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Complications associated with the macrosomic fetus.

S Lazer, Y Biale, M Mazor

    The Journal of Reproductive Medicine
    |June 1, 1986
    PubMed
    Summary

    Infants weighing over 4,500 g (macrosomic infants) face higher risks of complications during delivery. Cesarean section is recommended for macrosomic fetuses, except in cases of prior macrosomic delivery.

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    Area of Science:

    • Obstetrics
    • Perinatology
    • Neonatal Studies

    Background:

    • Macrosomia, defined as infants weighing over 4,500 g, is associated with increased maternal and fetal risks.
    • Previous studies indicate potential complications, but a comprehensive comparison with a normal birth weight group is warranted.

    Purpose of the Study:

    • To compare the incidence of adverse maternal and fetal outcomes in deliveries of macrosomic infants versus normal birth weight infants.
    • To identify specific risk factors and complications associated with macrosomic deliveries.

    Main Methods:

    • A retrospective study involving 525 infants weighing over 4,500 g.
    • Comparison with a control group of infants weighing 2,500-4,000 g.
    • Analysis of maternal demographics, pregnancy complications, delivery methods, and neonatal outcomes.

    Main Results:

    • Macrosomic deliveries showed higher rates of grand multiparity, diabetes mellitus, pregnancy-induced hypertension, advanced maternal age, placenta previa, and excessive maternal weight gain.
    • Instrumental delivery and cesarean section rates were significantly higher in the macrosomic group, with cephalopelvic disproportion as the primary indication.
    • Postpartum hemorrhage, shoulder dystocia, oxytocin augmentation, and birth canal tears were more frequent in macrosomic deliveries.
    • Maternal and fetal morbidity, and perinatal mortality were significantly elevated in the macrosomic group, linked to difficult second-stage labor.

    Conclusions:

    • Macrosomic infants present a significantly higher risk profile for both mother and neonate.
    • Cesarean delivery is strongly recommended for macrosomic fetuses, with an exception for women with a history of delivering a macrosomic infant.
    • Management strategies should focus on mitigating risks associated with difficult labor progression in macrosomic pregnancies.

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