Placenta previa - Learning Issue Placenta previa-MH Dont...

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Learning Issue: Placenta previa - MH · Don’t Miss This: Key points are highlighted · Definition: Occurs when the placenta is implanted in the lower uterine segment within the zone of effacement and dilatation of the cervix obstructing the decent of a presenting part. · Etiology: Such factors include scarred or poorly vascularized endometrium in the corpus, a large placenta, and abnormal forms of placentation such as succenturiate (def..accessory, serving as a substitute). Multiple gestation has a slightly high increase. The risk of placenta previa is tripled with the presence of a cesarean scar. · Risk Factors or Predisposing Factors: Advanced aging, multiparity, and previous cesarean delivery · Epidemiology: Happens in approximately 1 of 200 births, but only 20% are complete, and approximately 90% will be parous. Grand multiparas may have an incidence as high as 1 in 20 births. · Pathophysiology: Bleeding in placenta previa may be a result of any of the following causes: (1) mechanical separation of the placenta from its implantation site, either during the
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