45. Placenta Previa and Related Placental Disorders

  1. John T. Queenan MD3,
  2. Catherine Y. Spong MD4 and
  3. Charles J. Lockwood MD5
  1. Yinka Oyelese MD1,2

Published Online: 4 JAN 2012

DOI: 10.1002/9781119963783.ch45

Queenan's Management of High-Risk Pregnancy: An Evidence-Based Approach, Sixth Edition

Queenan's Management of High-Risk Pregnancy: An Evidence-Based Approach, Sixth Edition

How to Cite

Oyelese, Y. (2012) Placenta Previa and Related Placental Disorders, in Queenan's Management of High-Risk Pregnancy: An Evidence-Based Approach, Sixth Edition (eds J. T. Queenan, C. Y. Spong and C. J. Lockwood), Wiley-Blackwell, Oxford, UK. doi: 10.1002/9781119963783.ch45

Editor Information

  1. 3

    Department of Obstetrics and Gynecology, Georgetown University School of Medicine, Washington, DC, USA

  2. 4

    Bethesda, MD, USA

  3. 5

    Department of Obstetrics, Gynecology and Reproductive Sciences, Yale University School of Medicine, New Haven, CT, USA

Author Information

  1. 1

    Department of Obstetrics and Gynecology, Jersey Shore University Medical Center, NJ, USA

  2. 2

    UMDNJ-Robert Wood Johnson Medical School, New Brunswick, NJ, USA

Publication History

  1. Published Online: 4 JAN 2012
  2. Published Print: 24 FEB 2012

ISBN Information

Print ISBN: 9780470655764

Online ISBN: 9781119963783

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Keywords:

  • placenta previa, and related placental disorders;
  • placenta, normal implantation in upper uterine segment;
  • abnormal implantation into lower segment, placenta previa;
  • placenta previa, into four types;
  • placental migration;
  • women with vaginal bleeding, considered for placenta previa;
  • placenta previa, and increased perinatal mortality;
  • “vasa previa” fetal vessels through membranes over cervix;
  • perinatal deaths from vasa previa, preventable;
  • Color Doppler imaging, in placenta accrete diagnosis

Summary

The placenta usually implants in the upper uterine segment. However, in some cases, it implants in the lower uterine segment, either covering the internal cervical os or lying in close proximity to it. This abnormal implantation into the lower segment, called placenta previa, is one of the most important causes of bleeding in the second half of pregnancy and during labor, and is associated with significant maternal and perinatal morbidity and occasionally mortality. Placenta previa may also be associated with two other clinically important conditions, placenta accreta and vasa previa, which are also discussed in this chapter.