title: Abnormal Placentation: Placenta Previa, Vasa Previa, and Placenta Accreta.
abstract: Placental disorders such as placenta previa, placenta accreta, and vasa previa are all associated with vaginal bleeding in the second half of pregnancy. They are also important causes of serious fetal and maternal morbidity and even mortality. Moreover, the rates of previa and accreta are increasing, probably as a result of increasing rates of cesarean delivery, maternal age, and assisted reproductive technology. The routine use of obstetric ultrasonography as well as improving ultrasonographic technology allows for the antenatal diagnosis of these conditions. In turn, antenatal diagnosis facilitates optimal obstetric management. This review emphasizes an evidence-based approach to the clinical management of pregnancies with these conditions as well as highlights important knowledge gaps.
authors.affiliation: University of Utah School of Medicine, Salt Lake City, Utah.
authors.forename: Robert M
authors.initials: RM
authors.lastname: Silver
mesh_terms: D000328:Adult; D002585:Cesarean Section / Q000379:methods; D019317:Evidence-Based Medicine; D005260:Female; D006801:Humans; D007044:Hysterectomy / Q000379:methods; D007231:Infant, Newborn; D010921:Placenta Accreta / Q000000981:diagnostic imaging* / Q000601:surgery; D010923:Placenta Previa / Q000000981:diagnostic imaging* / Q000601:surgery; D011247:Pregnancy; D011248:Pregnancy Complications / Q000000981:diagnostic imaging / Q000601:surgery; D011256:Pregnancy Outcome; D011262:Pregnancy Trimester, Second; D018570:Risk Assessment; D012720:Severity of Illness Index; D016896:Treatment Outcome; D016216:Ultrasonography, Prenatal / Q000379:methods*; D014592:Uterine Hemorrhage / Q000175:diagnosis / Q000209:etiology; D055949:Vasa Previa / Q000000981:diagnostic imaging* / Q000601:surgery