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Table 3 U/M CMAP ratio in patients with HD, ALS or CSA

From: Electrophysiological differences between Hirayama disease, amyotrophic lateral sclerosis and cervical spondylotic amyotrophy

  U/M CMAP ratio
  <0.6 0.6-1.7 >1.7
HD Affected limb 62 28 10
  Healthy limb 0 78 0
ALS Affected limb 3 54 33
  Healthy limb 0 37 0
CSA Affected limb 1 27 2
  Healthy limb 0 22 0
Normal controls Healthy limb 0 35 0
  1. HD, Hirayama disease; ALS, amyotrophic lateral sclerosis; CSA, cervical spondylotic amyotrophy; CV, conduction velocities; U/M, ulnar/median; CMAP, compound muscle action potential.