A patient develops tachypnea, petechial rash, and shortness of breath after sustaining a long bone fracture. Which of the following is the most likely diagnosis?

1. A

   Disseminated intravascular coagulation (DIC)

2. B

   Pulmonary embolism

3. C

   Pneumothorax

4. D

   Fat embolism syndrome

Appeared in: AIIMS M.Sc. Nsg Entrance exam-2026

Explanation

• The patient's symptoms of tachypnea, shortness of breath, and a petechial rash after a long bone fracture constitute the classic presentation of Fat Embolism Syndrome (FES).
• FES occurs when fat globules from the fractured bone's marrow enter the bloodstream.
• These emboli travel to and occlude microvasculature in the lungs (causing respiratory distress) and skin (causing a petechial rash).
• The petechial rash, typically found on the chest, neck, and axillae, is a hallmark diagnostic sign of FES.

Why Other Options Were Wrong

• Option A: Disseminated intravascular coagulation (DIC) is a condition of widespread clotting and bleeding. While it can cause petechiae, it does not typically present with the acute respiratory failure seen in this specific context of a long bone fracture.
• Option B: A pulmonary embolism (PE) is typically a thromboembolism (blood clot), not a fat embolus. While it causes tachypnea and shortness of breath, it does not cause a petechial rash.
• Option C: A pneumothorax is a collapsed lung. It causes sudden shortness of breath and chest pain but is a mechanical lung issue and does not cause systemic symptoms like a petechial rash.

Related Visual

• Visual 1: Diagram - Illustrating the pathophysiology of Fat Embolism Syndrome, showing fat globules traveling from a fractured femur to occlude capillaries in the lungs, brain, and skin.
• Visual 2: Photograph - A close-up image of a petechial rash on the chest and axilla of a patient with FES, highlighting the characteristic non-blanching, pinpoint red spots.

Clinical Relevance

• Nursing practice connection: Safe nursing care depends on performing Diagnosis of Fat Embolism Syndrome (FES) following long bone fracture in the correct sequence, documenting the action clearly, and monitoring for the expected response.
• The highest priority nursing action for a patient at risk for FES is prevention through early and effective immobilization of long bone fractures.
• Nurses must perform vigilant monitoring of respiratory status (SaO2, respiratory rate), neurological function (level of consciousness), and skin for any signs of a petechial rash in any patient with a long bone fracture, especially within the first 72 hours.
• Care is primarily supportive, focusing on maintaining oxygenation. The nurse should be prepared for the potential need for high-flow oxygen or mechanical ventilation.

How to Approach the Question

• First, identify the key elements in the clinical scenario: a specific precipitating event (long bone fracture) and a cluster of subsequent symptoms (tachypnea, shortness of breath, petechial rash).
• Recognize that this combination of a specific cause and a unique set of symptoms points towards a classic clinical syndrome.
• Evaluate each option against this pattern. Fat Embolism Syndrome is defined by this exact triad (respiratory distress, neurological changes, petechial rash) following long bone fractures.
• Systematically eliminate the other options by identifying their key missing features or different typical presentations.
• For example, a standard pulmonary embolism causes respiratory distress but not a rash. A pneumothorax is a localized lung issue. DIC is a systemic bleeding/clotting disorder with a different primary presentation.

Concept Tested & Keywords

• Concept Tested: Diagnosis of Fat Embolism Syndrome (FES) following long bone fracture.
• Stem keywords: tachypnea, petechial rash, shortness of breath, long bone fracture
• Lead-in keywords: most likely diagnosis
• Clinical cues: The combination of a long bone fracture with respiratory and dermatological signs is a classic pattern.

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QHvTmL0aaaol5EcbJEgqTF

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