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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.