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