Placenta praevia is said to occur when a placenta is situated in the lower uterine segment. There are degrees of abnormality associated with increasing need for a caesarian section instead of SVD; these are:
The degree of placenta praevia is also dependent on the extent of cervical dilatation at the time of examination.
It occurs in about 0.5% of pregnancies, and it is associated with maternal antepartum haemorrhage.
Uterine contractions result in the shearing off of the placenta from the myometrium and the decidua. As a result, the closer to term, the larger the amount of bleeding.
NICE suggest that (1):
Last reviewed 01/2018