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Difficulty: MediumInterpreting Imaging Results

A 28-year-old man is brought to the emergency department via ambulance after being the unrestrained driver in a high-speed motor vehicle collision. On arrival, he is confused and diaphoretic. His temperature is 36.8∘C36.8^\circ\text{C} (98.2∘F98.2^\circ\text{F}), pulse is 132/min132/\text{min}, respirations are 22/min22/\text{min}, and blood pressure is 82/50 mmHg82/50\text{ mmHg}. Oxygen saturation is 96% on a non-rebreather mask. The airway is patent, and breath sounds are equal bilaterally. Intravenous access is established, and volume resuscitation is initiated. A portable chest radiograph reveals no abnormalities, and a pelvic radiograph shows no fractures. A Focused Assessment with Sonography for Trauma (FAST) examination demonstrates a distinct anechoic strip between the right kidney and the liver, as well as an anechoic fluid collection in the rectovesical pouch. Based on the interpretation of these imaging findings and the patient's clinical status, which of the following is the most appropriate next step in management?

  1. Proceed to emergent exploratory laparotomyAnswer
  2. B
    Perform a computed tomography (CT) scan of the abdomen and pelvis with intravenous contrast
  3. C
    Administer a rapid bolus of intravenous crystalloid and repeat the ultrasound examination
  4. D
    Perform a diagnostic peritoneal lavage (DPL)
  5. E
    Admit to the surgical intensive care unit for massive transfusion and serial abdominal examinations

Answer

Proceed to emergent exploratory laparotomy
The correct sequence of management for blunt abdominal trauma depends on the patient's hemodynamic status and the interpretation of the Focused Assessment with Sonography for Trauma (FAST) examination. The FAST exam is designed to rapidly identify free intraperitoneal fluid. In this patient, the 'anechoic strip' between the liver and right kidney (Morison's pouch) and fluid in the rectovesical pouch indicates a massive hemoperitoneum. When a patient has a positive FAST scan combined with hemodynamic instability (hypotension, tachycardia, altered mental status), the standard of care is to bypass further imaging and proceed directly to an emergent exploratory laparotomy for definitive hemorrhage control.

Step-by-Step Solution

1
Assess the patient's hemodynamic status.
The patient is in hemorrhagic shock, evidenced by a pulse of 132/min and a blood pressure of 82/50 mmHg.
Hemodynamic instability dictates the diagnostic and therapeutic algorithm in trauma patients.
2
Interpret the imaging findings provided in the vignette.
The FAST exam shows an anechoic strip in Morison's pouch (between the liver and right kidney) and fluid in the rectovesical pouch.
Anechoic (black) areas on ultrasound in dependent spaces of the abdomen represent free fluid, which in the setting of trauma is presumed to be blood (hemoperitoneum).
3
Determine the next management step based on the synthesis of clinical and radiographic data.
A positive FAST exam in a hemodynamically unstable patient requires immediate surgical intervention.
Definitive control of intra-abdominal hemorrhage can only be achieved via laparotomy; further diagnostic testing would unnecessarily delay life-saving care.

Key Concept

Management of blunt abdominal trauma based on FAST interpretation
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Topics

Interpreting Imaging Results

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