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DPT 712: CLINICAL ELECTROPHYSIOLOGY EXAM QUESTIONS WITH VERIFIED ANSWERS GRADED A++
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DPT 712: CLINICAL ELECTROPHYSIOLOGY EXAM QUESTIONS WITH VERIFIED ANSWERS GRADED A++ What is EMG? Measurement of a muscle contraction's electrical activity The summation of action potentials from contracting muscle fibers How do the number of muscle fibers firing relate to what is seen in the EM...

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  • November 13, 2024
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  • 2024/2025
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DPT 712: CLINICAL ELECTROPHYSIOLOGY EXAM

QUESTIONS WITH VERIFIED ANSWERS GRADED A++

What is EMG?

Measurement of a muscle contraction's electrical activity

The summation of action potentials from contracting muscle fibers

How do the number of muscle fibers firing relate to what is seen in the EMG?

The more muscle fibers that fire, the greater the number of APs recorded and the

greater the EMG voltage

What is intramuscular EMG?

Analyzes individual APs from a motor unit to determine the extent of nerve or muscle

damage

What is the electrical source in EMG?

The muscle membrane potential of about -90 mV. Measured EMG potentials range

between less than 50 uV and up to 20-30 mV depending on the muscle under

observation

Why is EMG needed?

Because it is the Gold Standard test for nerve function (phyisological)

Provides a better assessment of nerve damage than current diagnostic imaging

measures

,Used in conjuction with imaging studies (anatomical)

One of many diagnostic tools used for neuromuscular disorders

What are symptoms of nerve damage?

Numbness and tingling

"Funny sensation"

Weakness, fatigue, clumsiness

Pain

What are nerve damage signs?

Loss of/changes in reflexes

Falls, gait changes

Dropping items

What are locations that a nerve can be damaged?

Anterior Horn Cell (AHC)

Axon: Spinal/peripheral N

MEP/neuromuscular junction

Muscle fibers

What is the time to recovery with remyelination in neuropraxia?

2-12 weeks

What is the time to recovery in collateral sprouting and axonal regeneration in

incomplete injuries (axonotmesis) or neuropraxia?

2-6 months

What is the time to recovery for axonal regeneration in axonotmesis 2nd, 3rd, and

4th degree?

, 2-18 months

What is the time to recovery for Neurotmesis 5th degree?

No regeneration without surgical repair

What should be done in the first 0-7 days after nerve injury?

Baseline clinical examination for future comparison, no EMG since need 2 weeks for the

injury to stabilize

What should be done 10-21 days after a nerve injury?

Initial study: Axonal degeneration occurs in this time frame, so this will distinguish

axonal loss from demyelination. Assesses extent of axonal loss (reduced CMAP

amplitude on NCV and number of MUPs with max contraction

What should be done 3 to 6 months after a nerve injury?

Follow-up study: Documents extent of reinnervation in distant muscles

What should be done 2 years after a nerve injury?

This is the maximum time for functional reinnervation

What can diagnostic EMG be used to study?

Motor unit's intrinsic electrical activity

Based on innervation of muscle fiber by LMN (alpha motor neuron)

Clinically useful in studying: Anterior Horn Cell, nerve root, peripheral nerve, muscle

Under what four conditions is audio and visual information obtained during EMG

instrumentation?

1. Inserting/moving needle

2. At rest

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