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Difficulty: MediumObstetric Complications

A 26-year-old primigravid woman at 40 weeks gestation is evaluated in the labor and delivery unit. She was admitted earlier today for induction of labor due to oligohydramnios. The patient is currently receiving a continuous intravenous oxytocin infusion. Her cervix is 6 cm dilated, 100% effaced, and the fetal presenting part is at 0 station. Maternal temperature is 37.1°C (98.8°F), blood pressure is 122/78 mm Hg, and pulse is 88/min. Uterine contractions are occurring every 3 minutes. Continuous fetal heart rate monitoring demonstrates a baseline of 140/min with moderate variability. Over the past 20 minutes, there are recurrent, gradual decreases in the fetal heart rate; the nadir of each decrease consistently occurs after the peak of the associated uterine contraction, with a slow return to baseline. Which of the following is the most appropriate next step in the management of this patient?

  1. A
    Administer intravenous terbutaline
  2. B
    Perform an amnioinfusion
  3. Discontinue the oxytocin infusion and reposition the patient laterallyAnswer
  4. D
    Proceed to immediate cesarean delivery
  5. E
    Reassure the patient as this pattern represents physiologic fetal head compression

Answer

Discontinue the oxytocin infusion and reposition the patient laterally
The correct answer is to discontinue the oxytocin infusion and reposition the patient laterally. The patient's fetal heart rate tracing demonstrates recurrent late decelerations, which are defined as gradual decreases in the fetal heart rate with a nadir occurring after the peak of the uterine contraction. Late decelerations indicate uteroplacental insufficiency and transient fetal hypoxemia. The initial management is intrauterine resuscitation to improve placental perfusion and fetal oxygenation. This includes maternal repositioning (e.g., left lateral decubitus to relieve aortocaval compression), discontinuing uterotonics such as oxytocin, administering an intravenous fluid bolus, and providing maternal oxygen.

Step-by-Step Solution

1
Analyze the fetal heart rate tracing description in the clinical vignette.
The tracing reveals a pattern of gradual decreases with the nadir consistently occurring after the peak of the uterine contractions.
Correct interpretation of the fetal heart rate pattern is essential for accurate diagnosis.
2
Correlate the identified pattern with its underlying pathophysiology.
The pattern is identified as late decelerations, which indicate uteroplacental insufficiency and transient fetal hypoxemia.
Understanding the etiology dictates the appropriate clinical intervention.
3
Determine the next best step in management for uteroplacental insufficiency in a laboring patient on oxytocin.
Select intrauterine resuscitative measures, specifically discontinuing the oxytocin infusion and repositioning the patient.
These conservative measures can quickly restore placental perfusion and oxygenation, and must be attempted prior to considering surgical delivery.

Key Concept

Intrauterine resuscitation for recurrent late decelerations
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Topics

Obstetric Complications

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