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19 Cards in this Set
- Front
- Back
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What are the 3 classification systems regarding nerve damage?
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-Seddon
-Sunderland -House-Brackmann |
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How many classes are in the Seddon classification system of nerve injury? What are they? which is worst?
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3
-Neuropraxia - mildest -Axonotmesis -Neurotmesis - worst |
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What are the Seddon class divisions based on?
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Destruction of nerve continuity
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What is Neuropraxia?
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Interruption in impulse conduction down the nerve fiber
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What is the usual result of neuropraxia?
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Recovery without wallerian degeneration
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What is the average time frame for recovery of function after neuropraxia?
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6-8 weeks
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What type of nerve fibers tend to be involved more in neuropraxia; motor or sensory?
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Motor - sensory and autonomic function tend to be retained
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What seems to be the cause of neuropraxia usually?
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Compression/concussion
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What is Axonotmesis? What is disrupted vs preserved?
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-Relative loss of axon continuity
-Myelin is disrupted -Epineurium/perineurium not |
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What is the result of lost axon continuity in Axonotmesis?
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Wallerian degeneration
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What test shows wallerian degeneration and how?
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EMG - 2-3 wks later; fibrillation and denervation potentials in musculature distal to the nerve injury
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What type of injury generally causes axonotmesis?
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Crush/contusion
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Which lesion tends to grow faster in healing of axonotmesis? What rate?
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Proximal lesion grows faster - 2-3mm per day
Distal lesion slower - 1.5 mm per day |
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How is Neurotmesis different from axonotmesis?
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There is not only loss of axon continuity but also perineurium and epineurium
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What is the deficit that results from neurotmesis?
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Complete loss of all motor, sensory, and autonomic function
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How many degrees of injury are in the Sunderland system?
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5 degrees
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What Seddon class does Sunderland's 1st degree correspond to?
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Neuropraxia
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What Seddon class does Sunderland's 2nd degree correspond to?
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Axonotmesis
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What Seddon class does Sunderland's 3-5th degrees correspond to?
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Neurotmesis
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