A 32-year-old primigravida at 28 weeks gestation presents to the emergency department with painless vaginal bleeding of 200 mL. Vitals are stable (BP 118/76 mmHg, HR 88/min). Obstetric examination reveals a soft, non-tender uterus. Transabdominal ultrasound confirms complete placenta previa with a live, normally grown fetus. What is the most appropriate immediate next step in management?

Explanation

## Clinical Context This is a stable patient with complete placenta previa presenting with mild bleeding at 28 weeks gestation — a scenario that demands **expectant (conservative) management** rather than immediate delivery. ## Management Algorithm for Placenta Previa ```mermaid flowchart TD A[Placenta Previa + Bleeding]:::outcome --> B{Maternal/Fetal Stability?}:::decision B -->|Stable, <34 weeks| C[Admit for Expectant Management]:::action B -->|Unstable or >34 weeks| D[Prepare for Cesarean Delivery]:::action C --> E[Bed rest, IV access, Cross-matched blood]:::action C --> F[Antenatal corticosteroids if <34 weeks]:::action C --> G[Repeat USS at 34-36 weeks]:::action D --> H[Cesarean at 36-37 weeks or on-demand if bleeding]:::action ``` ## Key Management Principles **Key Point:** Expectant management is the standard of care for **stable** patients with placenta previa before 34 weeks gestation, aiming to maximize fetal maturity while avoiding unnecessary preterm delivery. **High-Yield:** The "tocolytic window" — if bleeding stops and patient remains stable, continuation of pregnancy is safe and beneficial. Steroids (betamethasone 12 mg IM × 2 doses, 24 h apart) reduce neonatal respiratory distress by ~50% at 28–34 weeks. **Clinical Pearl:** Complete (central) placenta previa has a ~10–15% risk of recurrent bleeding; partial previa has ~5% risk. Expectant management reduces unnecessary preterm births without increasing maternal or fetal mortality in hemodynamically stable cases. ## Why Expectant Management Here | Criterion | This Case | Implication | |-----------|-----------|-------------| | Maternal stability | BP 118/76, HR 88 | Safe for observation | | Fetal status | Live, normally grown | No acute distress | | Gestational age | 28 weeks | Significant prematurity risk if delivered now | | Bleeding volume | 200 mL (mild) | Not massive hemorrhage | | Previa type | Complete | Absolute contraindication to vaginal delivery | **Correct Management Bundle:** 1. **Admission** to hospital (not discharge) 2. **Bed rest** (reduces uterine irritability) 3. **IV access** and cross-matched blood (for emergency transfusion if needed) 4. **Antenatal corticosteroids** (betamethasone or dexamethasone) 5. **Fetal monitoring** (NST, USS) 6. **Planned cesarean at 36–37 weeks** (or sooner if uncontrolled bleeding or labor) ## Rationale Against Other Options **Cesarean section at 28 weeks:** Increases neonatal morbidity (respiratory distress, intraventricular hemorrhage, necrotizing enterocolitis) without maternal benefit in a stable patient. Reserved for **uncontrolled hemorrhage, fetal distress, or labor**. **Digital cervical examination:** **Absolute contraindication** in placenta previa — risk of catastrophic placental disruption and massive hemorrhage. Transvaginal USS only if needed to confirm diagnosis. **Discharge home:** Dangerous. Recurrent bleeding is common; patient needs immediate access to blood products and cesarean capability. [cite:Williams Obstetrics 26e Ch 34]