EDT EDT Nerve Conduction Studies Interpretation

Question 1

What does a prolonged distal latency in a motor nerve conduction study primarily indicate?

Accepted Answer

Slowed conduction at the distal segment, suggesting demyelination

Answer

Prolonged distal latency indicates slowed conduction in the distal nerve segment, which is characteristic of demyelinating pathology.

Question 2

In a sensory nerve conduction study, which parameter is most sensitive for detecting early axonal loss?

Accepted Answer

Amplitude of the SNAP

Answer

SNAP amplitude is the most sensitive indicator of axonal loss because it directly reflects the number of functioning sensory axons.

Question 3

A compound muscle action potential (CMAP) with normal distal latency but reduced amplitude most likely indicates:

Accepted Answer

Axonal motor neuropathy

Answer

Reduced CMAP amplitude with normal distal latency is the hallmark of axonal motor neuropathy, reflecting loss of motor axons.

Question 4

Which NCS finding is characteristic of carpal tunnel syndrome?

Accepted Answer

Prolonged median sensory peak latency across the wrist

Answer

Carpal tunnel syndrome characteristically shows prolonged median sensory peak latency across the wrist due to focal demyelination at the carpal tunnel.

Question 5

Temporal dispersion in a motor nerve conduction study refers to:

Accepted Answer

Broadening and reduction of CMAP with proximal stimulation

Answer

Temporal dispersion refers to the broadening and amplitude reduction of the CMAP with proximal stimulation, caused by differential slowing of demyelinated axons.

(EDT) Electrodiagnostic Technician Certification Practice Test

(EDT) Electrodiagnostic Technician Certification Practice Test

EDT EDT Nerve Conduction Studies Interpretation