A 28-year-old multigravida (G3P2) at 38 weeks gestation with a history of two prior vaginal deliveries presents for routine antenatal care. Ultrasound shows a complete placenta previa with the placental edge 1.5 cm from the internal cervical os. She is hemodynamically stable with no vaginal bleeding. She asks about the mode of delivery. What is the most appropriate next step in management?

Explanation

## Clinical Scenario Analysis This patient has **complete placenta previa** — a clear indication for planned cesarean delivery. ### Classification and Management of Placenta Previa | Previa Type | Definition | Management | |---|---|---| | Complete | Placenta covers entire internal os | **Cesarean delivery** (planned at 39 weeks) | | Partial | Placenta partially covers internal os | **Cesarean delivery** (planned at 39 weeks) | | Marginal | Placental edge within 2 cm of internal os | Cesarean delivery (planned at 39 weeks) OR trial of labor if no bleeding | | Low-lying | Placental edge >2 cm from internal os | Vaginal delivery usually safe; repeat ultrasound at 34 weeks | **Key Point:** This patient has complete previa with placental edge 1.5 cm from the os — this is **NOT** marginal previa and does NOT qualify for trial of labor. ### Why Cesarean Delivery at 39 Weeks? 1. **Absolute indication:** Complete placenta previa carries risk of: - Massive antepartum hemorrhage (especially with labor onset or ROM) - Placental separation during labor - Fetal compromise from hemorrhage - Maternal shock and death 2. **Timing:** 39 weeks is standard because: - Fetal lung maturity is assured - Risk of preterm complications is minimized - Planned cesarean (not emergent) allows for controlled delivery and blood product availability 3. **Prior vaginal deliveries do NOT change management** — complete previa is an absolute contraindication to vaginal delivery regardless of obstetric history. **High-Yield:** ACOG recommends hospitalization from 34 weeks onward for patients with placenta previa and any vaginal bleeding; however, for asymptomatic patients, outpatient management with strict precautions (pelvic rest, no intercourse, immediate evaluation if bleeding) is acceptable until 39 weeks. **Clinical Pearl:** Vaginal delivery with placenta previa = unacceptable fetal and maternal risk. There is no role for trial of labor, oxytocin challenge, or expectant management beyond 39 weeks. [cite:ACOG Practice Bulletin 208]