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Difficulty: MediumObstetric Complications

A woman in her first pregnancy is brought to the emergency department at 36 weeks and 4 days of gestation complaining of acute difficulty breathing. She reports a two-day history of a severe, unremitting headache and visual scotomas. She has no significant past medical history and takes no medications. Vital signs are temperature 37.0°C (98.6°F), blood pressure 182/114 mmHg, pulse 112/min, and respirations 28/min. Oxygen saturation is 86% on room air. Physical examination reveals generalized facial puffiness and marked pitting edema of both lower extremities extending to the knees. Auscultation of the lungs reveals diffuse bilateral crackles in the lower and middle lung fields. A continuous fetal monitor is placed. The uterine tocodynamometer shows contractions every 4 minutes. The fetal heart rate tracing reveals a baseline of 145/min, moderate variability, and recurrent, gradual decreases in heart rate with nadirs occurring after the peaks of the contractions. Which of the following is the most appropriate initial step in the management of this patient?

  1. Administration of supplemental oxygen and intravenous furosemideAnswer
  2. B
    Immediate transfer to the operating room for a cesarean delivery
  3. C
    Reassurance and repositioning in the left lateral decubitus position
  4. D
    Initiation of empiric intravenous broad-spectrum antibiotics
  5. E
    Administration of nebulized albuterol and systemic corticosteroids

Answer

Administration of supplemental oxygen and intravenous furosemide is required to stabilize the mother's acute pulmonary edema prior to any operative intervention.
The correct intervention is the administration of supplemental oxygen and intravenous furosemide. This patient is experiencing acute pulmonary edema secondary to preeclampsia with severe features, a life-threatening obstetric complication caused by increased systemic vascular resistance, endothelial damage, and decreased plasma oncotic pressure. Although the fetal heart rate tracing shows late decelerations (indicating uteroplacental insufficiency), maternal stabilization is the absolute first priority. Immediate management includes oxygen supplementation, loop diuretics (furosemide) to reduce preload and pulmonary fluid, and blood pressure control. Only after the mother is hemodynamically stable should the team proceed with delivery, which is the definitive treatment for preeclampsia.

Step-by-Step Solution

1
Identify the primary maternal clinical syndrome based on vital signs and physical exam.
Severe hypertension, unremitting headache, scotomas, generalized edema, and bilateral pulmonary crackles indicate preeclampsia with severe features complicated by acute pulmonary edema.
Recognizing the life-threatening complication of preeclampsia dictates the urgency and type of medical intervention needed.
2
Interpret the fetal heart rate (FHR) tracing findings.
Gradual decreases in heart rate with nadirs occurring after the peak of contractions indicate late decelerations, a sign of uteroplacental insufficiency.
Fetal status must be evaluated alongside maternal status, as maternal hypoxemia often causes secondary fetal distress.
3
Determine the prioritized next step in management.
Maternal hemodynamic and respiratory stabilization must precede delivery.
Anesthetizing and operating on an unstable, severely hypoxemic patient carries an unacceptably high risk of maternal mortality. Oxygen and loop diuretics will improve maternal oxygenation and consequently improve the fetal status.

Key Concept

In patients presenting with acute obstetric emergencies such as preeclamptic pulmonary edema combined with fetal distress, maternal stabilization (using oxygen, antihypertensives, and diuretics) must always precede emergency delivery.
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Topics

Obstetric Complications

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