الفهرس 
EMBRYOLOGICAL DEVELOPMENT OF THE PLACENTAOnly 14 pages are availabe for public view
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Abstract
Placenta previa is an obstetric complication that occurs in
the second and third trimesters of pregnancy. It may cause
serious morbidity and mortality to both the fetus and the
mother. It is one of the leading causes of vaginal bleeding in the
second and third trimesters. It complicates approximately 5 of
1,000 deliveries and has a mortality rate of 0.03%.
In Egypt, the risk of placenta accreta is about 15% after
one cesarean section and 60% after previous four cesarean
section.
Numerous studies have confirmed the increased risk of
placenta previa following cesarean section. Women who had
four or more deliveries with a single cesarean section had a 1.7
fold increased risk of placenta previa whereas women with
parity greater than four and four or more prior cesarean section
had almost a nine-fold increased risk of placenta previa.
Risk factors for placenta previa include prior cesarean
delivery, pregnancy termination, intrauterine surgery, smoking,
multifetal gestation, increasing parity, and maternal age.
The diagnostic modality of choice for placenta previa is
transvaginal ultrasonography.