Comparison of Labor Curves Between Spontaneous and Induced Labor

Area of Science:

• Obstetrics and Gynecology
• Perinatal Research
• Labor and Delivery

Background:

• The labor curve is a critical tool for monitoring labor progression.
• Understanding differences between induced and spontaneous labor is essential for clinical practice.

Purpose of the Study:

• To compare the labor curve, specifically the active phase duration, between induced and spontaneous labor.
• To evaluate if current criteria for active phase arrest need adjustment for induced labor.

Main Methods:

• Secondary analysis of the Consortium on Safe Labor database.
• Inclusion of nulliparous and multiparous individuals with singleton vertex pregnancies delivering vaginally.
• Modeling cervical dilation using repeated-measures analysis and comparing traverse time between labor groups.

Main Results:

• The active phase of labor began at 6 cm dilation for both induced and spontaneous labor, irrespective of parity.
• Induced labor demonstrated a significantly shorter traverse time from 6 to 10 cm dilation compared to spontaneous labor in both nulliparous and multiparous individuals.
• Traverse time was shorter in induced labor (nulliparous: 1.8 vs. 2.3 hours; multiparous: 0.9 vs. 1.4 hours).

Conclusions:

• Induced labor has a shorter active phase duration than spontaneous labor.
• The findings support the current criteria for active phase arrest as defined by the American College of Obstetricians and Gynecologists.
• No need to lengthen active phase arrest criteria for induced labor based on this analysis.