What are the pathological characteristics of tension pneumothorax?

Tension pneumothorax is a severe thoracic injury that, if not promptly treated, can lead to serious impairment of lung function and may be life-threatening. Its pathophysiological characteristics include separation of the lung from the chest wall, increased intrapulmonary pressure, and cardiovascular changes. A detailed analysis is as follows:

1. Lung Surface Separation

Tension pneumothorax occurs when injury to the pleura allows air to enter the pleural cavity, causing the lung to separate from the chest wall. This prevents normal lung expansion and contraction, and the condition progressively worsens over time.

2. Increased Lung Pressure

As air accumulates in the pleural cavity, pressure within the lung continues to rise. This compresses and collapses alveoli, restricts normal elastic recoil of the lungs, and severely impairs pulmonary function and gas exchange.

3. Cardiovascular Changes

The elevated intrathoracic pressure in tension pneumothorax compresses the heart adjacent to the pleura, impairing cardiac filling and function. Cardiac compression may result in prolonged systole, bradycardia, hypotension, and other hemodynamic disturbances.

In addition, patients may develop increased pulmonary arterial pressure and elevated cardiac preload. Therefore, when tension pneumothorax occurs, immediate medical treatment at a hospital is essential, including prompt surgical intervention to ensure patient survival. Furthermore, appropriate prevention and management of associated chest injuries are necessary to reduce the risk of developing tension pneumothorax.