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Electrodes in external electrohysterography: a systematic literature review
Thierry R Jossou1,2, Aziz Et-Tahir2, Zakaria Tahori3
1Department of Biomedical Engineering, Ecole Polytechnique d'Abomey-Calavi, University of Abomey-Calavi, Abomey-Calavi, Benin.
Biophysical Reviews
|June 28, 2021
Summary
Developing an external uterine electrohysterogram (EHG) system requires understanding electrode placement for accurate labor prediction. Optimal electrode configuration involves two source electrodes, a ground, and a reference, with specific positioning for effective EHG signal acquisition.
Area of Science:
- Biomedical Engineering
- Obstetrics
- Signal Processing
Background:
- Pregnant women in low-income countries face healthcare access challenges, particularly in rural areas.
- Limited access increases risks of unexpected childbirth and home births.
- Development of external uterine electrohysterogram (EHG) systems is crucial for labor prediction.
Purpose of the Study:
- To review literature on electrodes for external EHG recording.
- To identify optimal electrode characteristics and configurations for labor prediction.
Main Methods:
- Comprehensive literature review on electrode use in external EHG.
- Analysis of electrode types, configurations, and positioning.
Main Results:
- Ag/AgCl wet electrodes are most common for EHG.
- Optimal electrode placement is below the navel on the vertical median axis.
- Electrode count and spacing vary, but specific configurations yield better signals.
Conclusions:
- Two source electrodes on the vertical median axis, with strategically placed ground and reference electrodes, provide good EHG signals.
- Minimum inter-electrode distance for effective recording is 17.5-25mm.
