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Updated: Mar 12, 2026
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Author Spotlight: Advancing Labor Management Through Electromyometrial Imaging for Understanding Uterine Contractions
Published on: May 26, 2023
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Uterine electrical activity at labor: is there a correlation between labor stages?
Liran Hiersch1,2, Liat Salzer1,2, Amir Aviram2,3
1a Helen Schneider Hospital for Women, Rabin Medical Center , Petach Tikva , Israel.
Summary
Myometrial electrical activity, measured by electrical uterine myography (EUM), shows a positive correlation between the active and second stages of labor. EUM index correlated with active phase duration but not second stage duration.
Area of Science:
- Obstetrics and Gynecology
- Reproductive Physiology
- Medical Instrumentation
Background:
- Understanding myometrial electrical activity is crucial for monitoring labor progression.
- Electrical uterine myography (EUM) offers a noninvasive method to assess uterine contractility.
- Previous research has explored various methods to quantify uterine electrical activity during labor.
Purpose of the Study:
- To determine the association between myometrial electrical activity during the active and second stages of labor.
- To investigate the relationship between electrical uterine myography index (EUMi) and labor stage durations.
- To utilize noninvasive 9-channel surface electrodes for EUM assessment in term deliveries.
Main Methods:
- A prospective observational study included 47 women undergoing labor at term.
- Electrical uterine myography (EUM) with 9-channel surface electrodes was used for assessment.
- The EUM index (EUMi) was calculated as mean electrical activity (microjouls) over 30-minute periods for comparison between labor stages.
Main Results:
- Mean EUMi was similar between the active (3.53 ± 0.43 MJ) and second stages (3.66 ± 0.48 MJ) of labor (p=0.02).
- A strong correlation was found between mean EUMi of the active and second stages (r²=0.68, p<0.01).
- EUMi of the active stage strongly correlated with the duration of the second stage (r²=0.73, p<0.001), but EUMi did not correlate with second stage duration.
Conclusions:
- Myometrial electrical activity demonstrates a positive correlation between the active and second stages of labor.
- EUMi is associated with the duration of the active phase of labor.
- No significant correlation was observed between EUMi and the duration of the second stage of labor.
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