Key result
A noncontact capacitive ECG system with a micro-humidity fabric electrode reduced skin-electrode impedance to 2.8 MΩ and achieved 98.12% accuracy for AF recognition.
Why the study?
Conventional ECG monitoring with wet electrodes can cause skin allergies, prompting the development of a noncontact capacitive ECG system for long-term AF monitoring.
Does a noncontact capacitive ECG system with a micro-humidity fabric electrode improve signal quality and accurately detect atrial fibrillation compared to conventional electrodes and reference equipment?
Does a noncontact capacitive ECG system with a micro-humidity fabric electrode improve signal quality and accurately detect atrial fibrillation compared to conventional electrodes and reference equipment?
Absolute Event Rate: 2.8% vs 104.1%
A novel noncontact capacitive ECG system using a micro-humidity fabric electrode significantly reduces skin-electrode impedance and accurately detects atrial fibrillation, offering a potential solution for comfortable, long-term AF monitoring.
May enable unobtrusive AF monitoring; leaves open validation in prospective clinical cohorts.
This study designed a novel noncontact capacitive Electrocardiogram (cECG) system for long-term atrial fibrillation (AF) monitoring. Unlike conventional ECG monitoring, the proposed system can record ECG signals without touching a subject’s skin, avoiding the problem of skin allergy by using wet electrodes. The main contributions of this study include the two aspects. Firstly, a noncontact electrode based on a micro-humidity fabric structure is proposed, which can improve the noncontact cECG signal quality. Secondly, based on the proposed electrode, the possibility of its application in long-term AF monitoring was investigated. The micro-humidity fabric electrode can improve the micro-humidity of the skin-electrode interface and the noncontact cECG signal quality. This humidity is low and can hardly be felt by the human body, which can also ensure comfort. The experimental results show that compared with the conventional noncontact fabric electrode, the skin-electrode impedance decreases from 104.1±58.1 MΩ (when using the electrode without the micro-humidity structure) at 0.5 Hz to 2.8±1.79 MΩ (with the micro-humidity structure). In the long-term cECG recording experiment, the system has high consistency with the reference equipment. The RR interval correlation coefficient is 0.998, and the maximum error ≤ 18 ms. For the validation of AF monitoring, a designed AF analysis algorithm is integrated into the noncontact cECG system, including effective signal screening and AF recognition algorithm based on RR interval and SVM, with an average accuracy of 98.57% on the wearable database. The algorithm is verified on 3 healthy people and 1 PAF patient using the noncontact cECG system with an average accuracy of 98.12%, showing that our system has the potential for long-term AF monitoring.
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Xiao et al. (2023) studied Atrial fibrillation (n=4). Noncontact capacitive ECG system with micro-humidity fabric electrode vs. Conventional noncontact fabric electrode was evaluated on Skin-electrode impedance at 0.5 Hz (MΩ). A noncontact capacitive ECG system with a micro-humidity fabric electrode reduced skin-electrode impedance to 2.8 MΩ and achieved 98.12% accuracy for AF recognition.
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