Screen-printed EEG electrode set for emergency use

Lepola, Pasi; Myllymaa, Sami; Töyräs, Juha; Muraja-Murro, Anu; Mervaala, Esa; Lappalainen, Reijo; Myllymaa, Katja

doi:10.1016/j.sna.2014.03.029

Cited by 37 publications

(38 citation statements)

References 16 publications

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“…The authors have recently introduced a disposable forehead EEG electrode set suitable for rapid and simple use in acute neurological emergency settings (Lepola et al ., ; Myllymaa et al ., ). Its usefulness has been demonstrated clinically when excluding status epilepticus in acute neurological patients with unexplained altered mental state (Muraja‐Murro et al ., ).…”

Section: Introductionmentioning

confidence: 99%

Assessment of the suitability of using a forehead EEG electrode set and chin EMG electrodes for sleep staging in polysomnography

Myllymaa

Muraja-Murro

Westerén-Punnonen

et al. 2016

Journal of Sleep Research

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Summary Recently, a number of portable devices designed for full polysomnography at home have appeared. However, current scalp electrodes used for electroencephalograms are not practical for patient self‐application. The aim of this study was to evaluate the suitability of recently introduced forehead electroencephalogram electrode set and supplementary chin electromyogram electrodes for sleep staging. From 31 subjects (10 male, 21 female; age 31.3 ± 11.8 years), sleep was recorded simultaneously with a forehead electroencephalogram electrode set and with a standard polysomnography setup consisting of six recommended electroencephalogram channels, two electrooculogram channels and chin electromyogram. Thereafter, two experienced specialists scored each recording twice, based on either standard polysomnography or forehead recordings. Sleep variables recorded with the forehead electroencephalogram electrode set and separate chin electromyogram electrodes were highly consistent with those obtained with the standard polysomnography. There were no statistically significant differences in total sleep time, sleep efficiency or sleep latencies. However, compared with the standard polysomnography, there was a significant increase in the amount of stage N1 and N2, and a significant reduction in stage N3 and rapid eye movement sleep. Overall, epoch‐by‐epoch agreement between the methods was 79.5%. Inter‐scorer agreement for the forehead electroencephalogram was only slightly lower than that for standard polysomnography (76.1% versus 83.2%). Forehead electroencephalogram electrode set as supplemented with chin electromyogram electrodes may serve as a reliable and simple solution for recording total sleep time, and may be adequate for measuring sleep architecture. Because this electrode concept is well suited for patient's self‐application, it may offer a significant advancement in home polysomnography.

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Section: Introductionmentioning

confidence: 99%

Assessment of the suitability of using a forehead EEG electrode set and chin EMG electrodes for sleep staging in polysomnography

Myllymaa

Muraja-Murro

Westerén-Punnonen

et al. 2016

Journal of Sleep Research

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“…The quick progress made in EEG measurement systems, including the wireless and computational properties, have made it easier to apply online analysis even in a demanding clinical environment. Recently, a disposable forehead electrode set suitable for the ICU was launched and claimed to have excellent signal quality [21,22]. These advances in the recording instruments make it possible for easy EEG data acquisition at the ICU and thus promote the development and improvement of algorithms for signal analysis providing diagnostic and prognostic information.…”

Section: Discussionmentioning

confidence: 99%

Forehead electrodes sufficiently detect propofol-induced slow waves for the assessment of brain function after cardiac arrest

Kortelainen

Väyrynen²,

Juuso³

et al. 2019

J Clin Monit Comput

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In a recent study, we proposed a novel method to evaluate hypoxic ischemic encephalopathy (HIE) by assessing propofolinduced changes in the 19-channel electroencephalogram (EEG). The study suggested that patients with HIE are unable to generate EEG slow waves during propofol anesthesia 48 h after cardiac arrest (CA). Since a low number of electrodes would make the method clinically more practical, we now investigated whether our results received with a full EEG cap could be reproduced using only forehead electrodes. Experimental data from comatose post-CA patients (N = 10) were used. EEG was recorded approximately 48 h after CA using 19-channel EEG cap during a controlled propofol exposure. The slow wave activity was calculated separately for all electrodes and four forehead electrodes (Fp1, Fp2, F7, and F8) by determining the low-frequency (< 1 Hz) power of the EEG. HIE was defined by following the patients' recovery for six months. In patients without HIE (N = 6), propofol substantially increased (244 ± 91%, mean ± SD) the slow wave activity in forehead electrodes, whereas the patients with HIE (N = 4) were unable to produce such activity. The results received with forehead electrodes were similar to those of the full EEG cap. With the experimental pilot study data, the forehead electrodes were as capable as the full EEG cap in capturing the effect of HIE on propofol-induced slow wave activity. The finding offers potential in developing a clinically practical method for the early detection of HIE.

