Placenta previa is a complication of pregnancy in which the placenta grows in the lowest part of the womb (uterus) and covers all or part of the opening to the cervix.
The placenta is the organ that nourishes the developing baby in the womb.
Causes, incidence, and risk factorsDuring 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.
There are different forms of placenta previa:
Placenta previa occurs in 1 out of 200 pregnancies. It is more common in women who have:
Women who smoke or have their children at an older age may also have an increased risk. Possible causes of placenta previa include:
The main symptom of placenta previa is sudden, painless vaginal bleeding that often occurs near the end of the second trimester or beginning of the third trimester. In some cases, there is severe bleeding, or hemorrhage. The bleeding may stop on its own but can start again days or weeks later.
There may be uterine cramping with the bleeding. Labor sometimes starts within several days after heavy vaginal bleeding. However, in some cases, bleeding may not occur until after labor starts.
See: Vaginal bleeding in pregnancy
Signs and testsYour health care provider can diagnose placenta previa with an ultrasound exam. Most cases of placenta previa are identified by routine ultrasound during pregnancy.
TreatmentTreatment depends on various factors:
Many times the placenta moves away from the cervical opening before delivery.
If the placenta is near the cervix or is covering a portion of it, you may need to reduce activities and stay on bed rest. Your doctor will order pelvic rest, which means no intercourse, no tampons, and no douching. Nothing should be placed in the vagina.
If there is bleeding, however, you will most likely be admitted to a hospital for careful monitoring.
If you have lost a lot of blood, blood transfusions may be given. You may receive medicines to prevent premature labor and help the pregnancy continue to at least 36 weeks. Beyond 36 weeks, delivery of the baby may be the best treatment.
If your blood type is Rh-negative, you will be given anti-D immunoglobulin injections.
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 c-section may be done if the placenta actually covers the cervix and the bleeding is heavy or very life threatening.
Expectations (prognosis)Placenta previa is most often diagnosed before bleeding occurs. Careful monitoring of the mother and unborn baby can prevent many of the significant dangers.
The biggest risk is that severe bleeding will require your baby to be delivered early, before major organs, such as the lungs, have developed.
Most complications can be avoided by hospitalizing a mother who is having symptoms, and delivering by C-section.
ComplicationsRisks to the mother include:
There is also an increased risk for infection, blood clots, and necessary blood transfusions.
Prematurity(infant is less than 36 weeks gestation) causes most infant deaths in cases of placenta previa. The baby may lose blood if the placenta separates from the wall of the uterus during labor. The baby also can lose blood when the uterus is opened during a C-section delivery.
Calling your health care providerCall your health care provider if you have bleeding from the vagina at any point in your pregnancy. Placenta previa can be dangerous to both you and your baby.
PreventionThis condition is not preventable.
ReferencesFrancois KE, Foley MR. Antepartum and postpartum hemorrhage. In: Gabbe SG, Niebyl JR, Simpson JL, eds. Obstetrics - Normal and Problem Pregnancies. 5th ed. Philadelphia, Pa: Elsevier Churchill Livingstone; 2007:chap 18.
Houry DE, Abbott JT. Acute complications of pregnancy. In: Marx J, ed. Rosen's Emergency Medicine: Concepts and Clinical Practice. 6th ed. St Philadelphia, Pa: Mosby Elsevier; 2006:chap 177.
Cunnigham FG, Leveno KL, Bloom SL, et al . Obstetrical hemorrhage. In: Cunnigham FG, Leveno KL, Bloom SL, et al, eds. Williams Obstetrics. 22nd ed. New York, NY; McGraw-Hill; 2005:chap 35.
Placenta Previa
Previa in medical terms is often used as shorthand for placenta previa. Placenta previa is a condition in which the placenta is situated low in the uterus. Because of this malposition, at delivery the woman can experience a great loss of blood.
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Placenta Previa
my wife has placenta previa. Depending upon how severe it is you will most likely have a section
Placenta previa is a term used to describe a situation involving the placenta being attached to the wall of the uterus close to the cervix. Sometimes, placenta previa can have no symptoms, but some of the most commonly experienced symptoms are cramps and bleeding during pregnancy.
Placenta previa can be detected during an ultra sound, but it is normal to have low-lying placenta early in pregnancy.
This condition is called Placenta Previa. With placenta previa, the placenta grows on the lower part of the uterus partially or totally covering the opening of the cervix. The placenta should form at the top of the uterus, above the baby. With a normal pregnancy, the baby would be born first, then the placenta. With placenta previa, the placenta would be delivered first. Women with placenta previa require a c-section because as soon as the umbilical cord comes into contact with oxygen, the baby will automatically breathe with his lungs. Delivering the placenta first puts the baby at risk of suffocation in the womb.
Placenta previa, placenta accreta, placenta increta, and placenta increta are all conditions stemming from abnormal implantation of the placenta.
Yes. But the movement is relative. Placenta does not change the position. But lower placenta may move up. So that placenta previa may become normal placenta.
Placenta abruptio or placental abruption is abnormal separation of the placenta from the uterine wall.
The pathology can appear as soon as in the 20th week of pregnancy but is usually seen around the 29th week. it shows as a bleeding without contractions. It can be followed for more bleedings, each growing in volume.