Electrohysterography for Uterine Contractility Monitoring: Measurement Principles, Clinical Evidence, and Reporting...

Area of Science:

• Obstetrics and Gynecology
• Biomedical Engineering
• Physiological Measurement

Background:

• Current methods like tocodynamometry and cardiotocography (CTG) inadequately assess uterine contractility, especially in cases of maternal obesity.
• These methods measure mechanical effects, missing significant contractions confirmed by intrauterine pressure catheters.
• Surface electrohysterography (EHG) records myometrial electrical activity, offering a more accurate detection rate (~94%) of contractions.

Purpose of the Study:

• To review electrohysterography (EHG) and uterine electromyography (EMG) as uterine contractility monitoring modalities.
• To compare electrical methods with traditional cardiotocography (CTG) against the intrauterine pressure catheter standard.
• To identify barriers and propose priorities for the clinical translation of EHG.

Main Methods:

• Review of physiological origins, hardware, signal characteristics, feature extraction, and machine learning analysis of EHG and uterine EMG.
• Comparative analysis of EHG and CTG against intrauterine pressure catheter measurements.
• Assessment of methodological heterogeneity and its impact on EHG translation.

Main Results:

• EHG and uterine EMG provide superior detection of uterine contractions compared to CTG.
• Electrical methods offer unique predictive parameters like spectral peak frequency and propagation velocity.
• Methodological heterogeneity in EHG studies (electrodes, filtering, feature definitions) is the primary barrier to clinical adoption.

Conclusions:

• Standardization of EHG methodology is essential for cross-study comparability and meta-analysis.
• Priorities for translation include external validation, shared datasets, explainable models, and outcome-linked trials.
• EHG holds significant promise for improving labor assessment, preterm labor diagnosis, and obstetric intervention timing.