Dear Hoover
This posting is of general interest.
Can you please post it on CV-Net, TU, Vaegan
A note for clinical electrophysiologists.
Some time ago Neuroscan sent an add through the list for a new product called
Quik-Gel which was an electrode application paste which, it was claimed,
"Did not require abrasion" presumably to achieve similar impedences to
pastes which did. I have run an experiment to thest this product and found
it does not live up to the claim. I have sent a report to neuroscan
in response to their survey of people who sent for a sample. The report
to them was as follows
I compared patients where both eyes were being set up for EOG recording.
one eye at random was treated with quik-gel and the other with omni prep.
a clean cotton wool swap was used for each paste. all other procedures
were identical. I used gold cup electrodes with Nikoh Koden Elfix paste.
Impedence of each pair was mesured with the Chris Hogg metre at 10Hz
In a series of 12 cases the omniprep impedence was always less than 3Kohms.
Quik-Gel was 2.5-8Kohms. 5 cases were over 5Kohms. In each paired
comparison the Oniprep impedence was always lower. They only came close
(verging on equal) once.
The probability of the result I got being by chance (binomial) is 1/2^12 or
1/4096 i.e. P about .0002.
After the Quik gel electrodes were removed and the area recleaned and
treated with omniprep, the two pairs became equal. The quik gel site was
no better by being treated with it first.
Quik-Gel made the skin slimy and slippery so the Elfix would not hold well.
The only uses I can see for Quik Gel are hysterical children or old people
with thin sensitive skin. It has no other advantages.
The company should have done this research for itself and not sent such
false advertising out over the net.
Has anyone else tried this stuff? If so please post your results.
Yrs truly
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