Key result
A novel capacitive electrode achieved up to 99.8% correlation between RRIs extracted from an ECG and a CECG signal, outperforming two counterpart electrodes (52% and 63%).
Why the study?
Capacitive electrocardiograms (CECG) have long been known to be susceptible to ambient interference.
Absolute Event Rate: 99.8% vs 52%
A novel capacitive electrode significantly improves noise resistance and signal correlation in noncontact ECG monitoring.
May advance noncontact ECG monitoring; leaves open prospective clinical validation.
For years, capacitive electrocardiogram (CECG) has been known to be susceptible to ambient interference. In light of this, a novel capacitive electrode was developed as an effective way to reduce the interference effect. This was done by simply introducing the capacitive elector in series with a 1 pF capacitor, and the 60 Hz common mode noise induced by AC power lines was cancelled using a capacitive right leg (CRL) circuit. The proposed electrode did as expected outperform two counterparts in terms of SNR, and particularly gave an up to 99.8% correlation between RRIs extracted from an ECG and a CECG signal, a figure far beyond 52% and 63% using the two counterparts. This capacitive electrode was originally designed for long-term noncontact monitoring of heart rate, and hopefully can be integrated to portable devices for other medical care services in the near future.
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Chen et al. (2020) studied this question. Novel capacitive electrode vs. Two counterpart electrodes was evaluated on Correlation between RRIs extracted from an ECG and a CECG signal. A novel capacitive electrode achieved up to 99.8% correlation between RRIs extracted from an ECG and a CECG signal, outperforming two counterpart electrodes (52% and 63%).
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