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Risk factors for shoulder dystocia.

D B Acker, B P Sachs, E A Friedman

    Obstetrics and Gynecology
    |December 1, 1985
    PubMed
    Summary

    Shoulder dystocia risk increases with infant birth weight, particularly in diabetic pregnancies and those with large fetuses. Cesarean delivery is advised for high-risk diabetic pregnancies and potentially for non-diabetic pregnancies with large fetuses and abnormal labor.

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    Area of Science:

    • Obstetrics and Gynecology
    • Perinatal Medicine
    • Maternal-Fetal Medicine

    Background:

    • Shoulder dystocia is a significant obstetric complication.
    • Identifying risk factors is crucial for preventing adverse neonatal outcomes.

    Purpose of the Study:

    • To examine risk factors for shoulder dystocia in a general obstetrical population delivering vaginally.
    • To assess the impact of infant birth weight, gestational age, and maternal diabetes on shoulder dystocia incidence.

    Main Methods:

    • Retrospective analysis of vaginal deliveries.
    • Stratification of data by infant birth weight, gestational age, and maternal diabetic status.
    • Evaluation of labor abnormalities as predictors.

    Main Results:

    • Shoulder dystocia incidence increases with infant birth weight, especially in diabetic gravidas.
    • For non-diabetic women, 10.0% and 22.6% incidence occurred with infants 4000-4499g and 4500+g respectively.
    • In the 4500+g group, labor arrest disorder predicted shoulder dystocia in 55.0% of cases.
    • Diabetes and large fetal weight (4000+g) predicted 73% of shoulder dystocia in diabetics.
    • Large fetal weight alone predicted 52% of shoulder dystocia in non-diabetics.

    Conclusions:

    • Cesarean section is recommended for diabetic gravidas with estimated fetal weight of 4000+g.
    • Consideration of cesarean section for non-diabetic gravidas with estimated fetal weight of 4500+g and abnormal labor is advised.
    • Infant birth weight and maternal diabetes are key predictors of shoulder dystocia.

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