Why the study?
Does specific electrode placement improve fetal ECG signal-to-noise ratio in pregnant women?
Does specific electrode placement improve fetal ECG signal-to-noise ratio in pregnant women?
Optimizing electrode placement on the maternal abdomen significantly improves the signal-to-noise ratio of fetal ECG recordings.
Electrode location was associated with fetal ECG SNR; hypothesis-generating and should not yet change practice.
The electrocardiogram (ECG) recorded from the abdominal surface of a pregnant woman is a composite of maternal ECG, fetal ECG (fECG) and other noises, while only the fECG component is always needed by us. With different locations of electrode pairs on the maternal abdominal surface to measure fECGs, the signal-to-noise ratios (SNRs) of the recorded abdominal ECGs are also correspondingly different. Some regularity on how to locate electrodes to obtain higher fECG SNRs is needed practically. In this paper, 343 groups of abdominal ECG records were acquired from 78 pregnant women with different electrode pairs locating, and an appropriate extended research database is formed. Then the regularity on fECG SNRs corresponding to different electrode pairs locating was studied. Based on statistical analysis, it is shown that the fECG SNRs are significantly higher in certain locations than others. Reasonable explanation is also provided to the statistical result using the theories of the fetal cardiac electrical axis and the signal phase delay.
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Zhang et al. (2015) studied this question.
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