Risk factors for preterm delivery with placenta previa

Shira G. Fishman 1 , Stephen T. Chasen 1  and Bani Maheshwari 1
  • 1 Division of Maternal Fetal Medicine, Department of Obstetrics and Gynecology, Weill Medical College of Cornell University, New York, NY, USA

Abstract

Aims: To identify factors associated with preterm delivery in cases of sonographically identified placenta previa.

Methods: Pregnancies with sonographic evidence of placenta previa at ≥28 weeks were identified. Demographic information, antepartum course, and delivery information were extracted from electronic medical records. Statistical analysis was performed with Fisher’s exact test, Mann-Whitney U, Spearman’s ρ (correlation), and logistic regression. Continuous data are presented as median (interquartile range).

Results: Of 113 singleton pregnancies with placenta previa, 54 (48%) delivered at term and 59 (52%) delivered preterm. Fifty-one (45%) experienced antepartum bleeding at a median gestational age of 31 weeks (29–33 weeks) with a median interval of 20 days (11–33 days) between first bleeding episode and delivery. Women with antepartum bleeding were more likely to be delivered for hemorrhage (36 of 51 vs. 8 of 62, P<0.001) and delivered emergently (40 of 51 vs. 14 of 62, P<0.001). Antepartum bleeding before 34 weeks had a positive predictive value of 88% for preterm birth and 83% for emergent delivery.

Conclusion: In pregnancies with placenta previa, antepartum bleeding is a strong predictor of preterm delivery.

Purchase article
Get instant unlimited access to the article.
$42.00
Log in
Already have access? Please log in.


or
Log in with your institution

Journal + Issues

The Journal of Perinatal Medicine is a truly international forum covering the entire field of perinatal medicine. It is an essential news source for all those obstetricians, neonatologists, perinatologists and allied health professionals who wish to keep abreast of progress in perinatal and related research.

Search