Table 2.

Summary of nerve conduction data

Nerve conduction parameterNo. of patients
Additional material related to this data can be found on the Neurology Web site.
*Median, ulnar, peroneal, and posterior tibial nerves were tested.
† Median, ulnar, and sural nerves were tested.
‡ Median and ulnar nerves are tested.
§ Number and letters in parentheses represent patient number and nerve with abnormal nerve conduction.
¶In Patient 5, sural NCV was 22.7 m/s; in Patient 8, dispersion phenomenon was found in the I digital and I-II interdigital nerves of plantar nerves with the near-nerve needle sensory nerve conduction. NCV in the I digital nerve was 22.6 m/s and in the I-II interdigital nerve, 24.4 m/s.
NCS = nerve conduction study; CMAP = compound muscle action potential; NCV = nerve conduction velocity; NP = no potential; CNAP = compound nerve action potentials; PT = posterior tibial; U = ulnar; P = peroneal; M = median.
Abnormal NCS, n8
Abnormal motor nerve conduction*7
Prolonged terminal latency7
Slow NCV6
F-wave prolongation or NP7
Abnormal sensory nerve conduction8
No potential4
Slow NCV8
Low CNAP amplitude6
Abnormal mixed nerve conduction5
No potential1
Slow NCV4
Low CNAP amplitude4
Evidence of demyelination§
Sensory nerve conduction2 (5, 8)
Mixed nerve conduction0
Motor nerve conduction7 (except 8)
Abnormal temporal dispersion2 (PT in 3 & 7)
Conduction block3 (PT in 3 & 6; P in 7)
<60% of normal mean NCV2 (U in 2; PT in 6)
>150% of normal mean terminal latency7 (except 8)
>150% of normal mean F-wave latency2 (M in 2; all in 6)