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.