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Vasa praevia is a condition in which fetal blood vessels cross or ... It is thought that vasa previa arises from an early placenta previa. As the pregnancy progresses ...
Vasa praevia is a rare condition that can result in bleeding from the fetoplacental circulation. Vasa praevia happens most often when the umbilical cord grows in a way that it directly enters the membrane, and therefore blood vessels that are unprotected by the umbilical cord or placental tissue can rupture and lead to bleeding. [16]
Vasa praevia is a very rare, presenting only 4:10,000 cases from the largest study of the condition. [16] Risks of antepartum bleeding due to vasa praevia greatly increase during the third trimester of pregnancy during cervical dilation or placenta praevia .
Besides placenta previa and placental abruption, uterine rupture can occur, which is a very serious condition leading to internal or external bleeding. Bleeding from the fetus is rare, but may occur with two conditions called vasa previa and velamentous umbilical cord insertion where the fetal blood vessels lie near the placental insertion site unprotected by Wharton's jelly of the cord. [11]
If the woman is diagnosed with velamentous cord insertion, the pregnancy is closely monitored, especially as velamentous cord insertion is a strong risk factor for vasa previa, where the exposed vessels cross the cervix and are at high risk of rupture during membrane rupture in early labor. [9]
It is used to differentiate whether the blood coming out of vagina is of the mother or fetus during delivery i.e, placenta previa versus vasa previa. It is based on the principle that fetal HbF is resistant to acids and alkali whereas the mother's blood which has HbA is sensitive to acid and alkaline.
It takes place in normal pregnancies as well as when there are obstetric or trauma related complications to pregnancy. Normally the maternal circulation and the fetal circulation are kept from direct contact with each other, with gas and nutrient exchange taking place across a membrane in the placenta made of two layers, the syncytiotrophoblast ...
In those less than 36 weeks pregnant, corticosteroids may be given to speed development of the baby's lungs. [1] Cases that occur in early pregnancy may resolve on their own. [1] Placenta praevia affects approximately 0.5% of pregnancies. [5] After four cesarean sections, however, it affects 10% of pregnancies. [4]