NA2-P. Nerve Lesions

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Author:
agatton
ID:
21844
Filename:
NA2-P. Nerve Lesions
Updated:
2010-06-03 00:19:59
Tags:
wccmt
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Description:
Injuries to peripheral nerves
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The flashcards below were created by user agatton on FreezingBlue Flashcards. What would you like to do?


  1. Neuropraxia
    (Seddon 1st degree)
    • Compression w/ local conduction block
    • No structural damage
    • Local demyelination
    • Motor loss only (sense+auto OK)
    • Prog: Good.
  2. Axononotmesis
    (Seddon 2nd degree)
    • Prolonged severe compression
    • Degen of axon distal to injury
    • Endoneural tube intact
    • Sense+Motor+Auto loss
    • Prog: Good (tube is intact to guide regrowth)
  3. Neurotmesis
    (Seddon 3rd degree)
    • Severance of part/all of trunk
    • Endoneural tube severed
    • Degen of NN
    • Scar tissue @ site prevents regen
    • Sense+Motor+Auto loss
    • Prog: Poor (no tube to guide regen)
  4. Neuritis
    • Inflammation of a NN
    • Affects sheath and CT, but not Axon
    • Constant dull pain
    • Parethesia/Dysthesia may be present
    • May have Motor+Sense loss if long duration
    • Causes: Trauma, chronic exposure to toxin (booze, drugs, lead), 2nd to pathology (diabetes, leprosy, TB)
  5. Neuralgia
    • No appeciable pathological changes
    • Recurrent attack of sudden pain along NN distribution
    • Causes: Local compression, trauma, inflammation, scar tissue, subluxed veretebra, prolonged exposure to cold
  6. Causalgia
    • Severe Pain syndrome
    • sudden onset
    • Persistent burning
    • Often due to trauma
    • Often incomplete w/ arterial injury
    • Cause: Bullets, surgery, injections, electrocution, amputation
  7. RSD/CRPS
    • Pain syndrome
    • Abnormal SNS reflex => arterial spasm
    • Spontaneous burning pain distal to NN injury, out of proportion to injury
    • Edema w/ dystrophic tissue
    • Pain increased by RoM/emotions
    • Warm+hyperemic or cool+pale
    • Sweating usually increased with MM wasting
    • "minor causalgia"
  8. Neuromas
    • Tumor composed of NN cells
    • Post partial/complete severance of NN
    • Random NN sprouts form random clumped masses
    • Sml+compact= lesspainful
    • large+soft= more painful
  9. Regeneration rates
    • Avg 10 days
    • 1-2mm per day, proximal side grows faster
    • Delay of 18 days to produce MM contraction
    • Can cause X-innervation (+mixed NNs)
    • Alcoholism/metal poisoning worsens prognosis
  10. Deep Tendon Reflex Grading
    • 0 - Absent
    • 1 - Diminished
    • 2 - Average (normal)
    • 3 - Exaggerated
    • 4 - Clonus or Very Brisk
  11. Reflex for the Jaw
    CNS Segment?
    C5
  12. Reflex for the Biceps
    CNS Segment?
    C5-6
  13. Reflex for the Triceps
    CNS Segment?
    C7-8
  14. Reflex for the Patella
    CNS Segment?
    L3-4
  15. Reflex for the Achilles
    CNS Segment?
    S1-2

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