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“…Hydrogel-coated electrodes and chin EMG cup electrodes were prepared only by cleaning the attachment site with ethanol-soaked cotton pads in order to simulate the skin preparing in home environment for AES. This has been shown to result in adequate electrode-skin contact with impedance in the range of tens of kilo-ohms, enabling high-quality recordings with modern bioamplifiers (Lepola et al, 2014). The EEG, EOG, EMG and ECG channels were recorded with a sampling rate of 500 Hz.…”

Section: Data Acquisitionmentioning

confidence: 99%

“…There is a need for a valid, reliable, widely available and cost-efficient method for ambulatory SB diagnostics (Lobbezoo et al, 2013). Recently, the authors have introduced a silver ink screen-printed and hydrogel-coated electrode set (Lepola et al, 2014) for emergency assessment of EEG in patients with altered mental state (Muraja-Murro et al, 2015). The electrode set is easy and quick to attach to the skin (Lepola et al, 2014), and it is also suitable for assessment of TST by sleep stage scoring (Myllymaa et al, 2016).…”

mentioning

confidence: 99%

“…Recently, the authors have introduced a silver ink screen-printed and hydrogel-coated electrode set (Lepola et al, 2014) for emergency assessment of EEG in patients with altered mental state (Muraja-Murro et al, 2015). The electrode set is easy and quick to attach to the skin (Lepola et al, 2014), and it is also suitable for assessment of TST by sleep stage scoring (Myllymaa et al, 2016). The set includes electrodes placed near masseter muscles, generally used for RMMA recognition (Carra et al, 2012;Lavigne et al, 1996).…”

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confidence: 99%

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Screen‐printed ambulatory electrode set enables accurate diagnostics of sleep bruxism

Miettinen

Myllymaa

Muraja-Murro

et al. 2017

Journal of Sleep Research

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SUMMARYCurrently, definite diagnosis of sleep bruxism requires polysomnography. However, it is restrictedly available, and too cumbersome and expensive for the purpose. The aim of this study was to introduce an ambulatory electrode set and evaluate its feasibility for more cost-effective diagnostics of sleep bruxism. Six self-assessed bruxers (one male, five females; aged 21-58 years) and six healthy controls (four males, two females, aged 21-25 years) underwent a standard polysomnographic study and a concurrent study with the ambulatory electrode set. Bruxism events, cortical arousals and sleep stages were scored for the two montages separately in a random order, and obtained sleep parameters were compared. In addition, the significance of video recording and sleep stage scoring for the diagnostic accuracy of ambulatory electrode set was determined. Ambulatory electrode set yielded similar diagnoses as standard polysomnography in all subjects. However, compared with standard polysomnography the median (interquartile range) tonic bruxism event index was significantly higher in the control group [+0.38 (+0.08 to +0.56) events per hour, P = 0.046], and the phasic bruxism event index was significantly lower in the bruxer group [À0.44 (À1.30 to +0.07) events per hour, P = 0.046]. Exclusion of video recording and both video recording and sleep stage scoring from analysis increased overestimation of the tonic bruxism event index in the control group +0.86 (+0.42 to +1.03) and +1.19 (+0.55 to +1.39) events per hour, P = 0.046 and P = 0.028, respectively], resulting in one misdiagnosed control subject. To conclude, ambulatory electrode set is a sensitive method for ambulatory diagnostics of sleep bruxism, and video recording and sleep stage scoring help reaching the highest specificity of sleep bruxism diagnostics.

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Screen-printed EEG electrode set for emergency use

Cited by 37 publications

References 16 publications

Assessment of the suitability of using a forehead EEG electrode set and chin EMG electrodes for sleep staging in polysomnography

Assessment of the suitability of using a forehead EEG electrode set and chin EMG electrodes for sleep staging in polysomnography

Forehead electrodes sufficiently detect propofol-induced slow waves for the assessment of brain function after cardiac arrest

Screen‐printed ambulatory electrode set enables accurate diagnostics of sleep bruxism

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