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Related Experiment Video

Updated: May 22, 2026

Electromyometrial Imaging of Uterine Contractions in Pregnant Women

Electromyometrial Imaging of Uterine Contractions in Pregnant Women

Published on: May 26, 2023

Normal progress of induced labor.

Lorie M Harper¹, Aaron B Caughey, Anthony O Odibo

¹Department of Obstetrics and Gynecology, Washington University, St. Louis, MO, USA. harperl@wudosis.wustl.edu

Obstetrics and Gynecology

|May 10, 2012

Summary

This summary is machine-generated.

Induced labor shows a longer latent phase compared to spontaneous labor. However, the active labor phase progresses similarly in both groups, suggesting caution in diagnosing arrest before 6 cm dilation during induction.

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Area of Science:

Obstetrics and Gynecology
Reproductive Medicine
Clinical Obstetrics

Background:

Labor induction is a common obstetric intervention.
Understanding normal labor progress is crucial for clinical decision-making.
Comparing induced versus spontaneous labor aids in refining obstetric practices.

Purpose of the Study:

To compare the duration and progress of normal labor in women who underwent labor induction versus those who experienced spontaneous labor.
To analyze labor progress stratified by parity.

Main Methods:

Retrospective cohort study of 5,388 women at 37 weeks or more gestation.
Comparison of induced, augmented, and spontaneous labor groups.
Interval censored regression used to estimate labor progression times by parity.

Main Results:

Induced labor was associated with a significantly longer total labor duration compared to spontaneous labor, particularly in nulliparous women.
The time to progress 1 cm dilation in the active labor phase (≥6 cm) was similar between induced and spontaneous labor.
The latent phase of labor (<6 cm) was significantly longer in women undergoing induction.

Conclusions:

The latent phase of labor is extended in induced labor compared to spontaneous labor.
The active phase of labor shows similar progression rates between induced and spontaneous labor.
Arrest diagnoses in the latent phase (before 6 cm) for induced labor should be approached with caution.