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21 Cards in this Set
- Front
- Back
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2 EMG tests for the NMJ
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repetitive stimulation
single fiber EMG (SFEMG) |
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2 contraindications for EMG
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bleeding diathesis (e.g. warfarin)
ICD |
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EMG has high/low sensitivity & specificity for radiculopathy
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low
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EMG is indicated for radiculopathy for ___
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deciding whether surgery is needed
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normal nerve conduction velocity is ___ in upper extremity, ___ in lower
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50--60 m/s
40--50 m/s |
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normal nerve conduction amplitude is ___ in sensory fibers, ___ in motor.
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10 uV
6 mV |
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___ is the most distal muscle innervated by the median nerve
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abductor pollicis brevis
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stimulation distal to a lesion gives a ___ reading, proximal to one gives a ___ reading.
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normal
low |
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2 causes of conduction block
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demyelination
compression |
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if no defect found on NCT, check ___
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F wave
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in GBS, F wave may be ___ (2)
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prolonged
absent |
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3 kinds of spontaneous activity on SFEMG
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fibrillations
positive sharp waves fasciculations |
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fibrillations are seen as ___ deflections, positive sharp waves as ___.
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upward (negative)
downward (positive) |
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fibrillations are ___ly timed
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irregularly
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2 causes of spontaneous activity on SFEMG
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denervation
inflammatory polymyopathy with necrosis |
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___ in SFEMG can be used to distinguish ___ from ___
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interference pattern
myopathy neurogenic problem |
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neurogenic problems are characterized by ___ (2) firing with ___ interference. spontaneous activity is present/absent.
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rapid
high amplitude reduced present |
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myopathic problems are characterized by ___ firing with ___ interference.
spontaneous activity is present/absent. NCT is usually ___ |
low amplitude
full absent (except inflammatory myopathy) normal |
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2 kinds of neurogenic problem
these are distinguishable via ___. |
demyelinating
axonal NCT |
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demyelinating problems have ___ distal latency, ___ conduction velocity, ___ amplitude, with/without dispersion and with/without conduction block.
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high
low normal with with |
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axonal problems have ___ distal latency, ___ conduction velocity, ___ amplitude, with/without dispersion and with/without conduction block.
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normal
normal low without without |
