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Difficulty: EasyObstetric Complications

A 31-year-old G2P1 woman at 39 weeks gestation is admitted to the labor and delivery unit in active labor. Her most recent cervical examination shows 5 cm dilation, 80% effacement, and the fetal vertex at -2 station. Shortly after admission, the patient experiences spontaneous rupture of membranes with a large gush of clear amniotic fluid. Immediately following this event, the continuous fetal heart rate monitor demonstrates a sudden, prolonged deceleration, with the heart rate dropping to 60/min and remaining there. A prompt sterile vaginal examination is performed, which reveals a pulsating, rope-like structure palpable in the vaginal canal ahead of the fetal presenting part. Which of the following is the most appropriate next step in management?

  1. Manually elevate the fetal presenting part and prepare for emergency cesarean deliveryAnswer
  2. B
    Place the patient in the left lateral decubitus position and administer supplemental oxygen
  3. C
    Manually push the prolapsed structure back through the cervix into the uterine cavity
  4. D
    Begin a continuous amnioinfusion of warmed normal saline
  5. E
    Administer an intravenous bolus of oxytocin to rapidly accelerate labor progress

Answer

Manually elevate the fetal presenting part and prepare for emergency cesarean delivery
The clinical presentation of a sudden, prolonged fetal heart rate deceleration following rupture of membranes, combined with a palpable pulsating mass in the vagina, is diagnostic of umbilical cord prolapse. This is an acute obstetric emergency where the umbilical cord descends ahead of the fetal presenting part, leading to severe compression of the cord vessels between the fetus and the maternal pelvis. The most appropriate immediate management is to manually elevate the fetal presenting part off the prolapsed cord to restore fetal blood flow while simultaneously preparing for an emergent cesarean delivery.

Step-by-Step Solution

1
Identify the primary clinical diagnosis based on the physical exam findings.
The patient has an overt umbilical cord prolapse, evidenced by the palpable pulsating cord in the vagina following rupture of membranes.
Accurate diagnosis is required to triage the severity of the fetal bradycardia.
2
Determine the pathophysiologic consequence of the diagnosis.
The fetal head is compressing the prolapsed umbilical cord against the maternal pelvis, leading to absent blood flow and profound fetal hypoxia.
Understanding the mechanism of hypoxia dictates the required mechanical intervention.
3
Select the most appropriate definitive management.
The immediate priority is to physically lift the fetal head off the cord to restore perfusion, followed by rapid surgical delivery.
Prompt relief of compression is necessary to prevent permanent fetal neurologic injury or death.

Key Concept

The management of an overt umbilical cord prolapse requires immediate manual elevation of the fetal presenting part to relieve cord compression, followed by an emergent cesarean delivery.
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Topics

Obstetric Complications

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