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Vasa praevia (vasa previa AE) is an obstetric complication defined as "fetal vessels crossing or running in close proximity to the inner cervical os. These vessels course within the membranes (unsupported by the umbilical cord or placental tissue) and are at risk of rupture when the supporting membranes rupture."
Additional recommended knowledge
These vessels may be torn at the time of labor, delivery or when the membranes rupture. It has a high fetal mortality because of the bleeding that follows. 
The classic triad are membrane rupture followed immediately by vaginal bleeding and fetal bradycardia.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Vasa_praevia". A list of authors is available in Wikipedia.|