Bleeding of fetal origin is: (AIIMS May 2010)
a. Vasa previa is a condition in which the blood vessels of the umbilical cord are present before the fetus. These vessels are liable to rupture and if they rupture extensively the fetus may bleed to death.
b. Vasa previa is rare condition, one in every 2,500.
c. If it goes undetected, it has a high fetal mortality of 50% to 90% because of the hemorrhage that occurs when the vessels are torn when the membranes rupture, either at labour or delivery.
d. There are two types of vasa previa:
i. multi-lobed placenta
ii. velamentous insertion of the umbilical cord.
e. Velamentous cord insertion is fairly common in pregnancies (1-2:100 pregnancies), which can lead to vasa previa.