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Fetal ECG during labour: a presentation of a microprocessor system.

H Lilja¹, S Arulkumaran, K Lindecrantz

¹Department of Obstetrics and Gynaecology, Gothenburg University, Sweden.

Journal of Biomedical Engineering

|July 1, 1988

Summary

Researchers developed a microprocessor system to analyze fetal electrocardiogram (ECG) ST waveform changes. The T/QRS ratio in normal fetuses averaged 0.148, offering a new metric for fetal surveillance.

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Area of Science:

Cardiology
Neonatal Medicine
Biomedical Engineering

Background:

Fetal electrocardiogram (ECG) analysis is crucial for monitoring fetal well-being.
Assessing fetal distress often relies on indirect measures.
Novel waveform analysis may offer more direct insights.

Purpose of the Study:

To investigate the utility of fetal ECG ST waveform changes for surveillance.
To establish a baseline T/QRS ratio in normal term fetuses.
To evaluate a microprocessor-based system for on-line T wave amplitude recording.

Main Methods:

Utilized a microprocessor-based system for on-line fetal ECG T wave amplitude recording.
Employed a scalp electrode and a maternal skin electrode for signal acquisition.

Related Experiment Videos

Quantified the ST waveform using the T/QRS ratio.

Assessed signal quality for ST waveform assessment.

Main Results:

Successfully recorded ST waveform changes in 47 term deliveries with vertex presentations.
Achieved optimal ST waveform assessment in 89% of recorded cases.
Determined the mean T/QRS ratio in normal term fetuses to be 0.148 (SD 0.048).

Conclusions:

The T/QRS ratio shows potential as a quantitative measure for fetal surveillance.
Further investigation into ST waveform analysis can enhance perinatal care.
The developed system demonstrates feasibility for on-line fetal ECG monitoring.