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Doctor insights on: Placenta Previa Pathophysiology

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What is a placenta previa?

What is a placenta previa?

Blocks birth canal.: Placenta previa occurs when it implants over the maternal cervix of the uterus, thereby blocking the birth canal and precluding safe vaginal delivery. This is a potentially life-threatening condition that is best managed by experienced obstetrician/maternal-fetal medicine specialist at a large tertiary hospital with blood bank and ICU availability. ...Read more

Dr. James Krick
144 Doctors shared insights

Placenta Blocks Cervix (Definition)

A previa is when a placenta entirely covers the opening of the cervix into the uterus (internal os). It is a reason for a cesarean section and if bleeding occurs and stops it may be a ...Read more


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Is placenta previa hereditary?

Is placenta previa hereditary?

No: Placenta previa is an obstetric complication in which the placenta is inserted partially or wholly in lower uterine segment. It can sometimes occur in the later part of the first trimester, but usually during the second or third. It is a leading cause of antepartum haemorrhage (vaginal bleeding). It affects approximately 0.4-0.5% of all labours. ...Read more

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What are the tests for placenta previa?

What are the tests for placenta previa?

Ultrasound: Ultrasound is the main way to follow a previa. If your previa resolves with time, your labor should be the same as anyone else's. If it doesn't, tests for anemia, clotting factors, and blood availabilty are tests that are performed to be prepared for any emergency at delivery. Most patients are at bed rest in their 2nd trimester and pelvic rest until delivery. ...Read more

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What is placenta previa marginalis grade 2?

What is placenta previa marginalis grade 2?

Placenta previa: Normally, the position of the placenta is near the top of the womb. In some cases however, the placenta stays in the lower portion (part) of the womb, and either partially or completely covers the cervix (neck of the womb). The described grading is when the placenta reaches the cervix, but doesn't cover it. ...Read more

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Why is there bleeding with placenta previa?

Why is there bleeding with placenta previa?

Leaky vessels: Previa: Placenta overlies the cervix/birth canal. Gr 1 means placenta is close, Gr 4 means it's directly overlying/blocking the baby's exit -- high chance of preterm labor & bleeding; you'd need a C/S at 36-37wks. More common in woman w/ hx of C/S & smoking. Not much you can do but wait. If dx'ed early, the uterus still grows/stretches and a placenta can migrate away even in 3rd tri. Follow w/ US. ...Read more

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I have placenta previa but can I still do anal?

I have placenta previa but can I still do anal?

No: When you have placenta previa you should avoid all intercourse as it can still impact the uterus. ...Read more

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How to treat placenta previa marginalis grade 1?

How to treat placenta previa marginalis grade 1?

No treatment: Have to see if it resolves, if it does not then u will need a csection cannot deliver vaginally if u have that please discuss with your ob. ...Read more

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Could placenta previa lead to placenta percreta?

PP can be percreta: A placenta prévia can invade the uterine and cervical tissues and be associated with a placenta increta and placenta percreta. ...Read more

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How long does bleeding with placenta previa last?

How long does bleeding with placenta previa last?

Varies: Placenta previa is a condition in which the placenta implants directly over the cervix and blocks the birth canal. For this reason, women with placenta previa require a c-section. Since the placenta is exposed more, it is more prone to bleeding as well. Bleeding ranges from continuous or occasional spotting to torrential hemorrhage that could threaten the lives of both mother and baby. ...Read more

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Why is the bleeding painless from placenta previa?

Why is the bleeding painless from placenta previa?

No contractions.: Because the bleeding does not involve the contractile part of the uterus, only the placenta over the cervix. The placenta is devoid of innervation, therefore the mother does not experience pain in bleeding previa unless preterm labor is also present. ...Read more

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Does smoking increase the risk for placenta previa?

Does smoking increase the risk for placenta previa?

Yes: Previa: Placenta overlies the cervix/birth canal. Gr 1 means placenta is close, Gr 4 means it's directly overlying/blocking the baby's exit -- high chance of preterm labor & bleeding; you'd need a C/S at 36-37wks. More common in woman w/ hx of C/S & smoking. Not much you can do but wait. If dx'ed early, the uterus still grows/stretches and a placenta can migrate away even in 3rd tri. Follow w/ US. ...Read more

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If I have placenta previa, when am I most likely to bleed?

If I have placenta previa, when am I most likely to bleed?

Third trimester.: Most cases of placenta previa wither resolve or start bleeding by the third trimester (>28 weeks). Avoid all ssris, aspirin-like drugs (nsaids, motrin, aleve, advil) and only take regular tylenol (acetaminophen) during pregnancy. Avoid intercourse and heavy lifting/exercise until delivery or resolution of your placenta previa. Serial ultrasounds with an experienced maternal-fetal medicine specialist are warranted! ...Read more

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What congenital anomolies are associated with placenta previa?

What congenital anomolies are associated with placenta previa?

Nothing specific: In 3 deades of pediatrics and much of that dealing with birth defects, I know of no anomaly that is linked to placenta previa. The selection of an implantation site for the embryo and development of the placenta in a previa location appears to be random. ...Read more

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Can you deliver vaginally if placenta previa corrects itself? C

Can you deliver vaginally if placenta previa corrects itself? C

Yes it is possible: If it corrects itself completely you should be able to deliver vaginally. Check with your ob. ...Read more

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What is it like to have placenta previa and placenta venous lakes?

Placenta: Venous lakes in the placenta can be very normal but previa is a low lying placenta that can dangerously bleed and be a reason for emergent delivery. ...Read more

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Is it abruptio or placenta previa that bleeds when placenta is low?

Is it abruptio or placenta previa that bleeds when placenta is low?

May be both: A previa is usually painless bleeding when the cervix is changing (dilating) causing bleeding from torn vessels being sheared off. It is a type of abruption although any bleeding from a detaching placenta is strictly called an abruption. These are usually away from the cervix and can be associated with cramping, pain, or heavy bleeding. If you have a previa, let your doc know if you bleed. ...Read more

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Is there a chance of bleeding even after correction of placenta previa?

Is there a chance of bleeding even after correction of placenta previa?

Yes: There is no surgical or mefical treatment yo correct placenta previa however sometimes the placenta can change or move so that it no longer overlies the opening of the cervix if you have true placenta previa it needs to be closely monitored especially the closer you get to going in labor as at that time your cervix will dilate and can cause severe bleeding. ...Read more

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If abroad with a placenta previa, better to fly to us or stay in shanghai?

Depends: This depends on how far along you are in the pregnancy and the degree of placenta previa. Your OB would answer this better based on your history and exam. ...Read more

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Placenta (Definition)

The placenta is an organ that connects the developing fetus to the uterine wall to allow nutrient uptake, waste elimination, and gas exchange via ...Read more