explanation of placenta previa

Definition/explanation of placenta previa-

During pregnancy, the placenta moves as the uterus stretches and grows. In early pregnancy, a low-lying placenta is very common. But as the pregnancy progresses, the growing uterus should "pull" the placenta toward the top of the womb. By the third trimester, the placenta should be near the top of the uterus, leaving the opening of the cervix clear for the delivery.

Sometimes, though, the placenta remains in the lower portion of the uterus, partly or completely covering this opening. This is called a previa.

Your doctor will order pelvic rest, which means no intercourse, no tampons, and no douching. Nothing should be placed in the vagina.

Your health care providers will carefully weigh your risk of ongoing bleeding against the risk of an early delivery for your baby.

Women with placenta previa most likely need to deliver the baby by cesarean section. This helps prevent death to the mother and baby. An emergency cesarean may be done if the placenta actually covers the cervix and the bleeding is heavy or life threatening.

Risks to the mother include:

• Death
• Major bleeding (hemorrhage)
• Shock

There is also an increased risk for infection, blood clots, and necessary blood transfusions.