Question:
A 12-year-old child is admitted to the ICU with blunt trauma and a femur fracture. PaO2 stays at 60 mmHg despite 100% oxygen via a non-rebreather mask, the chest X-ray shows clear lung fields, but the patient remains confused. What is the most likely diagnosis?
A 12-year-old child is admitted to the ICU with blunt trauma and a femur fracture. PaO2 stays at 60 mmHg despite 100% oxygen via a non-rebreather mask, the chest X-ray shows clear lung fields, but the patient remains confused. What is the most likely diagnosis?
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Long-bone fracture, hypoxia and confusion with a clear CXR points where?
Updated On: Jun 23, 2026
- Pulmonary contusion
- Fat embolism syndrome
- Hypovolaemic shock
- Pulmonary embolism
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The Correct Option is B
Solution and Explanation
Answer: Fat embolism syndrome.
Step 1: The setting is a long-bone (femur) fracture with two organ systems hit: the lungs (hypoxia, PaO2 60 mmHg despite 100% oxygen) and the brain (confusion). This combination after a long-bone fracture points to fat embolism syndrome (FES).
Step 2: Fat globules released from the marrow lodge in capillary beds, causing direct tissue injury and a systemic inflammatory response. This produces the classic triad: respiratory failure, neurological changes and a petechial rash. Onset is typically 24 to 72 hours after the fracture.
Step 3: A clear chest X-ray with severe refractory hypoxia argues against pulmonary contusion, which would show lung opacities, and against the volume-loss picture of hypovolaemic shock. Pulmonary embolism (thrombotic) is far less likely in a child right after a fracture and does not explain the marrow-fat origin and CNS picture as well.
Step 4: Hypoxia plus confusion after a femur fracture equals fat embolism syndrome. Ref: Bailey and Love / Schwartz Principles of Surgery.
Step 1: The setting is a long-bone (femur) fracture with two organ systems hit: the lungs (hypoxia, PaO2 60 mmHg despite 100% oxygen) and the brain (confusion). This combination after a long-bone fracture points to fat embolism syndrome (FES).
Step 2: Fat globules released from the marrow lodge in capillary beds, causing direct tissue injury and a systemic inflammatory response. This produces the classic triad: respiratory failure, neurological changes and a petechial rash. Onset is typically 24 to 72 hours after the fracture.
Step 3: A clear chest X-ray with severe refractory hypoxia argues against pulmonary contusion, which would show lung opacities, and against the volume-loss picture of hypovolaemic shock. Pulmonary embolism (thrombotic) is far less likely in a child right after a fracture and does not explain the marrow-fat origin and CNS picture as well.
Step 4: Hypoxia plus confusion after a femur fracture equals fat embolism syndrome. Ref: Bailey and Love / Schwartz Principles of Surgery.
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