The efficacy of a homemade headcap for use with cup electrodes ...
The efficacy of a homemade headcap for use with cup electrodes ...
The efficacy of a homemade headcap for use with cup electrodes ...
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Songkla Med J Homemade <strong>headcap</strong> <strong>for</strong> EEG recording<br />
Vol. 23 No. 1 Jan.-Feb. 2005 5<br />
Ovartlarnporn S, Setthawatcharawanich S.<br />
Table 2 (continued)<br />
Discussion<br />
Our study showed that the per<strong>for</strong>mance <strong>of</strong> our <strong>homemade</strong><br />
<strong>headcap</strong> was comparable to that <strong>of</strong> the Medelec R<br />
model. <strong>The</strong> number <strong>of</strong> EM and EP were similar <strong>with</strong> both<br />
<strong>headcap</strong>s and no artifacts due to these phenomena were<br />
detected. <strong>The</strong> <strong>homemade</strong> <strong>headcap</strong> produced less EM during<br />
the intermittent photic stimulation procedure than the Medelec<br />
R model. Since the intermittent photic stimulation procedure<br />
was done at the last period <strong>of</strong> awake EEG recording, the EM<br />
may be more likely to occur due to the patient's decreased<br />
level <strong>of</strong> cooperation beca<strong>use</strong> <strong>of</strong> fatigue or discom<strong>for</strong>t from the<br />
prolonged recording. <strong>The</strong> less frequent EM in the <strong>homemade</strong><br />
<strong>headcap</strong> may signify that it holds the <strong>electrodes</strong> more firmly<br />
than the Medelec R model. EP during hyperventilation<br />
recording was higher in the <strong>homemade</strong> <strong>headcap</strong> <strong>with</strong> marginal<br />
statistical significance. However, the number <strong>of</strong> the patients<br />
in this study was small so further study <strong>with</strong> a larger number<br />
<strong>of</strong> patients is mandatory be<strong>for</strong>e any conclusion regarding these<br />
points can be drawn. <strong>The</strong> cost <strong>of</strong> our <strong>homemade</strong> <strong>headcap</strong> is<br />
about 150 baht and it can be <strong>use</strong>d <strong>for</strong> approximately 6 months.<br />
This is much cheaper than the commercial one. We believe<br />
that our <strong>headcap</strong>, which can be made anywhere, is cost effective<br />
particularly in the regions where cost is the important<br />
issue.<br />
Group A Group B Remarks 95% CI<br />
Electrode popping mean ± SD mean ± SD<br />
Awake recording 0.45 ± 0.83 0.50 ± 1.47 ns -0.81-0.71<br />
Hyperventilation recording 0.65 ± 1.04 0.15 ± 0.37 p = 0.05 0.001-0.99<br />
Post hyperventilation recording 0.55 ± 1.10 0.45 ± 1.00 ns -0.57-0.77<br />
Intermittent Photic stimulation recording 0.10 ± 0.45 0.05 ± 0.22 ns -0.17-0.27<br />
Sleep recording 0.30 ± 0.66 0.50 ± 1.24 ns -0.83-0.43<br />
Total recording time (hour) 2.0 ±<br />
±<br />
± .00 1.95 ± 0.22 ns -0.51-0.15<br />
Conclusion<br />
Our study showed that the per<strong>for</strong>mance <strong>of</strong> our <strong>homemade</strong><br />
<strong>headcap</strong> was comparable to that <strong>of</strong> Medelec R model.<br />
<strong>The</strong> number <strong>of</strong> EM and EP were similar <strong>with</strong> both <strong>headcap</strong>s<br />
and no artifacts due to these phenomena were detected. <strong>The</strong><br />
cost <strong>of</strong> our <strong>homemade</strong> <strong>headcap</strong> is low <strong>with</strong> durability <strong>of</strong> 6<br />
months. It can be made anywhere and is suitable in any<br />
region <strong>with</strong> cost consciousness.<br />
References<br />
1. Ovartlarnporn S. Homemade <strong>headcap</strong> <strong>for</strong> EEG scalp<br />
electrode made from inexpensive materials. Abstract<br />
presented at the annual academic meeting <strong>of</strong> the Faculty<br />
<strong>of</strong> Medicine, Prince <strong>of</strong> Songkla University. August 19-<br />
21 1998.<br />
2. Clenny SL, Johnson SM. Electrodes and their application.<br />
In Back to Basics: a Handbook <strong>of</strong> EEG Technology.<br />
Beckman Instruments; 1983;5-16.<br />
3. Niedermeyer E. Sleep and EEG. In: Niedermeyer E,<br />
Da Silva FL. editors. Electroencephalography Basic<br />
Principles, Clinical Applications, and Related Fields.<br />
3 rd ed. Philadelphia: Williams & Wilkins; 1993;153-<br />
66.<br />
4. Reilly EL. EEG recording and operation <strong>of</strong> the apparatus.<br />
In: Niedermeyer E, Da Silva FL. editors. Electroencephalography<br />
Basic Principles, Clinical Applications,<br />
and Related Fields. 3 rd ed. Philadelphia: Williams &<br />
Wilkins; 1993;104-24.