Early Aggressive Immunotherapy Improves Functional Outcome in Chronic Immune Sensory Polyradiculopathy
Table 3
Initial and repeat (performed 4 months apart) nerve conduction study parameters.
Sensory nerve conduction
Right median nerve (antidromic)
Right ulnar nerve (antidromic)
Initial
Repeat
Normal limit∗
Initial
Repeat
Normal limit
Peak latency (ms)
3.6
3.2
<3.9
3.0
3.0
<3.0
Amplitude (µV)
35
26
>14
20
23
>9.0
Velocity (m/s)
50
55
>50
50
51
>50
Right sural (antidromic)
Initial
Repeat
Normal limit∗
Peak latency (ms)
3.8
3.7
<4.5
Amplitude (µV)
7
8
>7.0
Velocity (m/s)
48
49
>40
Motor nerve conduction^
Right median nerve (antidromic)
Right ulnar nerve (antidromic)
Initial
Repeat
Normal limit∗
Initial
Repeat
Normal limit∗
Distal latency (ms)
3.7
—
<4.5
2.9
—
<3.0
Amplitudes (mV) (distal/proximal)
7.7/6.6#
—
>5.5
11.1/9.5#
—
>7.0
Velocity (m/s)
50
—
>50
56
—
>50
F-wave latency (ms)
26.2
—
22–32
27.4
—
21–29
Right tibial nerve (antidromic)
Initial
Repeat
Normal limit∗
Distal latency (ms)
4.6
—
<4.6
Amplitudes (mV) (distal/proximal)
8.7/7.9#
—
>5.0
Velocity (m/s)
40
—
>42
F-wave latency (ms)
47.8
—
38–52
∗Normative data derived from 245 age-height matched controls; #measurements following stimulation at the wrist/antecubital fossa for median nerve, at the wrist/above elbow for ulnar nerve, and at the ankle/popliteal fossa for tibial nerve; ^repeat motor nerve conduction study was not performed as the patient had no motor deficits.
