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Abstract
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.
Highlights
Electrocardiograms (ECG) were developed as a reliable tool to diagnose heart arrhythmia [1,2].they have been widely employed for monitoring purposes, e.g., in sports training monitoring, fatigue monitoring, mental stress monitoring, and more [3,4,5,6]
A noise-resistant capacitive ECG (CECG) measurement apparatus is designed using a pair of novel capacitive electrodes and a noise filtering technique
The 1–2 V floating body potential mainly arises from extremely low frequency (ELF) fields which are ubiquitous in our environment, but remain hardly understood
Summary
Electrocardiograms (ECG) were developed as a reliable tool to diagnose heart arrhythmia [1,2]. They have been widely employed for monitoring purposes, e.g., in sports training monitoring, fatigue monitoring, mental stress monitoring, and more [3,4,5,6]. A standard lead I ECG requires Ag-AgCl electrode prep pads attached to the skin of a subject via a layer of wet conductive gel. Use of conductive gel is definitely a major disadvantage for long-term ECG monitoring. A major advantage of CEGG over ECG is that the wet conductive gel required in ECG dries as time elapses, resulting in unwanted noise due to poor contact between electrodes and the skin of a subject. CECG can be well applied to long-term ECG monitoring of bedridden patients
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