Overview
Introduction
Placenta previa results from implantation of the blastocyst in the lower uterine segment, causing the placenta to partially or completely cover the internal cervical os.
NCLEX-RN
NCLEX-RN
Placenta previa results from implantation of the blastocyst in the lower uterine segment, causing the placenta to partially or completely cover the internal cervical os. As the lower uterine segment thins and the cervix begins to efface in the third trimester, the anchoring placental villi are disrupted from the decidua basalis, exposing maternal spiral arteries and causing hemorrhage. The severity of bleeding depends on the degree of placental separation and the vascularity of the implantation site. Complete previa carries the highest risk of life-threatening hemorrhage. The nurse must perform comprehensive hemorrhage assessment, manage fluid resuscitation, coordinate blood product availability, maintain continuous fetal surveillance, and prepare for emergency cesarean delivery.
Unlock full lesson + practice questions
9 more sections with scenarios, priorities, and review drills.
Final rapid review before practice
Next study step
Finish the lesson first, then choose a focused activity to apply what you just reviewed.
Continue studying
Sign in to save progress on this lesson.
Unlock the interactive lesson quiz with a plan that includes this NCLEX-RN pathway. You can still explore topic-filtered questions from the bank hubs below.