A 34-year-old gravida 3, para 2 at 37 weeks gestation is brought to the labor and delivery… — USMLE Step 2 CK

A $34$ -year-old gravida $3$ , para $2$ at $37$ weeks gestation is brought to the labor and delivery triage complaining of a sudden onset of intense, constant abdominal pain accompanied by a moderate amount of dark red vaginal bleeding. Her medical history is significant for chronic hypertension. Her vital signs show a temperature of $37.1^\circ\text{C}$ ( $98.8^\circ\text{F}$ ), blood pressure of $168/105\text{ mmHg}$ , heart rate of $112/\text{min}$ , and respiratory rate of $18/\text{min}$ . Physical examination reveals a uniformly rigid and exquisitely tender uterus. A bedside ultrasound confirms a live fetus in cephalic presentation but does not visualize a retroplacental hematoma. Laboratory studies display a hemoglobin level of $10.6\text{ g/dL}$ and a platelet count of $140,000/\text{mm}^3$ . The continuous fetal monitor indicates a baseline heart rate of $105/\text{min}$ , absent variability, and recurrent late decelerations. Which of the following is the most appropriate next step in the management of this patient?

A
Artificial rupture of the fetal membranes and internal scalp monitoring
B
Maternal administration of labetalol and continuous fetal monitoring
C
Transfusion of packed red blood cells
Emergent surgical delivery of the fetusAnswer
E
Maternal repositioning, fluid bolus, and observation for labor progression

Answer

The most appropriate next step is emergent surgical delivery of the fetus.

The correct answer involves immediately proceeding to the operating room for an emergent surgical delivery. This patient's presentation of sudden, severe abdominal pain, dark vaginal bleeding, and a rigid, tender uterus is highly characteristic of placental abruption, an obstetric emergency involving premature separation of the placenta. The continuous fetal monitor shows a baseline bradycardia (

105/\text{min}

), absent variability, and recurrent late decelerations, which define a Category III fetal heart rate tracing. This pattern indicates severe uteroplacental insufficiency, fetal hypoxia, and acidemia. When a Category III tracing occurs secondary to a placental abruption, and vaginal delivery is not imminent, the standard of care is an immediate emergent cesarean delivery to save the life of the fetus and control maternal hemorrhage.

Step-by-Step Solution

Evaluate the maternal and fetal clinical presentation.

The patient exhibits signs of placental abruption (sudden severe abdominal pain, rigid uterus, dark vaginal bleeding) and the fetal monitor shows a Category III tracing (baseline

105/\text{min}

, absent variability, late decelerations).

Initial obstetric triage requires assessing both maternal hemodynamic stability and fetal well-being to determine the urgency of intervention.

Determine the necessary intervention based on the fetal heart rate tracing.

A Category III tracing indicates severe fetal acidemia and impending fetal demise, necessitating immediate resolution.

Category III tracings are abnormal and predictive of abnormal fetal acid-base status at the time of observation, requiring prompt intervention.

Select the optimal mode of delivery.

Emergent surgical delivery (cesarean section) is the most appropriate definitive management.

Since vaginal delivery is not imminent in a patient who just arrived at triage, an emergent laparotomy is required to quickly deliver the compromised fetus and control the abruption.

Key Concept

Severe placental abruption complicated by a Category III fetal heart rate tracing requires immediate emergent surgical delivery to prevent fetal demise.

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