A 28-year-old G2P1 woman at 32 weeks gestation presents with acute onset of severe lower abdominal pain and vaginal bleeding following a motor vehicle accident. On examination, she is tachycardic (HR 118/min), hypotensive (BP 92/58 mmHg), with a rigid, tender uterus. Fetal heart rate monitoring shows variable decelerations and bradycardia. Obstetric ultrasound reveals a retroplacental hypoechoic collection and thickened placenta. The structure marked **D** in the diagram shows fetal cardiac activity with abnormal heart rate patterns. What is the most appropriate immediate management step for this patient?

Explanation

## Why "Establish large-bore IV access, initiate fluid resuscitation, and prepare for emergency cesarean delivery" is right Placental abruption is an obstetric emergency characterized by premature separation of the placenta from the uterine wall, causing fetal hypoxia and maternal hemorrhage. The clinical presentation here—painful vaginal bleeding, uterine tenderness, maternal hypotension out of proportion to visible bleeding, and fetal distress (bradycardia and variable decelerations) on heart rate monitoring (structure **D**)—is pathognomonic for severe abruption. According to Williams Obstetrics 26e, the cardinal features include (1) painful vaginal bleeding, (2) uterine tenderness with tetany, (3) fetal distress, and (4) maternal shock disproportionate to visible hemorrhage due to concealed bleeding. At term or near-term (32 weeks with severe abruption and fetal distress), immediate delivery is mandated. Management requires maternal resuscitation with large-bore IV access, aggressive fluid and blood product replacement, and emergency cesarean delivery because fetal distress and maternal hemodynamic instability preclude safe vaginal delivery. ## Why each distractor is wrong - **Administer antenatal corticosteroids and observe for 48 hours with expectant management**: Expectant management is reserved for STABLE, MILD abruption at preterm gestations. This patient has SEVERE abruption with maternal shock, fetal distress, and abnormal heart rate patterns—expectant management is contraindicated and delays life-saving delivery. - **Perform digital cervical examination to assess cervical dilation and labor progression**: Digital cervical examination is contraindicated in suspected placental abruption until placental location is confirmed (to rule out placenta previa). Moreover, this patient requires emergency delivery, not assessment of labor progress. - **Administer magnesium sulfate and delay delivery until fetal lung maturity is achieved**: Magnesium sulfate is indicated for fetal neuroprotection at <32 weeks in stable preterm abruption, but this patient is at 32 weeks with severe abruption, maternal shock, and fetal distress. Delaying delivery to achieve lung maturity will result in maternal death and fetal death—delivery cannot be delayed. **High-Yield:** Placental abruption with fetal distress on heart rate monitoring is an obstetric emergency requiring immediate delivery and maternal resuscitation; maternal hemodynamic instability out of proportion to visible bleeding indicates concealed hemorrhage—a hallmark of severe abruption. [cite: Williams Obstetrics 26e, Chapter 42: Placental Abruption]