and SNAP amplitudes,motor,and sensory NCV values greater than 75%,no insertional activity,no spontaneous EMG activity but polyphasic waveforms.This is suggestive of which of the following neuropathic conditions?

Question

Quizplus · Accepted Answer

The findings of decreased compound muscle action potential (CMAP) and sensory nerve action potential (SNAP) amplitudes with preserved motor and sensory nerve conduction velocities (NCV) greater than 75% of normal, absence of insertional and spontaneous EMG activity, but presence of polyphasic waveforms are indicative of long-term axonal loss. These features suggest that there has been axonal degeneration with subsequent reinnervation, which is characteristic of chronic or long-term axonal neuropathies.

Your Patient Presents with the Following Nerve Conduction Study (NCS)