Question

A male patient sustains a road traffic accident with closed midshaft fractures of the femur and tibia. Two days later, he develops breathlessness, tachycardia, and petechial rash on the chest and conjunctiva. What is the most probable diagnosis?

• A. Disseminated intravascular coagulation
• B. Fat embolism syndrome
• C. Pulmonary embolism
• D. Sepsis

Hint:

Long bone fracture followed by breathlessness and petechial rash after 24--72 hours = fat embolism syndrome.

Answer 1

The Correct Option is B

Step 1: Understanding the Question:
This question describes the classic clinical triad of Fat Embolism Syndrome (FES) following long bone fractures.
Step 2: Detailed Explanation:

Etiology of FES: FES typically occurs 24 to 72 hours after fractures of the femur, tibia, or pelvis. Fat globules from the bone marrow are released into the systemic circulation.

The Gurd and Wilson Triad: The diagnosis is made clinically based on the presence of:
1. Respiratory insufficiency: Tachypnea and breathlessness due to fat droplets clogging pulmonary capillaries.
2. Neurological symptoms: Confusion or tachycardia (central effects).
3. Petechial rash: This is the most specific sign, usually found on the chest, axilla, neck, and conjunctiva. It is caused by fat globule occlusion of dermal capillaries leading to extravasation.

Differential Diagnosis: Pulmonary embolism usually lacks a petechial rash. Sepsis would present with fever and a clear source of infection. DIC usually involves bleeding from venipuncture sites.

Management: Treatment is primarily supportive (oxygen, hydration). Early stabilization of fractures (e.g., intramedullary nailing) significantly reduces the incidence of FES.

Step 3: Final Answer:
The combination of long bone fractures, respiratory distress, and a petechial rash makes Fat Embolism Syndrome the most probable diagnosis.