INTRO TO CLINICAL EMG DEFN

Question 1

changes polarity of axon?

Answer 1

stimulator

Question 2

conduction velocity eqn?

Answer 2

distance/proximal latency-distal latency

Question 3

*due to paranormal demyelination

loss of saltatory conduction in 1 segment

slowing does not cause symptoms

Answer 3

focal slowing

Question 4

*due to intermodal demyelination

with a conduction block, the amplitude drops form distal to proximal

Answer 4

conduction block

Question 5

focal slowing

conduction block

this is an electrodiagnostic manifestations of the single axon model?

Answer 5

segmental demyelination

Question 6

conduction block

conduction failure

this is an electrodiagnostic manifestations of the single axon model?

prior/after wallerian degeneration?

Answer 6

axon loss

conduction block
conduction failure

Question 7

sensory conduction studies

motor conduction studies

late responses (H reflex and F wave)

what is this elector diagnostic study?

Answer 7

nerve conduction studies

Question 8

fibrillation potentials

motor unit action potentials
-recruitment and morphology

Answer 8

needle EMG

Question 9

what is this sensory conduction study?

studies are performed by recording potentials directed toward the sensory receptors

increase AMP

Answer 9

antidromic study

Question 10

what is this sensory conduction study?

studies are obtained by recording potentials directed away from these receptors.

Answer 10

orthodromic study

Question 11

– Spontaneous action potential of a DENERVATED single muscle action potential

Answer 11

fibrillation potential

Question 12

– Summated muscle fibers action potentials actiivated voluntarily and innervated by a SINGLE MOTOR UNIT

Answer 12

Motor unit action potential (MUAP)

Question 13

– Spontaneous discharge of MUAP

Answer 13

Fasciculation potential