Flail chest

A serious injury involving multiple rib fractures

Flail chest is a serious medical condition that occurs when a segment of the rib cage breaks due to trauma and becomes detached from the rest of the chest wall. This condition is characterized by the paradoxical movement of the affected segment during respiration, which can severely impair breathing and lead to respiratory failure.

Pathophysiology

Flail chest typically results from blunt trauma to the thorax, such as that sustained in a motor vehicle accident or a fall from a significant height. The injury involves multiple consecutive rib fractures, usually in two or more places per rib, creating a "floating" segment of the chest wall. This segment moves in the opposite direction to the rest of the chest during breathing: it sinks in during inspiration and bulges out during expiration, a phenomenon known as paradoxical breathing.

File:Flail chest diagram.png

Diagram illustrating the paradoxical movement of a flail segment during respiration.

The paradoxical movement of the flail segment impairs the mechanics of breathing, reducing the efficiency of ventilation and leading to inadequate oxygenation of the blood. This can result in hypoxia and respiratory distress. Additionally, the instability of the chest wall can cause further injury to the underlying lungs, potentially leading to pulmonary contusion or pneumothorax.

Clinical Presentation

Patients with flail chest typically present with severe chest pain, difficulty breathing, and visible deformity of the chest wall. The paradoxical movement of the flail segment is often apparent on physical examination. Other signs may include:

• Tachypnea (rapid breathing)
• Cyanosis (bluish discoloration of the skin due to lack of oxygen)
• Crepitus (a crackling sound or sensation under the skin)

Diagnosis

The diagnosis of flail chest is primarily clinical, based on the characteristic signs and symptoms. However, imaging studies such as chest X-ray or CT scan are often used to confirm the diagnosis and assess the extent of the injury. These imaging modalities can reveal the number and location of rib fractures and any associated injuries to the lungs or other structures.

Management

The management of flail chest focuses on stabilizing the patient, ensuring adequate oxygenation, and addressing any associated injuries. Treatment options may include:

• Oxygen therapy: To improve oxygenation and relieve hypoxia.
• Pain management: Adequate pain control is essential to allow effective breathing and coughing. This may involve the use of analgesics or nerve blocks.
• Mechanical ventilation: In severe cases, intubation and mechanical ventilation may be necessary to support breathing and stabilize the chest wall.
• Surgical intervention: In some cases, surgical fixation of the rib fractures may be performed to stabilize the chest wall and improve respiratory function.

Prognosis

The prognosis for patients with flail chest depends on the severity of the injury and the presence of any associated complications. With appropriate management, many patients recover fully, although some may experience long-term respiratory issues or chronic pain.

Related pages

• Rib fracture
• Pulmonary contusion
• Pneumothorax
• Respiratory failure