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The association between polyhydramnios and preterm delivery

A Many1, L M Hill, N Lazebnik

  • 1Department of Obstetrics and Gynecology, Magee-Womens Research Institute, Magee-Womens Hospital, Pittsburgh, Pennsylvania, USA.

Obstetrics and Gynecology
|September 1, 1995
PubMed
Summary
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The severity of polyhydramnios did not significantly impact preterm delivery rates. However, underlying causes like congenital malformations and diabetes were strongly associated with earlier births in pregnancies with excess amniotic fluid.

Area of Science:

  • Obstetrics and Gynecology
  • Perinatology
  • Maternal-Fetal Medicine

Background:

  • Polyhydramnios, characterized by excessive amniotic fluid, is a condition that can complicate pregnancies.
  • The relationship between the severity of polyhydramnios and the timing of delivery, specifically preterm delivery, requires further investigation.

Purpose of the Study:

  • To investigate the association between the severity of polyhydramnios and the incidence of preterm delivery.

Main Methods:

  • A cohort of 275 singleton pregnancies diagnosed with polyhydramnios (Amniotic Fluid Index [AFI] ≥ 25 cm) was analyzed.
  • Polyhydramnios severity was categorized as mild (AFI 25-30 cm), moderate (AFI 30.1-35 cm), and severe (AFI > 35.1 cm).
  • Preterm delivery was defined as birth before 37 weeks' gestation.

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Main Results:

  • Overall, 18.9% of women experienced preterm delivery.
  • No statistically significant difference in preterm delivery rates was observed across mild (18.5%), moderate (21.8%), and severe (14.3%) polyhydramnios groups.
  • Preterm delivery was significantly more frequent in cases with congenital malformations (39%) and diabetic mothers (22.2%) compared to unexplained polyhydramnios (12.6%).

Conclusions:

  • The underlying etiology of polyhydramnios, not its severity based on amniotic fluid volume, is a more critical determinant of preterm labor.
  • Identifying and managing associated conditions like congenital anomalies and diabetes is crucial for predicting and potentially preventing preterm delivery in polyhydramnic pregnancies.