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Optic Nerve Sheath Point of Care Ultrasound: Image Acquisition

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Published on: August 18, 2023

Supraorbital nerve conduction study in normal subjects.

Aravindakannan Therimadasamy¹, Einar P Wilder-Smith, Aymeric Y T Lim

¹Neurology Diagnostic Laboratory, National University Hospital System, Singapore.

|March 21, 2012

Summary

This summary is machine-generated.

A new method measures supraorbital sensory nerve action potentials (SNAPs), enabling direct assessment of nerve function. This technique provides quantitative data for supraorbital nerve conduction velocity and amplitude in healthy individuals.

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Published on: September 21, 2015

Area of Science:

Neuroscience
Clinical Electrophysiology

Background:

Direct measurement of supraorbital nerve conduction velocity and amplitude is currently unavailable.
Existing methods lack the ability to quantify supraorbital nerve function accurately.

Purpose of the Study:

To introduce a novel nerve conduction technique for measuring supraorbital sensory nerve action potentials (SNAPs).
To establish a quantitative method for assessing the functioning large fibers in the supraorbital nerve.

Main Methods:

An antidromic technique was employed to record supraorbital SNAPs bilaterally in 17 healthy volunteers.
Measurements were taken at a specific site 6 cm lateral to the midline, 10 cm above the nasion.
Key parameters recorded included peak latency, amplitude, and conduction velocity.

Main Results:

Supraorbital SNAPs were consistently recordable in all subjects.
Mean values obtained were: peak latency (2.3 ms), amplitude (14.6 μV), and conduction velocity (51.3 m/s).
Cut-off values for normal function were established for latency, amplitude, velocity, and interside amplitude difference.

Conclusions:

The novel technique reliably records supraorbital SNAPs in healthy individuals.
This method offers a quantitative assessment of supraorbital nerve function.
The findings provide normative data and cut-off values for clinical application.