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Vasa previa is a rare condition in which fetal intramembranous blood vessels traverse the fetal membranes across the lower segment of the uterus between the fetus and the cervical opening. 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. Transvaginal color flow Doppler ultrasound is often used for diagnosis. Treatment with an emergency cesarean delivery is indicated.
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- Oyelese Y, Smulian J (2006). "Placenta previa, placenta accreta, and vasa previa.". Obstet Gynecol 107 (4): 927-41. PMID 16582134.
- Lijoi A, Brady J. "Vasa previa diagnosis and management.". J Am Board Fam Pract 16 (6): 543-8. PMID 14963081. Full text
- Bhide A, Thilaganathan B (2004). "Recent advances in the management of placenta previa.". Curr Opin Obstet Gynecol 16 (6): 447-51. PMID 15534438.
- Oyelese K, Turner M, Lees C, Campbell S (1999). "Vasa previa: an avoidable obstetric tragedy.". Obstet Gynecol Surv 54 (2): 138-45. PMID 9950006.
- Lee W, Lee V, Kirk J, Sloan C, Smith R, Comstock C (2000). "Vasa previa: prenatal diagnosis, natural evolution, and clinical outcome.". Obstet Gynecol 95 (4): 572-6. PMID 10725492.
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