Water-soluble adhesive for stable long-term ambulatory EEG recordings.

Objective: Conventional methods used to adhere EEG electrodes are often uncomfortable. Here, we present a polymer-based water-soluble EEG adhesive that can be maintained for up to 6 days. The primary outcome measure of this study is the median electrode impedance at day 6.

Methods: Impedance measurements for 841 EEG recordings using a 21 channel 10-20 configuration were remotely logged daily for 6 days after connection. A novel electrode adhesive was used to attach EEG electrodes. Patients were instructed to maintain their electrodes on day 4.

Results: Median electrode impedances were significantly below 10kOhms for each day of recording, with a median value on day 6 of 4.18kOhms. Impedance values were significantly lower on day 5 than on day 4, demonstrating that the maintenance process can reduce impedance. Except for day 4-5, the median impedance increased each day. No significant difference was found on the first or final day between clinics or residences from areas of different geographic remoteness.

Conclusions: EEG is able to be recorded in patients homes for 6 days with acceptable impedance and no significant effect of regionality or patients age.

Significance: To the best of our knowledge, this is the first report in the literature of impedance data from long-term ambulatory EEG studies.