Table 1: Neurophysiology results for both patients.

Nerve (N) / other details

Case 1

Case 2

NCS 1

NCS 2

NCS 1

NCS 2

R

L

R

L

R

L

R

L

 

 

 

 

 

 

 

 

 

 

 

RADIAL N: wrist-forearm SNAP

9.9 uV

5.0 uV

NR

-

15.1 uV

4.3 uV

13.6 mV

4.8 mV

 

MEDIAN N: F3-wrist SNAP

4.5 uV

1.7 uV

10.2 mV

10.6 mV

NR

2.6 uV

NR

NR

 

ULNAR N: F5-wrist SNAP

0.9 uV

NR

NR

NR

NR

2.5 uV

NR

1.8 uV

 

SURAL N: calf-ankle SNAP

NR

NR

NR

NR

2.1 uV

2.5 uV

3.5 uV

NR

 

SUP PERONEAL N: calf-ankle SNAP

NR

NR

NR

NR

NR

1.5 uV

6.6 uV

NR

 

 

 

 

 

 

 

 

 

 

 

MEDIAN N: DML

3.6 ms

3.0 ms

3.3 ms

3.2 ms

6.7 ms

3.3 ms

NR

3.8 ms

 

MEDIAN N: wrist CMAP (APB)

6.1 mV

9.9 mV

8.4 mV

13.0 mV

0.3 mV

8.1 mV

NR

10.8 mV

 

MEDIAN N: elbow-wrist CV

49 m/s

53 m/s

43 m/s

50 m/s

NR

50 m/s

NR

51 m/s

 

MEDIAN N: elbow CMAP (APB)

5.5 mV

12.6 mV

7.2 mV

10.2 mV

NR

7.1 mV

NR

8.9 mV

 

MEDIAN N: axilla-elbow CV

-

-

-

58 m/s

-

52 m/s

-

14 m/s

 

MEDIAN N: axilla CMAP (APB)

-

-

-

8.9 mV

-

4.4 mV

-

3.4 mV

 

 

 

 

 

 

 

 

 

 

 

ULNAR N: DML

NR

3.2 ms

NR

5.0 ms

3.0 ms

2.5 ms

4.0 ms

3.4 ms

 

ULNAR N: wrist CMAP (ADM)

NR

0.5 mV

NR

1.7 mV

3.0 mV

11.8 mV

1.0 mV

9.7 mV

 

ULNAR N: elbow-wrist CV

-

51 m/s

-

51 m/s

61 m/s

53 m/s

48 m/s

51 m/s

 

ULNAR N: elbow CMAP (ADM)

-

0.4 mV

-

1.9 mV

2.1 mV

8.8 mV

1.4 mV

7.6 mV

 

ULNAR N: around elbow CV

-

48 m/s

-

69 m/s

56 m/s

56 m/s

45 m/s

48 m/s

 

ULNAR N: above elbow CMAP (ADM)

-

0.4 mV

-

2.0 mV

2.3 mV

8.2 mV

1.0 mV

7.2 mV

 

ULNAR N: axilla-above elbow CV

-

-

-

-

48 m/s

57 m/s

47 m/s

38 m/s

 

ULNAR N: axilla CMAP (ADM)

-

-

-

-

2.2 mV

6.1 mV

1.4 mV

5.3 mV

 

ULNAR N: F-wave

NR

31 ms

-

-

21.7 ms

37.5 ms

NR

39.4 ms

 

ADM: Abductor Digiti Minimi; APB: Abductor Pollicis Brevis; CMAP: Compound Muscle Action Potential; CV: Conduction Velocity; DML: Distal Motor Latency; NCS: Nerve Conduction Study; SNAP: Sensory Nerve Action Potential. There was severe asymmetric distal axonal damage evident in case 1, but no demyelination (except for a prolonged left ulnar distal motor latency on the 2nd study). In case 2, the prolonged right median distal motor latency on the first study is attributable to axonal loss, not demyelination (bold type), but there was a prolonged left ulnar F wave (bold type); more consistent demyelination was seen in the 2nd study plus clear left median conduction block (bold type). Lower limb motor studies were performed but contributed less, so they were not displayed here.