Tension Pneumothorax: Symptoms, Causes, Diagnosis, and Emergency Treatment

What Is Tension Pneumothorax?

Tension pneumothorax is a life-threatening medical emergency. It happens when air enters the space between the lung and chest wall (pleural space) and cannot escape. The trapped air continues to build up with each breath, putting increasing pressure on the heart and great blood vessels. Without immediate treatment, it can be fatal within minutes.

Causes

• Trauma — stab wound, gunshot wound, or blunt chest injury (most common cause)
• Mechanical ventilation — positive pressure can cause air leak
• Spontaneous — in tall, thin young men or those with lung disease
• Iatrogenic — following central line insertion, chest drain, or biopsy
• Rib fractures

Symptoms

• Sudden, severe chest pain on one side
• Rapid and increasing difficulty breathing
• Rapid heart rate
• Low blood pressure (in severe cases)
• Distended neck veins
• Trachea deviated to one side
• Decreased or absent breath sounds on affected side
• Anxiety and restlessness
• Cyanosis (bluish lips or skin) — late sign

Diagnosis

Tension pneumothorax is a clinical diagnosis — doctors treat immediately based on symptoms rather than waiting for X-ray. This is because delay can be fatal. In hospital, chest X-ray confirms the diagnosis after initial treatment.

Emergency Treatment

Needle decompression is the first emergency treatment — a large needle is inserted into the chest to release trapped air. This buys time for definitive treatment.

Chest drain (intercostal drain) is then inserted to fully drain the air and allow the lung to re-expand. The patient is continuously monitored in the ICU.

After Treatment

Most patients recover well with prompt treatment. The chest drain typically remains in place for 24–48 hours while the lung re-expands. Underlying causes such as trauma or lung disease are addressed. Follow-up chest X-rays confirm full lung expansion.