Welcome to our EMG / NCS Review Flashcards! Understanding is paramount, but unfortunately, one aspect of academic success does rely on simple memorization and repetition. In our neurology flashcards feature, we have taken the most commonly seen rote memory topics and “buzzwords” from neurology board and RITE* exams and made easy to use flashcards. These work on desktop, tablet, and mobile devices.

Compound Motor Action Potentials (CMAPs)
The summated response of individual muscle fiber action potentials.
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Conduction velocity
The speed of the fastest conducting motor axons in the stimulated nerve. Prolonged in demyelinating disorders due to loss/impairment of saltatory conduction.
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EMG insertional activity finding in muscle necrosis
Decreased activity
Also seen during episodes of periodic paralysis.
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Increased EMG insertional activity is seen with...
Neuropathic (denervation) or myopathic (myotonic) processes
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Fibrillations and positive waves
A rhythmic firing of individual muscle fibers representing active denervation or muscle inflammation. Seen 7-10 days after onset of the injury.
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Fasciculations
Irregular spontaneous firing of a motor neuron at rest. "Popcorn popping" sound on EMG. When they are frequent, they can represent acute muscle denervation. Widespread fasciculations involving can be seen in motor neuron disease (ALS), benign fasciculation syndrome, and cramp fasciculation syndrome.
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Disorders of increased and decreased recruitment
Increased/early/rapid recruitment is seen in myopathy Decreased recruitment is seen in disorders involving axon loss/damage.
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EMG findings in chronic neuropathic lesions
High amplitude, polyphasic MUAPs with increased duration, decreased recruitment (low number of firing motor units per applied force) and increased firing rate.
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