Second-trimester placental location and postpartum hemorrhage

Area of Science:

• Obstetrics and Gynecology
• Maternal-Fetal Medicine
• Diagnostic Ultrasound

Background:

• Postpartum hemorrhage (PPH) is a leading cause of maternal mortality worldwide.
• Early identification of risk factors for PPH is crucial for timely intervention.
• Placental location in the second trimester may predict later complications.

Purpose of the Study:

• To determine if second-trimester low placentation is an independent risk factor for postpartum hemorrhage.
• To assess the association between various degrees of low placentation and PPH.
• To evaluate if PPH risk persists after resolution of low placentation.

Main Methods:

• Retrospective cohort study involving women undergoing transvaginal sonography.
• Gestation period: 18 weeks to 23 weeks 6 days.
• Classification of placentation: low-lying (0.1-2.5 cm), marginal previa, complete previa, and normal placentation (controls).

Main Results:

• 410 women with second-trimester low placentation were identified.
• Increased rates of postpartum hemorrhage and uterotonic use were observed in women with low placentation compared to controls.
• Elevated PPH risk persisted even in cases where low placentation resolved (OR 2.72, OR 2.18).

Conclusions:

• A second-trimester diagnosis of low placentation is associated with an increased risk of postpartum hemorrhage.
• Low placentation, regardless of resolution, represents a significant risk factor for PPH.
• Routine sonographic evaluation for placental position in the second trimester may aid in identifying at-risk pregnancies.