What is placenta previa?
Placenta previa is a condition where a
low-lying pla-centa covers the internal cervical os; it occurs in about 1/200
deliveries. Predisposing factors include multiparity, advanced maternal age,
and prior cesarean section.
The previa may be marginal, partial, or
complete. With a complete placenta previa, the placenta covers the entire
cervical os, thereby preventing vaginal delivery of the fetus. Incomplete
coverage of the cervical os is referred to as a par-tial placenta previa. A
marginal previa is a partial placenta previa associated with a low-lying
placenta and minimal placental coverage of the cervix. In a low-lying placenta,
the placenta is implanted in the lower uterine segment but does not cover the
internal cervical os.
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