EMG review
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each of the black spaces below before clicking
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| What is normal for phases of a MUP? | 2-3 phases
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| What is the normal duration of a MUP? | 3-12 millisec
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| What is the normal amplitude for a MUP? | 300-10,000 micorvolts
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| If the amplitude of a MUP is >10 millivolts(10,000 micovolts) then the problem may be ________. | neuropathic
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| If the duration of a MUP is > 15 millisec then the problem may be _________. | neuropathic
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| If there are >5 phases then there may be a _______ or _________ problem. | neuropathic or mypathic
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| If the duration of a MUP is <3 millisec then the problem is _______. | myopathic
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| If the amplitude is <300 microvolts then the problem is __________. | myopathic
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| Long phase duration, high amplitude, and polyphasic decribes what type of problem?(neuropathic or myopathic) | neuropathic
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| short phase duration, low amplitude, and polyphasic describes what type of problem? | myopathic
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| Signs of denervation include? | increased or absent(if chronic) insertional activity, fibrilations, positive wavs, polyphasic, >15 millisec duration, >10millivolts amp, max contraction decreased
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| What is the normal value for insertional activity? | < 200 msec
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| At rest the isoelectric line should typically be ________. | silent
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| What are examples of normal spontaneous activity that my result in "noise" during rest? | MEPP(miniature endplate potential), and endplate potentials
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| release of single quanta of Ach at NMJ, Short duration, low amplitude all describe what? | MEPP
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| non-propogated potentials originating in the NMJ, needle in NMJ, longer duration, much higher amplitude describe what? | endplate potentials
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| What are examples of abnormal spontaneous activity at rest? | fibrilation potentials, positive sharp waves, myotonic discharges, and fasiculations
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| Spontaneous contraction of a single muscle fiber, Origin = Axonal denervation/unstable mm membrane, Sound like clicking or manual typewriter....describes what? | fibrillation potentials
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| Axonal degeneration occurs at ___ mm/hour for the first ___ days post nerve injury. | 2mm/3days
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| If fibrillation potential is present how many days must you wait before performing an EMG? | 21
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| Biphasic, positive-negative potential Origin = Axonal loss/unstable mm membrane, Observed in denervated muscles, polymyositis, dermatomyositis, progressive muscular dystrophy and motor neuron diseases, Often found with fibs Sound: thud,plop..describes | positive sharp waves
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| Bursts of discharging potentials that WAX and WANE, Sound: divebomber, chainsaw, Observed only in myotonias!...what is this? | myotonic discharge
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| Origin: spontaneous contraction of a group of muscle fibers representing either an entire MUAP or part of a MUAP, sound: pop, Indicates involvement of motor axons, Site of pathology is unknown, MAY BE FOUND IN NORMAL MUSCLE...what is this describing? | fasiculations
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Created by:
txst spr 2009
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