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Difficulty: Very hardTrauma and Burns

A 62-year-old man is brought to the emergency department after a motor vehicle collision in which he was an unrestrained driver. Paramedics report significant front-end vehicle damage. The patient's wife arrives and states he has a history of alcoholic cirrhosis and was hospitalized two months ago for abdominal distension requiring paracentesis. On presentation, his temperature is 36.8°C (98.2°F), blood pressure is 80/50 mm Hg, heart rate is 132/min, and respiratory rate is 24/min. He is confused but localizes to pain. His airway is patent and breath sounds are equal bilaterally. Physical examination reveals scleral icterus, spider angiomas on the chest, and a markedly distended abdomen with shifting dullness and a positive fluid wave. There is no overt abdominal guarding or rebound tenderness. The pelvis is stable to anterior-posterior and lateral compression. A bedside focused assessment with sonography for trauma (FAST) demonstrates a large volume of anechoic fluid in the hepatorenal recess (Morison pouch) and the splenorenal recess. Which of the following is the most appropriate next step in the management of this patient?

  1. Diagnostic peritoneal aspirationAnswer
  2. B
    Immediate exploratory laparotomy
  3. C
    Computed tomography of the abdomen and pelvis
  4. D
    Administration of broad-spectrum antibiotics and observation
  5. E
    Placement of a resuscitative endovascular balloon occlusion of the aorta

Answer

Diagnostic peritoneal aspiration is the most appropriate next step to differentiate pre-existing ascites from acute hemoperitoneum.
The correct next step is diagnostic peritoneal aspiration (DPA). According to Advanced Trauma Life Support (ATLS) guidelines, a hemodynamically unstable patient with blunt abdominal trauma and a positive FAST exam typically undergoes immediate exploratory laparotomy. However, this algorithm is heavily modified for patients with pre-existing ascites (e.g., from alcoholic cirrhosis). In these patients, the FAST exam will detect anechoic fluid regardless of whether abdominal trauma has occurred, making it impossible to distinguish baseline ascites from acute hemoperitoneum on ultrasound alone. Performing an unnecessary exploratory laparotomy in a cirrhotic patient is highly lethal due to severe coagulopathy, altered hemodynamics, and portal hypertension. Therefore, the fluid must be sampled via DPA. If the aspiration yields gross blood, the patient proceeds to the operating room. If it yields clear or straw-colored ascitic fluid, the physician must urgently search for alternative sources of shock (e.g., retroperitoneal hemorrhage, intrathoracic bleeding, or neurogenic shock) rather than subjecting the patient to a fatal surgery.

Step-by-Step Solution

1
Identify the patient's hemodynamic status.
The patient is in class III/IV hemorrhagic shock (blood pressure 80/50 mm Hg, heart rate 132/min).
Determines the appropriate algorithmic pathway (stable vs. unstable).
2
Interpret the primary survey and imaging.
FAST is positive for intra-abdominal fluid, but the patient has a known history of decompensated cirrhosis with ascites.
Establishes that the FAST result is confounded and cannot definitively diagnose an acute hemoperitoneum.
3
Determine the safest diagnostic intervention.
Diagnostic peritoneal aspiration (DPA) should be performed to check if the fluid is grossly bloody.
Avoids the catastrophic morbidity of a non-therapeutic exploratory laparotomy in a patient with severe portal hypertension.

Key Concept

In a hemodynamically unstable trauma patient with known ascites, a positive FAST exam is non-specific. Diagnostic peritoneal aspiration (DPA) must be performed to differentiate ascitic fluid from hemoperitoneum before proceeding to exploratory laparotomy.
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Trauma and Burns

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