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Related Experiment Videos

Active phase labor arrest: revisiting the 2-hour minimum.

D J Rouse1, J Owen, K G Savage

  • 1Center for Research in Women's Health, Department of Obstetrics and Gynecology, University of Alabama at Birmingham, Birmingham, Alabama 35249-7333, USA. drouse@uab.edu

Obstetrics and Gynecology
|September 29, 2001
PubMed
Summary

Oxytocin-augmented labor progresses slower than spontaneous labor. Two hours of labor arrest with 200 Montevideo units does not justify cesarean delivery, as many women still achieve vaginal birth.

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Area of Science:

  • Obstetrics
  • Maternal-Fetal Medicine
  • Labor and Delivery

Background:

  • Oxytocin is frequently used to augment labor.
  • Defining labor arrest criteria is crucial for appropriate intervention, including cesarean delivery.
  • Previous studies suggest current criteria may be too strict.

Purpose of the Study:

  • To collect contemporary data on uterine activity and labor progress during oxytocin augmentation.
  • To evaluate if a 2-hour labor arrest with at least 200 Montevideo units warrants cesarean delivery.

Main Methods:

  • A standardized protocol was used for 501 women with abnormally progressing labor, involving oxytocin and intrauterine pressure monitoring.
  • Uterine activity was maintained at ≥200 Montevideo units for ≥4 hours before considering cesarean for arrest.

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  • Maternal and neonatal outcomes were assessed.

    • Main Results:

    • Median cervical dilation rates were 1.4 cm/hr for nulliparas and 1.8 cm/hr for parous women during augmentation.
    • 38 women had labor arrest >2 hours despite ≥200 Montevideo units; 61% achieved vaginal delivery.
    • Infection rates were 26% for these 38 women; no serious neonatal complications occurred.

    Conclusions:

    • Oxytocin-augmented labor demonstrates slower progress compared to spontaneous labor.
    • Current criteria for labor arrest (2 hours with ≥200 Montevideo units) are not sufficiently rigorous to justify cesarean delivery.
    • Further research is needed to refine labor arrest guidelines.