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Related Experiment Videos

Transition from latent to active labor.

D B Peisner, M G Rosen

    Obstetrics and Gynecology
    |October 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

    In normal labor, most women reach the active phase by 5 cm cervical dilation. If not, it may indicate a high probability of labor dystocia.

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    Area of Science:

    • Obstetrics and Gynecology
    • Maternal-Fetal Medicine
    • Labor Physiology

    Background:

    • The transition from latent to active labor is a critical phase in childbirth.
    • Friedman's labor progression curves are widely used but may require refinement.
    • Understanding normal labor progression is key to identifying deviations and potential complications.

    Purpose of the Study:

    • To investigate the cervical dilation at which the transition from latent to active labor occurs in uncomplicated spontaneous vertex deliveries.
    • To determine if parity influences the timing of this labor phase transition.
    • To establish a more precise cervical dilation threshold for defining the active phase of labor.

    Main Methods:

    • Retrospective analysis of 1060 nulliparous and 639 multiparous women in spontaneous labor with singleton vertex presentation and intact membranes.

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  • Independent variables included parity and vaginal examination findings.
  • Dependent variable was the rate of cervical dilation, specifically the point of transition to active labor.

    • Main Results:

    • No significant differences in labor transition timing were observed between nulliparous and multiparous women.
    • Less than 50% of labors transitioned to active phase by 4 cm dilation, and 74% by 5 cm.
    • Excluding protracted/arrested labors, 60% transitioned by 4 cm and 89% by 5 cm.

    Conclusions:

    • A cervical dilation of 5 cm appears to be a reliable indicator for the active phase of labor in uncomplicated cases.
    • Failure to reach the active phase by 5 cm dilation suggests a high probability of labor dystocia.
    • These findings may help refine clinical management and diagnosis of labor abnormalities.