A 28-year-old multiparous woman (G3P2) at 29 weeks of gestation is brought to the hospital with heavy vaginal bleeding (estimated 400 mL) and severe lower abdominal pain. On examination, she is anxious, BP 100/62, HR 110, RR 22. Uterus is tender and rigid. Speculum examination shows blood pooling in the vagina with no cervical lesion. Ultrasound confirms a placenta completely covering the internal cervical os with a large retroplacental clot. Fetal heart rate is 145 bpm. What is the most appropriate next step?

Explanation

## Clinical Presentation & Diagnosis **Key Point:** This patient has placenta previa with signs of hemodynamic compromise (tachycardia, hypotension, tachypnea) and evidence of placental abruption (retroplacental clot, uterine tenderness/rigidity, severe pain). This is a **life-threatening emergency**. ## Red Flags Requiring Emergency Delivery ```mermaid flowchart TD A[Placenta previa with bleeding]:::outcome --> B{Hemodynamically stable?}:::decision B -->|Yes| C[Expectant management]:::action B -->|No: Hypotension, tachycardia, shock| D[Emergency cesarean]:::urgent A --> E{Signs of abruption?}:::decision E -->|Retroplacental clot, uterine tenderness, pain| F[Emergency cesarean]:::urgent E -->|No abruption| C ``` ## Why Emergency Cesarean Is Indicated **High-Yield:** Multiple danger signs mandate immediate surgical delivery: 1. **Hemodynamic Instability** — BP 100/62 with HR 110 indicates significant blood loss and shock. 2. **Retroplacental Clot** — Suggests concurrent placental abruption, which dramatically increases risk of: - Massive hemorrhage - Fetal distress/death - Maternal DIC and organ failure 3. **Uterine Tenderness & Rigidity** — Classic sign of abruption; indicates ongoing bleeding into the uterine wall. 4. **Severe Pain** — Abruption typically presents with pain (unlike isolated previa, which is painless). **Clinical Pearl:** The combination of previa + abruption is rare but catastrophic. The retroplacental clot visible on ultrasound is the key finding that shifts management from expectant to emergent. ## Delivery Method **Mnemonic: GENERAL ANESTHESIA in previa-abruption** — Avoid spinal/epidural in hemorrhagic shock (risk of cardiovascular collapse). General anesthesia allows rapid intubation, airway control, and hemodynamic support during massive transfusion. ## Why Other Options Are Wrong | Option | Why Incorrect | |--------|---------------| | Tocolytics + transfer | Tocolytics are contraindicated in hemorrhage/shock; patient is already unstable and needs immediate delivery, not transfer | | Amniocentesis | Invasive procedure in a bleeding, shocked patient; wastes critical time; fetal maturity is irrelevant when fetus is in acute danger | | Magnesium sulfate + await labor | Magnesium is for neuroprotection, not for hemorrhage management; expectant approach is fatal in a shocked patient with abruption | [cite:Park 26e Ch 16; Williams Obstetrics 26e Ch 34]