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Difficulty: MediumLabor, Delivery, and Puerperium

A 32-year-old gravida 3, para 2 woman at 38 weeks gestation is admitted to the labor and delivery unit in active labor. Her prenatal course was uncomplicated. Her temperature is 37.1°C (98.8°F), blood pressure is 122/78 mmHg, and pulse is 84/min. The fetal heart rate baseline is 145/min with moderate variability and no decelerations. A sterile vaginal examination reveals the cervix is 5 cm dilated and 80% effaced, with the fetal vertex at -2 station and bulging amniotic membranes. Shortly after the examination, the patient experiences spontaneous rupture of membranes with a large gush of clear fluid. The continuous fetal monitor immediately records an abrupt decrease in the fetal heart rate to 75/min that does not resolve over the next 3 minutes. A repeat vaginal examination reveals a soft, pulsatile, rope-like mass in the vaginal vault extending past the fetal presenting part. Which of the following is the most appropriate next step in the management of this patient?

  1. Manually elevate the fetal presenting part and prepare for an emergency cesarean deliveryAnswer
  2. B
    Transfer directly to the operating room for a cesarean delivery without vaginal manipulation
  3. C
    Initiate a normal saline amnioinfusion through a transcervical catheter
  4. D
    Administer subcutaneous terbutaline to relax the uterus and observe for fetal heart rate recovery
  5. E
    Continue expectant management as this is a transient physiologic response to membrane rupture

Answer

Manually elevate the fetal presenting part and prepare for an emergency cesarean delivery.
The clinical scenario describes an overt umbilical cord prolapse, which occurs when the umbilical cord drops through the cervical os ahead of the fetal presenting part following the rupture of membranes. This typically happens when the presenting part is unengaged (e.g., -2 station). The prolapsed cord becomes compressed between the fetal head and the maternal pelvis, halting blood flow and causing sudden, profound fetal bradycardia. The immediate, life-saving management is to manually elevate the fetal presenting part off the umbilical cord to restore perfusion. The clinician's hand must remain in the vagina maintaining this elevation while the patient is rapidly transported to the operating room for an emergency cesarean delivery.

Step-by-Step Solution

1
Analyze the clinical presentation following the spontaneous rupture of membranes.
The patient developed profound, prolonged fetal bradycardia (75/min for over 3 minutes) accompanied by a palpable, pulsatile mass in the vaginal vault.
Identifying the physical exam finding alongside the fetal heart rate tracing is critical to establishing the correct diagnosis of umbilical cord prolapse.
2
Determine the immediate pathophysiologic threat to the fetus.
The fetal head (at -2 station) is actively compressing the prolapsed umbilical cord against the maternal pelvis, obstructing umbilical blood flow.
Understanding the mechanism of hypoxia dictates the need for immediate physical intervention rather than medical management alone.
3
Select the most appropriate evidence-based intervention.
The clinician must insert a hand into the vagina to manually elevate the fetal presenting part off the umbilical cord, maintaining this position while the patient is urgently transferred for an emergency cesarean delivery.
Relieving the mechanical compression restores fetal oxygenation and prevents irreversible hypoxic-ischemic encephalopathy or death while definitive surgical delivery is arranged.

Key Concept

Umbilical Cord Prolapse Management
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Topics

Labor, Delivery, and Puerperium

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