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Difficulty: EasyLabor, Delivery, and Puerperium

A 31-year-old nulliparous patient at 41 weeks gestation is admitted to the labor and delivery unit for induction of labor due to postterm pregnancy. She is currently receiving an intravenous oxytocin infusion. Her temperature is 37.0°C (98.6°F), blood pressure is 122/78 mmHg, and pulse is 88/min. Cervical examination reveals 5 cm dilation, 80% effacement, and -1 station. The external fetal monitor displays a baseline heart rate of 135/min with moderate variability. Over the past 40 minutes, the tracing reveals recurrent, gradual decreases in the fetal heart rate that begin consistently after the peak of each uterine contraction and do not return to baseline until the contraction has ended. Which of the following is the most appropriate next step in management?

  1. Discontinue the intravenous oxytocin infusionAnswer
  2. B
    Perform an emergency cesarean delivery
  3. C
    Initiate a transcervical amnioinfusion
  4. D
    Prepare for immediate forceps-assisted delivery
  5. E
    Reassure the patient and continue current observation

Answer

Discontinue the intravenous oxytocin infusion
The patient's fetal heart rate tracing describes late decelerations, characterized by a gradual decrease in fetal heart rate that begins after the peak of a uterine contraction and returns to baseline after the contraction has finished. Late decelerations are a sign of uteroplacental insufficiency and transient fetal hypoxemia. The most appropriate initial step in management is to perform intrauterine resuscitation to improve placental blood flow. This includes immediately discontinuing uterotonic agents (such as oxytocin) to reduce uterine activity, placing the patient in a lateral decubitus position to relieve aortocaval compression, administering an intravenous fluid bolus, and providing supplemental oxygen.

Step-by-Step Solution

1
Interpret the fetal heart rate (FHR) tracing described in the clinical vignette.
The FHR pattern shows late decelerations.
The decelerations are described as gradual and beginning after the peak of the uterine contraction, returning to baseline after the contraction ends.
2
Identify the underlying pathophysiology of this specific FHR pattern.
Uteroplacental insufficiency.
Late decelerations are classically caused by decreased blood flow and oxygen exchange across the placenta during contractions.
3
Determine the immediate next step in management.
Initiate intrauterine resuscitation by discontinuing oxytocin.
Removing uterine stimulation decreases contraction frequency and intensity, immediately improving placental perfusion and fetal oxygenation.

Key Concept

Intrapartum management of late fetal heart rate decelerations
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Topics

Labor, Delivery, and Puerperium

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