Recognize signs of fat embolism syndrome.

• A. Hypoxemia, mental status changes, petechial rash
• B. Hypoglycemia, tachycardia
• C. Hyperkalemia, muscle weakness
• D. Jaundice, pruritus

Answer: (A)

Recognizing fat embolism syndrome centers on the triad of hypoxemia, mental status changes, and a petechial rash following a traumatic event like a long-bone fracture. Fat droplets from the bone marrow enter the circulation and lodge in small vessels of the lungs (causing low oxygen), in the brain (causing changes in consciousness or behavior), and in the skin (producing petechiae, often on the chest, neck, and axilla). This pattern typically appears about 24–72 hours after injury, which makes these signs the best fit for fat embolism syndrome. Other options show signs that don’t reflect this specific pattern of fat emboli affecting lung, brain, and skin, so they don’t align with this condition. If suspected, prioritize supportive care with ensuring adequate oxygenation, monitoring, and early fracture stabilization to reduce further fat release.