Journal
OBSTETRICS AND GYNECOLOGY CLINICS OF NORTH AMERICA
Volume 47, Issue 1, Pages 117-+Publisher
W B SAUNDERS CO-ELSEVIER INC
DOI: 10.1016/j.ogc.2019.10.002
Keywords
Placenta; Previa; Accreta; Circumvallate; Velamentous insertion; Cesarean section; In vitro fertilization
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Primary disorders of placental implantation have immediate consequences for the outcome of a pregnancy. These disorders have been known to clinical science for more than a century, but have been relatively rare. Recent epidemiologic obstetric data have indicated that the rise in their incidence over the last 2 decades has been iatrogenic in origin. In particular, the rising numbers of pregnancies resulting from in vitro fertilization (IVF) and the increased use of caesarean section for delivery have been associated with higher frequencies of previa implantation, accreta placentation, abnormal placental shapes, and velamentous cord insertion. These disorders often occur together.
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