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Difficulty: EasyLabor, Delivery, and Puerperium

A patient in her second pregnancy, having had one previous uncomplicated term birth, presents to the labor and delivery unit at 38 weeks and 4 days of gestation. She is experiencing regular, painful uterine contractions. Her vital signs are within normal limits. Cervical examination reveals 7 cm of dilation and 100% effacement with the fetal vertex at 0 station. External electronic fetal monitoring displays a baseline heart rate of 140/min with moderate variability. Over the next 20 minutes, the tracing shows recurrent, abrupt drops in the fetal heart rate to 90/min, each lasting approximately 40 seconds before returning rapidly to baseline. These drops vary in their timing relative to the peaks of the uterine contractions. What is the most appropriate next step in management for this patient?

  1. Assist the patient into a lateral decubitus positionAnswer
  2. B
    Perform a cesarean birth
  3. C
    Attempt a vacuum-assisted birth
  4. D
    Continue routine labor monitoring
  5. E
    Begin an oxytocin infusion

Answer

Assist the patient into a lateral decubitus position
The correct answer involves assisting the patient into a lateral decubitus position. The patient's fetal monitor tracing describes recurrent variable decelerations, characterized by an abrupt decrease in the fetal heart rate (onset to nadir in less than 30 seconds) that varies in its onset, depth, and duration relative to uterine contractions. Variable decelerations are caused by umbilical cord compression. The initial step in management is intrauterine resuscitation to alleviate this compression. Maternal repositioning (such as moving to the left or right lateral decubitus position) is the most appropriate first action, as it can quickly shift the fetus off the umbilical cord. If repositioning fails, an amnioinfusion may be considered for recurrent variable decelerations.

Step-by-Step Solution

1
Interpret the fetal heart rate tracing.
The tracing shows recurrent, abrupt decelerations with timing that varies relative to uterine contractions.
Identifying the specific pattern differentiates between early, late, and variable decelerations.
2
Determine the etiology of the decelerations.
Abrupt, variable decelerations are classically caused by umbilical cord compression.
Understanding the underlying pathophysiology guides the appropriate clinical intervention.
3
Select the most appropriate initial management.
The first-line management for umbilical cord compression is intrauterine resuscitation, starting with maternal repositioning.
Maternal repositioning shifts the fetus and often immediately relieves the pressure on the umbilical cord.

Key Concept

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

Labor, Delivery, and Puerperium

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