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Updated: Dec 22, 2025

Bidirectional Electrical and Optoelectronic Interfaces in Healthy and Ischemic Ex Vivo Rat Hearts
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Noise-Resistant CECG Using Novel Capacitive Electrodes.

Chi-Chun Chen1, Cheng-Wei Chen1, Chang-Wei Hsieh2

  • 1Department of Electronic Engineering, National Chin-Yi University of Technology, Taichung 41170, Taiwan.

Sensors (Basel, Switzerland)
|May 7, 2020
PubMed
Summary
This summary is machine-generated.

A new capacitive electrode significantly reduces interference in capacitive electrocardiogram (CECG) signals. This novel design achieves high signal-to-noise ratio (SNR) and excellent RRI correlation for accurate heart rate monitoring.

Keywords:
ambient interferencecapacitive electrocardiogramcapacitive electrodecapacitive right leg

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Area of Science:

  • Biomedical Engineering
  • Medical Instrumentation
  • Signal Processing

Background:

  • Capacitive electrocardiogram (CECG) systems are prone to ambient interference, limiting their diagnostic accuracy.
  • Existing CECG electrodes struggle with common mode noise, particularly from AC power lines.

Purpose of the Study:

  • To develop a novel capacitive electrode for capacitive electrocardiogram (CECG) that effectively reduces ambient interference.
  • To improve the signal-to-noise ratio (SNR) and accuracy of heart rate monitoring using CECG.

Main Methods:

  • A new capacitive electrode was designed and implemented in series with a 1 pF capacitor.
  • A capacitive right leg (CRL) circuit was utilized to cancel 60 Hz common mode noise.
  • Performance was evaluated against two existing electrode designs.

Main Results:

  • The proposed capacitive electrode demonstrated superior performance compared to two counterparts.
  • Signal-to-noise ratio (SNR) was significantly improved.
  • Correlation between RRIs from ECG and CECG reached up to 99.8%, substantially higher than 52% and 63% from other electrodes.

Conclusions:

  • The novel capacitive electrode effectively minimizes interference in CECG signals.
  • This technology shows promise for accurate, long-term, noncontact heart rate monitoring.
  • Potential for integration into portable medical devices for broader healthcare applications.