A 28-year-old primigravida at 28 weeks of gestation presents with 300 mL of vaginal bleeding. She is hemodynamically stable (BP 118/76 mmHg, HR 88 bpm). Transvaginal ultrasound confirms placenta previa with the lower placental edge 1.5 cm above the internal cervical os. She is admitted for expectant management. On day 5 of hospitalization, she develops sudden onset of heavy vaginal bleeding (estimated 600 mL in 30 minutes) with hemoglobin drop from 10.2 to 8.5 g/dL. Fetal heart rate is 155 bpm with decreased variability. What is the most appropriate next step?

Explanation

## Clinical Scenario Analysis **Key Point:** This patient has progressed from **stable placenta previa to uncontrolled hemorrhage with fetal compromise** — a clear indication for **emergency cesarean delivery regardless of gestational age**. ## Indications for Urgent Delivery in Placenta Previa ### Absolute Indications for Immediate Cesarean Delivery 1. **Uncontrolled hemorrhage** (>500 mL or persistent bleeding despite transfusion) 2. **Maternal hemodynamic instability** (BP <90/60, HR >110, signs of shock) 3. **Fetal distress** (persistent bradycardia, absent/decreased variability, late decelerations) 4. **Preterm labor** with active contractions and cervical change ### This Case Meets Multiple Criteria | Finding | Status | Significance | |---------|--------|---------------| | **Bleeding volume** | 600 mL in 30 min | Uncontrolled hemorrhage | | **Hemoglobin drop** | 10.2 → 8.5 g/dL | Significant acute loss | | **Fetal heart rate** | 155 bpm (tachycardia) | Sign of fetal stress | | **Variability** | Decreased | Indicates fetal compromise | | **Gestational age** | 28 weeks | Previable; still requires delivery | **High-Yield:** Once maternal or fetal compromise occurs, **expectant management is abandoned** — delivery becomes the priority. ## Why Cesarean Delivery? **Clinical Pearl:** In placenta previa with hemorrhage: - **Cesarean is the ONLY safe delivery route** because vaginal delivery would require passage through/past the placenta - Vaginal delivery risks massive hemorrhage and fetal exsanguination - Tocolytics may be given briefly to allow transfer to OR and anesthesia preparation, but should not delay surgery ## Decision Algorithm ```mermaid flowchart TD A[Placenta Previa + Bleeding]:::outcome --> B{Hemodynamically stable<br/>+ Reassuring FHR?}:::decision B -->|Yes| C[Expectant Management]:::action B -->|No| D[Emergency Cesarean]:::urgent C --> E{Recurrent/Heavy bleeding<br/>or Fetal Compromise?}:::decision E -->|No| F[Continue Admission<br/>Plan Elective CS at 38-39 wks]:::action E -->|Yes| D D --> G[Prepare for Emergency CS<br/>Type & Cross, Anesthesia Alert]:::action G --> H[Cesarean Delivery<br/>Under GA if unstable]:::urgent ``` ## Why NOT Other Options? ### Option A: Continue Expectant Management **Warning:** Expectant management is only safe when: - Bleeding is **controlled** (no active heavy bleeding) - Mother is **hemodynamically stable** - Fetus shows **reassuring signs** This patient has **uncontrolled hemorrhage + fetal tachycardia + decreased variability** — all contraindications to continued expectant management. ### Option C: Amniocentesis for Lung Maturity **Trap:** Delaying delivery to assess fetal lung maturity is **dangerous** when: - Mother is hemorrhaging - Fetus is compromised - Delivery is already indicated At 28 weeks, the risk of respiratory distress is accepted as the lesser evil compared to maternal hemorrhagic shock or fetal death. ### Option D: Uterine Balloon Tamponade **Misconception:** Balloon tamponade (Bakri balloon, Foley catheter) is used for **postpartum hemorrhage** from uterine atony, not for placenta previa. In previa: - The bleeding source is the placental bed, not the uterine muscle - Balloon insertion may dislodge more placental tissue - It delays definitive (surgical) management **High-Yield:** Balloon tamponade is **NOT indicated** in antepartum hemorrhage from placenta previa.