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Difficulty: Very hardInitial Stabilization and Triage

Following a high-speed collision with a commercial delivery van, a 31-year-old male pedestrian is airlifted to the regional trauma center. His electronic health record indicates no significant past medical history. During transport, the flight medical crew placed a rigid cervical collar and secured two large-bore peripheral intravenous catheters. Upon arrival, the patient is minimally responsive, groaning, and localizing to painful stimuli. Vital signs show a temperature of 35.8°C (96.4°F), blood pressure of 74/42 mm Hg, heart rate of 142/min, and respiratory rate of 28/min. His extremities are cool with weak, thready pulses. The primary survey reveals an unobstructed airway with bilateral and equal breath sounds. Evaluation of the abdomen demonstrates marked suprapubic ecchymosis and guarding. Gentle manual compression of the iliac crests reveals mechanical instability of the pelvic ring. A focused assessment with sonography for trauma (FAST) demonstrates an absence of free fluid in the pericardial, right upper quadrant, left upper quadrant, and pelvic views. A portable chest radiograph displays no acute cardiopulmonary abnormalities. Which of the following is the most appropriate next step in the immediate stabilization of this patient?

  1. A
    Transport to the radiology department for computed tomography angiography
  2. Application of a circumferential binding device centered over the greater trochantersAnswer
  3. C
    Transfer to the operating suite for an exploratory laparotomy
  4. D
    Bolus administration of two liters of warmed isotonic crystalloid fluid
  5. E
    Performance of a retrograde cystourethrogram to evaluate the lower urinary tract

Answer

Application of a circumferential binding device centered over the greater trochanters
The patient presents in severe hemorrhagic shock due to blunt force trauma. The physical findings of suprapubic ecchymosis and a mechanically unstable pelvis strongly indicate an unstable pelvic ring fracture. These fractures commonly cause massive, life-threatening retroperitoneal hemorrhage stemming from the presacral venous plexus and cancellous bone ends. Because the FAST examination is negative, massive intraperitoneal bleeding is effectively ruled out. Therefore, the single most urgent stabilization intervention is mechanical hemorrhage control via the application of a circumferential pelvic binder, which must be centered over the greater trochanters (not the iliac crests). This non-invasive maneuver reduces the pelvic volume, creating a tamponade effect that slows or stops venous bleeding, and it stabilizes the fracture fragments to prevent further vascular injury. This step must precede diagnostic imaging and should be performed concurrently with the initiation of a massive transfusion protocol.

Step-by-Step Solution

1
Assess the patient's hemodynamic status and classify the type of shock.
The patient is in profound hemorrhagic shock, evidenced by a blood pressure of 74/42 mm Hg, a heart rate of 142/min, and cool extremities.
To prioritize interventions based on the 'Circulation' component of the Advanced Trauma Life Support (ATLS) primary survey.
2
Correlate physical examination findings with bedside diagnostics to localize the source of hemorrhage.
The FAST exam is negative, ruling out massive intraperitoneal bleeding. The pelvic examination reveals mechanical instability and suprapubic ecchymosis.
To differentiate between intraperitoneal and retroperitoneal sources of bleeding, which dictate entirely different stabilization pathways.
3
Implement targeted mechanical stabilization for the identified injury.
A pelvic binder is immediately applied over the greater trochanters.
To rapidly reduce the pelvic volume, thereby promoting venous tamponade and providing hemostatic control of the life-threatening retroperitoneal hemorrhage.

Key Concept

In hemodynamically unstable trauma patients with a suspected pelvic fracture and a negative FAST exam, the immediate stabilization step is the application of a pelvic binder to tamponade retroperitoneal venous bleeding.
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Topics

Initial Stabilization and Triage

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