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Nerve Conduction Studies

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Topic updated on 11/08/12 4:02pm
Introduction
  • Often the only objective evidence of a compressive neuropathy (valuable in workcomp patients with secondary gain issues)
  • Indications
    • carpal tunnel syndrome
    • cubital tunnel syndrom
    • cervical radiculopathy
    • lumbar radiculopathy
    • nerve dysfunction of the shoulder (e.g., scapular winging)
Nerve Conduction Velocity
  • Nerve demyelinatoin leads to 
    • increase latencies (slowing) of NCV  
      • distal sensory latency of > 3.2 ms are abnormal for CTS
      • motor latencies > 4.3 ms are abnormal for CTS
    • decreased conduction velocities less specific that latencies
      • velocity of < 52 m/sec is abnormal
EMG
  • Test the electrical activity of individual muscle fibers and motor units
  • Detail insertional and spontaneous activity
  • Potential patholgic findings
    • decreased insertional activity
    • sharp waves
    • fibrillations
    • fasciculations
    • complex repetitive discharges 

 

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