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31 Cards in this Set

  • Front
  • Back
what are the types of electrodiagnosis studies
nerve conduction studies
needle EMG
conduction velocity=
distance/proximal latency-distal latency
what are symptoms with focal slowing
no symptoms
conduction block
message doesn't reach one of the electrodes
what type of demylination is there with a conduction block
internodal demyelination
internodal demylination
demyelination of one or more internodal segments
what type of demyelination is there with focal slowing
paranodal demyelination
what happens with paranodal demyelination
widening of the node of ranvier
what happens with conduction failure
no response on both sides and wallerian degeneration
what pathologies are seen with segmental demyelination
focal slowing
conduction block
what pathologies do you see with axon loss
conduction block
conduction failure
when do you see conduction block and conduction failure
conduction block before wallerian degeneration
conduction failure after wallerian degeneration
what is the sign of conduction block
drop in amplitude or area
what happens if fastest axon is intact
velocity will remain the same
what happens to amplitude in partial axonal loss
amplitude decreases because we have lost half of the axons
pathology of focal slowing
segmental demyelination
pathology of a conduction block
segmental demyelination
axon loss prior to completion of wallerian degeneration
pathology of absent or low amplitude responses
axon loss
measurement of CMAP
measurement of SNAP
what should you ask yourself with a drop in amplitude
is it a partial conduction block or temporal dispersion
when is temporal dispersion and bigger deal
in sensory studies
conduction block=
more than 50% loss in amplitude or area
SNAP is reduced or absent in what pathologies
mixed mononeuropathies
SNAP is normal in what pathologies
spinal cord pathology
what does low response tell
only that there is a problem but not where the problem is at
what is useful in localization of pathology
early study
what are the effects of wallerian degeneration on days 1 and 2
all axons still intact
what are the effects of wallerian degeneration at day 10
no axons
what happens to motor unit in myopathy
motor unit gets smaller
what happens to motor unit in late neurogenic disease
large motor unit