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Difficulty: HardLabor, Delivery, and Puerperium

A 26-year-old woman, gravida 1 para 0, at 39 weeks gestation is in the second stage of labor. She has been pushing for 2 hours and has functioning epidural anesthesia. Her temperature is 37.1°C (98.8°F), blood pressure is 112/72 mm Hg, and pulse is 88/min. Uterine contractions are occurring every 3 minutes and palpate strong. The fetal heart rate baseline was previously 135/min with moderate variability and no decelerations. Seven minutes ago, the fetal heart rate abruptly decreased to 75/min. Maternal repositioning to the left lateral decubitus position, administration of an intravenous fluid bolus, and initiation of supplemental oxygen were performed immediately, but the fetal heart rate remains at 75/min. Cervical examination shows complete dilation and 100% effacement. The fetal head is in the direct occiput anterior position at +3 station. Which of the following is the most appropriate next step in management?

  1. Operative vaginal deliveryAnswer
  2. B
    Emergency cesarean delivery
  3. C
    Administration of intravenous terbutaline
  4. D
    Amnioinfusion
  5. E
    Fetal scalp pH assessment

Answer

Operative vaginal delivery
This patient is experiencing a prolonged fetal heart rate deceleration (a drop of ≥15/min lasting ≥2 minutes but <10 minutes) that has not responded to standard intrauterine resuscitation measures (repositioning, supplemental oxygen, fluid bolus). This indicates an acute risk of fetal hypoxia and necessitates immediate, expedited delivery. The choice of delivery route depends on the stage of labor and the fetal station. In this case, the patient is completely dilated, and the fetal head is engaged and low in the maternal pelvis (+3 station) in a direct occiput anterior position. Under these specific conditions, an operative vaginal delivery (using forceps or a vacuum extractor) can be performed immediately at the bedside and is the absolute fastest way to deliver the fetus. Moving the patient to an operating room, preparing the surgical field, and obtaining surgical anesthesia to perform an emergency cesarean delivery would take significantly more time and is therefore less appropriate when the criteria for a safe instrumental delivery are fully met.

Step-by-Step Solution

1
Identify the fetal heart rate abnormality.
The fetal heart rate has decreased to 75/min for 7 minutes, which constitutes a prolonged deceleration (Category III tracing equivalent).
A decrease in fetal heart rate of 15 bpm or more lasting at least 2 minutes but less than 10 minutes is a prolonged deceleration, indicating potential severe fetal compromise.
2
Evaluate the response to intrauterine resuscitation.
Maternal position changes, intravenous fluids, and oxygen have not resolved the bradycardia after 7 minutes.
Unresolved prolonged decelerations require immediate, expedited delivery to prevent irreversible hypoxic-ischemic fetal injury.
3
Determine the fastest and safest route of delivery based on the clinical physical examination.
The cervix is completely dilated, and the fetal head is at +3 station in a direct occiput anterior position.
Because the prerequisites for an operative vaginal delivery (e.g., +2 station or lower, complete cervical dilation, known fetal position) are met, this is the most rapid method to achieve delivery compared to preparing for a cesarean section.

Key Concept

Management of prolonged fetal heart rate decelerations in the second stage of labor
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Topics

Labor, Delivery, and Puerperium

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