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Electrophysiology
EMG review
| Question | Answer |
|---|---|
| What is normal for phases of a MUP? | 2-3 phases |
| What is the normal duration of a MUP? | 3-12 millisec |
| What is the normal amplitude for a MUP? | 300-10,000 micorvolts |
| If the amplitude of a MUP is >10 millivolts(10,000 micovolts) then the problem may be ________. | neuropathic |
| If the duration of a MUP is > 15 millisec then the problem may be _________. | neuropathic |
| If there are >5 phases then there may be a _______ or _________ problem. | neuropathic or mypathic |
| If the duration of a MUP is <3 millisec then the problem is _______. | myopathic |
| If the amplitude is <300 microvolts then the problem is __________. | myopathic |
| Long phase duration, high amplitude, and polyphasic decribes what type of problem?(neuropathic or myopathic) | neuropathic |
| short phase duration, low amplitude, and polyphasic describes what type of problem? | myopathic |
| Signs of denervation include? | increased or absent(if chronic) insertional activity, fibrilations, positive wavs, polyphasic, >15 millisec duration, >10millivolts amp, max contraction decreased |
| What is the normal value for insertional activity? | < 200 msec |
| At rest the isoelectric line should typically be ________. | silent |
| What are examples of normal spontaneous activity that my result in "noise" during rest? | MEPP(miniature endplate potential), and endplate potentials |
| release of single quanta of Ach at NMJ, Short duration, low amplitude all describe what? | MEPP |
| non-propogated potentials originating in the NMJ, needle in NMJ, longer duration, much higher amplitude describe what? | endplate potentials |
| What are examples of abnormal spontaneous activity at rest? | fibrilation potentials, positive sharp waves, myotonic discharges, and fasiculations |
| Spontaneous contraction of a single muscle fiber, Origin = Axonal denervation/unstable mm membrane, Sound like clicking or manual typewriter....describes what? | fibrillation potentials |
| Axonal degeneration occurs at ___ mm/hour for the first ___ days post nerve injury. | 2mm/3days |
| If fibrillation potential is present how many days must you wait before performing an EMG? | 21 |
| 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 |
| Bursts of discharging potentials that WAX and WANE, Sound: divebomber, chainsaw, Observed only in myotonias!...what is this? | myotonic discharge |
| 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 |
Created by:
txst spr 2009
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