Which finding is characteristic of a flail chest?

Which finding is characteristic of a flail chest?

• A. Cyanosis
• B. Floating chest wall segment
• C. Adequate chest expansion
• D. No dyspnea

Answer: (B)

Flail chest is defined by a floating chest wall segment that becomes detached from the rest of the chest due to fractures in two or more adjacent ribs at multiple sites. This segment moves independently and paradoxically during breathing: it will move inward with inspiration and outward with expiration, opposite to the normal chest wall. This instability reduces ventilation to the affected lung, often causing significant dyspnea and hypoxemia. Other options aren’t specific to flail chest—cyanosis can occur with many conditions, chest expansion is typically compromised, and dyspnea is usually present—making the floating chest wall segment the characteristic finding.

Flail chest is defined by a floating chest wall segment that becomes detached from the rest of the chest due to fractures in two or more adjacent ribs at multiple sites. This segment moves independently and paradoxically during breathing: it will move inward with inspiration and outward with expiration, opposite to the normal chest wall. This instability reduces ventilation to the affected lung, often causing significant dyspnea and hypoxemia. Other options aren’t specific to flail chest—cyanosis can occur with many conditions, chest expansion is typically compromised, and dyspnea is usually present—making the floating chest wall segment the characteristic finding.