Supraorbital nerve conduction study in normal subjects

Abstract

There is currently no examination technique that allows direct measurement of supraorbital nerve conduction velocity and amplitude. Therefore, in this study we describe a novel nerve conduction technique that allows measurement of the supraorbital sensory nerve action potential (SNAP) distal to the supraorbital foramen. Supraorbital SNAPs were recorded bilaterally from 17 healthy volunteers using an antidromic technique. The SNAPs were consistently recordable over the site 6 cm lateral to the midline point that was marked 10 cm above the nasion. Measured parameters included peak latency (mean 2.3 ms, SD 0.3), amplitude (mean 14.6 μV; SD 10.5), and velocity (mean 51.3 m/s, SD 6.8). The mean percentage of interside difference in amplitude was 25.6% (SD 17.3). Cut-off values (97th percentile) were 2.7 ms (peak latency), 3.3 μV (amplitude), 41.9 m/s (conduction velocity), and 54.9% (interside difference in amplitude). Supraorbital SNAPs can be recorded in all normal subjects and used as a quantitative measure of the functioning large fibers in the nerve.

Electrophysiological characteristics of the frontal nerve in patients with herpetic ophthalmic neuralgia

“…The onset latency and amplitudes of the SNAPs from the STN and SONs were slightly, but not significantly, different on both the right and left sides and between females and males (Table ). In our study, the SCVs of both the SON‐s and SON‐d were lower than those reported by Therimadasamy et al and Cruccu et al, but similar to the results reported by Jandolo et al…”

“…In previous studies, the SNAPs obtained with a single‐channel method did not clearly reflect the overall features of the nerves of the forehead. The major finding in this study was the use of 3 channels to obtain serial SNAPs of the SONs and STN to evaluate the frontal nerve.…”

Whole plantar nerve conduction study with disposable strip electrodes

“…The normal values are shown in Table . The side‐to‐side difference in amplitude was calculated as a percentage using the following formula: absolute difference in amplitude×100 / maximal amplitude . The mean side‐to‐side difference in amplitude was 16.4 ± 9.8%.…”

A novel method to measure sensory nerve conduction of the supraclavicular nerve

“…Normal values for our subjects are shown in Table S1 (refer to Supplementary Material available online). The side‐to‐side difference in amplitude was calculated as a percentage using the following formula: absolute difference in amplitude × 100/maximal amplitude . The mean side‐to‐side difference in amplitude was 12.9 ± 11.0%, and the 97th percentile cutoff value was 34.6%.…”