Electrodes for long-term esophageal electrocardiography.
Thomas Niederhauser1, Andreas Haeberlin, Thanks Marisa
1ARTORG Cardiovascular Engineering, University of Bern, BE 3010 Bern, Switzerland. thomas.niederhauser@artorg.unibe.ch
IEEE Transactions on Bio-Medical Engineering
|May 8, 2013
Summary
New esophageal ECG electrodes made of titanium nitride and iridium oxide offer superior signal quality and durability for long-term heart monitoring compared to traditional materials.
Area of Science:
- Biomedical Engineering
- Materials Science
- Cardiovascular Technology
Background:
- Long-term, high-quality electrocardiogram (ECG) recording demands advanced electrode solutions beyond conventional surface skin electrodes.
- Esophageal ECG offers potential for improved signal fidelity but requires innovative electrode and recorder designs.
- Electrode material selection is critical, balancing biopotential recording efficacy with chemical inertness.
Purpose of the Study:
- To evaluate novel and established electrode materials for long-term esophageal ECG recording.
- To assess material performance based on electrochemical impedance spectroscopy and signal analysis.
- To establish criteria for selecting optimal electrode materials for ambulatory ECG.
Main Methods:
- Investigated PEDOT, silver-PDMS, stainless steel, platinum, gold, iridium oxide, titanium nitride, and glassy carbon.
- Utilized long-term electrochemical impedance spectroscopy (EIS) in artificial saliva.
- Performed model-based signal analysis with a dedicated ECG amplifier.
Main Results:
- Titanium nitride and iridium oxide with microstructured surfaces showed no degradation in acidic artificial saliva.
- These materials exhibited low potential drifts and minimal signal distortion, outperforming surface skin electrodes.
- Noble metals (platinum, gold, silver) caused signal distortion, while stainless steel corroded.
Conclusions:
- Microstructured titanium nitride and iridium oxide are highly suitable for prolonged esophageal ECG monitoring.
- These materials surpass noble metals and stainless steel in terms of stability and signal integrity.
- The study provides a robust framework for selecting electrode materials for advanced ECG applications.
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