The underlying cause of polyhydramnios determines prematurity

Area of Science:

• Obstetrics and Gynecology
• Perinatology
• Maternal-Fetal Medicine

Background:

• Polyhydramnios, characterized by excessive amniotic fluid, is associated with an increased rate of preterm delivery compared to the general obstetric population.
• Understanding the etiological factors contributing to polyhydramnios is crucial for predicting pregnancy outcomes, particularly the timing of delivery.

Purpose of the Study:

• To investigate whether different causes of polyhydramnios are associated with varying frequencies of preterm delivery.
• To compare the incidence of preterm birth across distinct etiological subgroups of polyhydramnios.

Main Methods:

• A cohort of 340 women with singleton pregnancies diagnosed with polyhydramnios was retrospectively analyzed.
• Preterm delivery was defined as birth before 37 completed weeks of gestation.
• Etiologies for polyhydramnios included unexplained (idiopathic), insulin-dependent diabetes mellitus (IDDM), congenital malformations, and gestational diabetes mellitus.

Main Results:

• Preterm delivery occurred in 14.1% of unexplained polyhydramnios cases, 27.7% in IDDM cases, and 36% in cases with congenital malformations.
• The prevalence of preterm delivery was significantly higher in pregnancies with IDDM (P = 0.02) and congenital malformations (P = 0.001) compared to unexplained polyhydramnios.
• No significant increase in preterm delivery was observed for polyhydramnios associated with gestational diabetes mellitus compared to the general population.

Conclusions:

• The underlying etiology of polyhydramnios is a significant determinant of preterm delivery risk.
• Congenital malformations and insulin-dependent diabetes mellitus represent high-risk subgroups for preterm birth in the context of polyhydramnios.
• Gestational diabetes mellitus, as an etiology for polyhydramnios, does not appear to confer an elevated risk of preterm delivery.