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Table 2 Nerve conduction study in patients with CMT associated with mutation in MFN2

From: Charcot-Marie-Tooth neuropathy type 2A: novel mutations in the mitofusin 2 gene (MFN2)

 

Normal

1

2

3

4

5

6

Motor

       

   Median nerve

       

DML (ms)

≤ 3,9

2,8

3

 

3,8

5

 

NCV (m/s)

≥ 50

53

50

n.d.

46,2

56

n.d.

Amplitude (mV)

≥ 6

11,4

14,2

 

n.d.

11

 

   Peroneal nerve

       

DML (ms)

≤ 4,8

7,6

4

 

5,3

  

NCV (m/s)

≥ 42

37

45

not recordable

47,8

not recordable

not recordable

Amplitude (mV)

≥ 4

0,8

8,4

 

2

  

   Tibial nerve

       

DML (ms)

≤ 5,1

6,2

4,2

7,1

   

NCV (m/s)

≥ 41

31

36

38

n.d.

not recordable

not recordable

Amplitude (mV)

≥ 5

0,6

0,4

0,4

   

Sensory

       

   Median nerve

       

NCV (m/s)

≥ 47

60

54

n.d.

57,7

45

n.d.

Amplitude (mV)

≥ 7

13,4

11

 

n.d.

20

 

   Sural nerve

       

NCV (m/s)

≥ 41

34

not recordable

30

56,5

32

not recordable

Amplitude (mV)

≥ 10

7,2

 

1

n.d.

6

 
  1. DML= distal motor latency; NCV = nerve conduction velocity; n.d. = not determined.