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Difficulty: MediumObstetric Complications

A 31-year-old gravida 2, para 1 woman at 35 weeks gestation is brought to the emergency department due to sudden-onset, severe, continuous abdominal pain and moderate dark vaginal bleeding. Her pregnancy is complicated by chronic hypertension, for which she takes labetalol. Her blood pressure is 165/100 mm Hg, and her pulse is 115/min. On physical examination, the uterus is hypertonic, rigid, and exquisitely tender to palpation. Fetal monitoring reveals a baseline heart rate of 165/min with minimal variability and recurrent late decelerations. The tocodynamometer demonstrates high-frequency, low-amplitude contractions. Maternal repositioning, supplemental oxygen, and an intravenous fluid bolus have been administered, but the fetal heart rate tracing remains unchanged. Which of the following is the most appropriate next step in management?

  1. A
    Administration of magnesium sulfate
  2. B
    Pelvic ultrasound to evaluate placental location
  3. Emergency cesarean deliveryAnswer
  4. D
    Amnioinfusion
  5. E
    Administration of oxytocin

Answer

Emergency cesarean delivery
The patient's clinical presentation of sudden, severe abdominal pain, a rigid and tender uterus, dark vaginal bleeding, and tachysystole in the setting of chronic hypertension is highly characteristic of placental abruption (abruptio placentae). The fetal monitoring shows a baseline of 165/min, minimal variability, and recurrent late decelerations despite appropriate intrauterine resuscitative measures (repositioning, supplemental oxygen, and intravenous fluids). This indicates severe uteroplacental insufficiency and impending fetal acidemia. In the presence of a nonreassuring fetal heart rate tracing (Category III) and active placental abruption, the most appropriate next step is an emergent surgical delivery to prevent fetal demise and control maternal hemorrhage.

Step-by-Step Solution

1
Identify the primary diagnosis based on the maternal clinical presentation.
The combination of sudden and severe abdominal pain, dark vaginal bleeding, a rigid uterus, and maternal chronic hypertension strongly indicates placental abruption (abruptio placentae).
These are the classic signs of premature separation of the placenta from the uterine wall.
2
Evaluate the fetal status based on the monitoring data.
The fetal heart rate tracing shows fetal tachycardia, minimal variability, and recurrent late decelerations despite adequate intrauterine resuscitative measures.
This indicates severe uteroplacental insufficiency and impending fetal acidemia (Category III tracing).
3
Determine the optimal management plan.
The presence of placental abruption complicated by a nonreassuring fetal heart rate tracing necessitates immediate surgical intervention.
Continued expectant management or delaying for imaging will lead to fetal demise and can rapidly worsen maternal hemorrhage and coagulopathy.

Key Concept

Management of placental abruption with fetal distress
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Topics

Obstetric Complications

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