Which 3 abnormal spontaneous potentials arise from single muscle fibers
fibs, sharps, mytonic
This waveform was seen in the TFL during EMG in a 60 y.o. what is the likely diagnosis? acute radiculopthy, chronic radiculopathy, myopathy,
myopathy
A 24 year old student has persistent low back pain and left calf weakness after a fall 3 weeks ago. You suspect S1 radiculopathy. Name 3 muscles will likely show denervations
paraspinals, gastroc, hamstrings, gluts, TFL
Describe 3 characteristics of a typical H-reflex testing and response ( stim intensity/duration, waveform consistency)
submax, long duration, consistent waveform morphology and motor
How can fibrillation potentials be differentiated from end-plate-spikes
Fibrillation as initial downward (positive) deflection and end plate spikes have initial negative deflection
What happens to the waveform when you reduce the high frequency filter from 10 KHz to 5 KHz
reduce onset, reduce peak onset, reduce amplitude
Which 3 muscles are supplied by the anterior Interosseous Nerve
FDP (lateral half), FPL, pronator quadratus
Facial Myokymia is most likely seen in which disorder?
post radiation plexopathy , brain stem lesion, MS, thyroid toxicosis
This is seen with LEFT side stim. What is the diagnosis?
R CN 7 pathology
This wave is waxing and waning and noted in the various proximal upper and lower extremities of a 20 y.o muscular man who denies signficant weakness. What is the most likely diagnosis
myotonia congenita, Herculean
Which part of the NCS waveform is useful for calculating conduction velocity ( phases, amplitude, peak latency, onset latency)
onset latency
EMG testing of which muscle can help you differentiate ulnar compression at the cubital tunnel vs injury at the plexus
FCU
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