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Difficulty: Very hardTrauma and Burns

A 32-year-old female, gravida 1, para 0, at 35 weeks gestation, is brought to the trauma center following a high-speed motor vehicle collision. She was a restrained passenger. On arrival, she is lethargic, confused, and oriented only to her name. Her husband, who was driving and sustained minor injuries, is present in the trauma bay and demands that the medical team focus exclusively on saving the fetus. A card discovered in the patient's wallet legally designates her sister as her healthcare proxy.

Evaluation reveals a patent airway and symmetric vesicular breath sounds bilaterally. Vital signs include a heart rate of 142/min, respiratory rate of 26/min, and blood pressure of 76/40 mm Hg. Pulse oximetry is 98% on room air. The patient is placed on a backboard with manual left uterine displacement. An initial fluid bolus is administered with minimal hemodynamic improvement.

Arterial blood gas analysis on room air reveals:
ParameterValue
pH7.46
PaO298 mm Hg
PaCO228 mm Hg

Extended focused assessment with sonography for trauma (E-FAST) demonstrates a large anechoic collection in the splenorenal recess. There is no evidence of pneumothorax. Fetal heart rate monitoring demonstrates a baseline of 105/min with minimal variability and recurrent late decelerations.

Which of the following is the most appropriate next step in the management of this patient?

  1. Immediate exploratory laparotomyAnswer
  2. B
    Computed tomography angiography of the abdomen and pelvis
  3. C
    Emergency cesarean delivery
  4. D
    Initiate targeted medical therapy to correct the respiratory alkalosis
  5. E
    Request informed consent for surgery from the patient's husband

Answer

The most appropriate next step is an immediate exploratory laparotomy to control the intra-abdominal hemorrhage.
In the setting of acute trauma, a hemodynamically unstable patient with a positive FAST exam requires immediate operative intervention. For this pregnant patient, the free fluid in the splenorenal recess confirms intra-abdominal hemorrhage. The fundamental principle of trauma management in pregnancy is that optimal fetal resuscitation is achieved through aggressive maternal resuscitation. Therefore, the immediate priority is an exploratory laparotomy to stop the bleeding. The fetal distress (late decelerations and baseline bradycardia) is a direct consequence of maternal hypovolemia and uteroplacental hypoperfusion; resolving the maternal shock is the most effective treatment for the fetus.

Step-by-Step Solution

1
Assess the patient's hemodynamic status and trauma primary survey.
The patient is in Class III/IV hemorrhagic shock (HR 142/min, BP 76/40 mm Hg) with altered mental status.
Establishing hemodynamic stability dictates whether the patient can safely undergo imaging (CT) or requires emergent surgical intervention.
2
Evaluate the E-FAST and fetal monitoring results.
E-FAST shows intra-abdominal bleeding (splenorenal fluid). Fetal monitoring shows distress secondary to maternal hypoperfusion.
Identifying the source of bleeding in an unstable patient determines the surgical target (e.g., laparotomy for abdominal fluid).
3
Determine the optimal intervention factoring in pregnancy and ethical constraints.
Maternal stabilization takes absolute precedence. Implied consent applies for emergent life-saving surgery.
Treating the mother's hemorrhage is the only way to restore uteroplacental perfusion. Delaying for consent or fetal delivery increases mortality for both.

Key Concept

In pregnant trauma patients who are hemodynamically unstable with a positive FAST exam, immediate exploratory laparotomy is the indicated next step; maternal resuscitation always takes precedence over fetal intervention.
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Trauma and Burns

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