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Difficulty: MediumObstetric Complications

A hospitalized patient is evaluated in the labor unit. She is in her first pregnancy at 38 weeks of gestation and was admitted 3 hours ago in spontaneous active labor. Artificial rupture of membranes was performed shortly after admission, yielding a small amount of clear fluid. Her vital signs are temperature 37.0°C (98.6°F), blood pressure 118/72 mm Hg, and pulse 85/min. Uterine contractions are occurring every 3 to 4 minutes. Continuous electronic monitoring reveals a baseline fetal heart rate of 145/min with moderate variability. Coinciding with the majority of uterine contractions, the tracing shows recurrent, sudden drops in the heart rate to a nadir of 85/min. These decreases last for 30 to 50 seconds before rapidly recovering to the baseline rate. Which of the following is the most appropriate initial management for this patient?

  1. A
    Preparation for an immediate surgical delivery
  2. B
    Instillation of isotonic fluid into the uterine cavity
  3. Implementation of maternal lateral repositioningAnswer
  4. D
    Intravenous administration of a vasoactive agent
  5. E
    Maintenance of current expectant management

Answer

The most appropriate initial management is the implementation of maternal lateral repositioning.
The correct answer involves initiating first-line intrauterine resuscitation. The patient's fetal monitoring demonstrates recurrent variable decelerations, characterized by an abrupt decrease in heart rate (onset to nadir <30 seconds) and an abrupt return to baseline. Variable decelerations are caused by umbilical cord compression. The first step in management is always noninvasive maternal repositioning (e.g., left lateral decubitus position) to shift the weight of the fetus off the cord.

Step-by-Step Solution

1
Analyze the electronic fetal heart rate tracing description.
The tracing shows sudden, abrupt drops in heart rate that rapidly return to baseline.
Identifying the specific deceleration morphology (abrupt onset and offset) is required to diagnose variable decelerations, which distinguish them from late or early decelerations.
2
Determine the underlying pathophysiology of the diagnosed FHR pattern.
Variable decelerations indicate umbilical cord compression, likely exacerbated by the recent rupture of membranes (oligohydramnios).
Understanding the mechanism allows for targeted, etiology-specific intervention.
3
Select the most appropriate initial intervention based on the clinical algorithm.
Initial intrauterine resuscitation via maternal repositioning is chosen.
Maternal repositioning is the fastest, least invasive method to physically shift the fetus off the umbilical cord, potentially resolving the compression immediately.

Key Concept

Recurrent variable decelerations are caused by umbilical cord compression and are initially managed with noninvasive intrauterine resuscitation, starting with maternal repositioning.
Estimated Time:1m 0s
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Topics

Obstetric Complications

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