Fetal blood loss in abnormal cord inseion is seen in :

Vasa Pre is usually associated with velamentous inseion when some of the fetal vessels in the membranes cross the region of cervical os and are below the presenting pa. Sometimes this can also occur with the succenturiate lobed placenta or with the marginal inseion of cord. This may be the cause for antepaum hemorrhage when with rupture of membranes, tearing of a fetal vessel may lead to fatal bleeding, fetal distress, and fetal death if not delivered immediately. Reference: Mudaliar and Menon's clinical obstetrics,12th edition, page no:30