A 28-year-old primigravida at 32 weeks of gestation presents to the emergency department with complaints of vaginal bleeding and lower abdominal pain for the past 4 hours. On examination, she is hemodynamically stable with blood pressure 128/82 mmHg and heart rate 92 bpm. Speculum examination shows active bleeding from the cervix. Ultrasound reveals a low-lying placenta with the lower edge 1.5 cm from the internal cervical os. Fetal heart rate is 148 bpm with normal variability. What is the most appropriate immediate management?

Explanation

## Clinical Context This patient has placenta previa (lower placental edge <2 cm from internal os) presenting with vaginal bleeding at 32 weeks — a classic high-risk pregnancy scenario requiring urgent but measured intervention. ## Management Principles for Preterm Labor with Placenta Previa **Key Point:** Placenta previa is an absolute contraindication to digital cervical examination, as it can precipitate catastrophic hemorrhage. **High-Yield:** The "golden rule" in preterm labor with placenta previa is: 1. **Avoid digital cervical examination** — use ultrasound assessment only 2. **Admit for observation** — bleeding may be self-limited 3. **Administer corticosteroids** (betamethasone 12 mg IM × 2 doses, 24 hours apart) to accelerate fetal lung maturity and reduce neonatal morbidity/mortality 4. **Bed rest** — reduces uterine irritability and further bleeding 5. **Tocolytics** — controversial in placenta previa but may be considered if preterm contractions are documented ## Why This Approach? At 32 weeks with a stable mother and reassuring fetal status (normal FHR with variability), expectant management with hospitalization is standard. The fetus has reasonable chances of survival with neonatal intensive care. Corticosteroids reduce respiratory distress syndrome risk by ~50% and neonatal death by ~30% [cite:ACOG Practice Bulletin 188]. **Clinical Pearl:** Even with active bleeding, if mother and fetus are hemodynamically stable, cesarean delivery is deferred unless bleeding becomes uncontrolled or fetal distress develops. Expectant management can extend pregnancy by weeks, allowing further fetal maturation. ## Triage Algorithm ```mermaid flowchart TD A["Preterm labor + Vaginal bleeding"]:::outcome --> B{"Placenta previa?"}:::decision B -->|Yes| C["Speculum exam only"]:::action B -->|No| D["Digital cervical exam OK"]:::action C --> E{"Stable mother & fetus?"}:::decision E -->|Yes| F["Admit, bed rest, corticosteroids"]:::action E -->|No| G["Cesarean delivery"]:::urgent D --> H["Assess for ROM, infection, labor"]:::action H --> I{"Preterm labor confirmed?"}:::decision I -->|Yes| J["Tocolytics + corticosteroids"]:::action I -->|No| K["Discharge or observation"]:::action ```