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Supraorbital nerve conduction study in normal subjects
Author(s) -
Therimadasamy Aravindakannan,
WilderSmith Einar P.,
Lim Aymeric Y.T.,
Yap Yan Lin,
Yeo Matthew,
Naidu Shenthilkumar,
Lee Shu Jin
Publication year - 2012
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/mus.23237
Subject(s) - supraorbital nerve , antidromic , anatomy , nerve conduction velocity , snap , median nerve , medicine , nasion , electrophysiology , anesthesia , computer graphics (images) , reflex , corneal reflex , computer science
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. Muscle Nerve, 2012