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15 Cards in this Set
- Front
- Back
- 3rd side (hint)
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NCS: normal motor and sensory
EMG: normal spontanteous activity Normal activation Decreased Recruitmehnt Normal MUAP Morpholoyg |
Hyperacute axonal loss
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within 3 days of trauma or nerve infarction
PE: clinical weakness/numbness Pathology: prior to wallerian degenration |
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NCS
Motor and sensory show decresed amplitude. Conduction Velocity is normal (>75%nml) and Distal latency is normal(>75%nml) EMG: no spontaneous activity Normal activation Decreased recuritment normal MUAP morphology |
Acute Axonal loss
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>3days <2 weeks after trauma or nerve infarction
patholgy: wallerian degenration has occurred |
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NCS
Motor and sensory show decresed amplitude. Conduction Velocity is normal (>75%nml) and Distal latency is normal(>75%nml) EMG spontaneous activity: fibrillation potentials & positive waves normal activation decreased recruitment normal MUAP morphology |
Subacute Axonal loss
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>2weeks < 2months after trauma or nerve infarction
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NCS: Decreased amplitude motor and sensory
normal CV (>75%) normal DL (<130%) EMG +fibrillation potentials and positive waves normal activation decreased recruitment MUAP morphology- long duration, high amplitude, polyphasic |
Subacute-Chronic axonal loss
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>2 mo
Commonly seen in most polyneuropathies Wallerian degeneration abnormal spontaneous activity +reinervation |
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NCS: normal amplitude motor and sensory
normal CV (>75%) normal DL (<130%) EMG no spontaneous activity normal activation decreased recruitment MUAP morphology- long duration, high amplitude, polyphasic |
Chronic axonal loss
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months to years
rinnervation complete |
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Motor: normal aplitude
normal CV normal DL conduction block and slowing at the lesion LR: increased no spontaneous activity normal activation decreased recruitment |
Demyelination (slowing and conduction block): single proximal lesion
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e.g., radial neuropathy at the spiral groove
Note: if history tells this lesion <4days old than have to repeat study in 1 week to r/o hyperacute axonal lesion |
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NCS
Sensory: nml distal to lesion Motor: decreased CV at lesion DL nml LR: incresaed EMG: no spontaneous activity nml activation nml recruitment nml morphology |
Demylination (Slowing Alone): Single proximal lesion
Demyelination (Slowing and conduction block): single proximal lesion |
no wallerian degenration
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amplitude decreased motor and sensory.
CV: nml motor CV decreased sensory DL: increased motor and sensory Motor and sensory conduction block and slowing at lesion increased late responses EMG -no spont activity -nml activation -nml recruitment -MUAP morphology |
demyelination (slowing and conduction block) single distal lesion
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e.g., ulnar neuropathy at the elbow.
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NCS: decreased amplitude motor and sensory
CV: nml for motor, decreased for sensory DL: increased, conduction block and slowing at the lesion LR: increased EMG: no spont, nml activation, decreased recruitment MUAP morphology nml |
demyelenation (slowing and conduction block): single distal lesion
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e.g., CTS
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NCS:
-motor: --nml motor amplitude, decreased sensory amplitude. --nml motor CV and decrerased sensory CV Increased DL motor & sensory --increased LR EMG: normal |
Demyelination (slowing alone) single distal lesion
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common seen in many distal entrapment neuropathies
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decreased motor and sensory amplitude
CV: normal/sl reduced CV & DL EMG: fibs, positive waves, nml activation markidly decreased recruitment MUAP morphology, short duration, low amplitude and polyphasic |
early reinenervation after severe denervation
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normal NCS
EMG: nml or fibrillation potentials/postive waves, nml activation. normal activation, early recruitment, MUAP morphology: short duration, low amplitude, polyphasic |
general myopathy
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normal NCS
EMG: fibrillation potentials/positive waves?CRDs nml activation nml, early or sl decreased recruitment MUAP morphology: short duration, low amplitude, plyphasic and or long duration, high amplitude, polyphasic |
chronic myopathy with denervationg features
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polymyositis, inc body myositis
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NCS:
sensory:nml motor: nml CV & DL postsynaptic: -amp: nml -decrement: 3Hz RNS Presynamptic: amlitude: decreased -decrement: 3Hz RNS -incremient 50 Hz RNS |
NMJ lesions
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NCS: normal
EMG: no spont activity, decreased activation nml recruitmeent and MUAP morpholgy |
CNS lesion
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