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Difficulty: MediumOrthopedic Surgery

A 26-year-old man is hospitalized after sustaining a closed mid-shaft fracture of the right femur in a motor vehicle collision. Due to multiple life-threatening cases in the operating room, his fracture is temporarily managed with skeletal traction. On the second day of hospitalization, he becomes acutely confused and agitated. His temperature is 38.3°C (100.9°F), blood pressure is 118/76 mmHg, heart rate is 122/min, and respiratory rate is 28/min. Pulse oximetry shows an oxygen saturation of 86% on room air. Physical examination reveals a non-blanching petechial rash over the anterior chest, axillae, and conjunctivae. Lung auscultation demonstrates bilateral scattered crackles. Which of the following interventions during the initial 24 hours of admission would have most effectively decreased the risk of this patient's current complication?

  1. Early operative internal fixation of the femur fractureAnswer
  2. B
    Initiation of prophylactic low-molecular-weight heparin
  3. C
    Conservative management with prolonged skeletal traction
  4. D
    Administration of prophylactic intravenous corticosteroids
  5. E
    Empiric administration of broad-spectrum intravenous antibiotics

Answer

Early operative internal fixation of the femur fracture
The correct intervention is early operative internal fixation. This patient is experiencing Fat Embolism Syndrome (FES), characterized by the classic triad of respiratory distress, neurological changes, and a petechial rash occurring 24 to 72 hours after a major long bone (femur) fracture. The pathophysiology involves marrow fat droplets entering the venous circulation due to increased intramedullary pressure and tearing of venules at the fracture site. Early operative stabilization (e.g., open reduction and internal fixation) is the most proven method to reduce the incidence of FES because it eliminates ongoing fracture mobility and minimizes further marrow fat release.

Step-by-Step Solution

1
Analyze the clinical presentation to establish a diagnosis.
The patient exhibits the classic triad of hypoxemia, neurological abnormalities (confusion and agitation), and a petechial rash 24 to 48 hours after a long bone fracture, confirming Fat Embolism Syndrome (FES).
Accurate identification of the complication is necessary to determine what prophylactic measure was missed.
2
Identify the underlying pathophysiology of the diagnosed condition.
FES is caused by the release of fat droplets from the bone marrow into the systemic venous circulation, leading to microvascular occlusion and inflammation.
Understanding the mechanism highlights how the condition could have been prevented.
3
Determine the most effective preventative intervention.
Early operative stabilization of the fracture minimizes bone movement and marrow pressure, preventing further fat embolization.
This establishes early internal fixation as the correct preventative measure.

Key Concept

Fat Embolism Syndrome (FES) presents with a triad of respiratory distress, neurological dysfunction, and a petechial rash following long bone fractures. Early operative stabilization of the fracture is the most effective method for prevention.
Estimated Time:1m 15s
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Orthopedic Surgery

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