Pneumothorax – Causes, Symptoms and Treatment
A pneumothorax occurs when air enters the pleural space, causing partial or complete collapse of a lung. It can arise spontaneously or result from injury.
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A pneumothorax occurs when air enters the pleural space, causing partial or complete collapse of a lung. It can arise spontaneously or result from injury.
What is a Pneumothorax?
A pneumothorax occurs when air enters the pleural space – the thin gap between the lung and the chest wall. Under normal conditions, a slight negative pressure in this space keeps the lung fully expanded. When air enters the pleural space, this pressure is disrupted and the lung partially or fully collapses, a condition also referred to as a collapsed lung.
Causes
Pneumothorax is classified into several types based on the underlying cause:
- Primary spontaneous pneumothorax: Occurs without an obvious cause, most commonly in tall, thin, young men. It is typically caused by the rupture of small air-filled blisters (blebs or bullae) on the surface of the lung.
- Secondary spontaneous pneumothorax: Develops as a complication of an existing lung disease such as COPD, asthma, cystic fibrosis, or pneumonia.
- Traumatic pneumothorax: Results from chest injury such as rib fractures, stab wounds, gunshot wounds, or as a complication of a medical procedure (iatrogenic pneumothorax).
- Tension pneumothorax: A life-threatening form in which air continuously enters the pleural space but cannot escape, building up pressure that shifts the heart and major blood vessels.
Symptoms
Symptoms vary depending on the size and type of pneumothorax:
- Sudden, sharp chest pain, typically on one side
- Shortness of breath (dyspnea), worsening with activity
- Rapid, shallow breathing
- Dry cough
- Pale or bluish discoloration of skin and lips (cyanosis) in severe cases
- In tension pneumothorax: severe drop in blood pressure, rapid heart rate, and loss of consciousness
Diagnosis
Diagnosis is based on clinical examination and imaging studies:
- Physical examination: Reduced or absent breath sounds on the affected side when listening with a stethoscope (auscultation).
- Chest X-ray: The standard diagnostic tool; reveals the presence of air in the pleural space and the extent of lung collapse.
- CT scan (computed tomography): Used for complex cases or surgical planning; provides more detailed images of the chest.
- Ultrasound: A rapid bedside tool used in emergency settings to confirm or exclude pneumothorax.
Treatment
Treatment depends on the size of the pneumothorax and the clinical condition of the patient:
- Observation and supplemental oxygen: Small, stable pneumothoraces may be managed conservatively; oxygen therapy accelerates absorption of the trapped air.
- Needle aspiration: A needle is used to remove air from the pleural space – typically for moderate-sized pneumothoraces.
- Chest tube drainage (thoracostomy): A thin tube (drain) is inserted into the pleural space to continuously drain air. The tube is connected to a water-seal or suction device.
- Surgery (thoracoscopy / VATS): Recommended for recurrent pneumothorax or when conservative measures fail. The procedure involves removing blebs and fusing the pleural layers together (pleurodesis).
- Emergency decompression: In tension pneumothorax, immediate needle decompression at the 2nd intercostal space (midclavicular line) is performed to relieve life-threatening pressure.
Prognosis and Outlook
Primary spontaneous pneumothorax generally resolves well with appropriate treatment. However, the recurrence rate can be as high as 50% within the first two years. Surgical treatment, particularly pleurodesis, significantly reduces the risk of recurrence. Secondary and tension pneumothorax carry a higher risk and require prompt medical intervention to prevent serious complications.
References
- MacDuff A, Arnold A, Harvey J. Management of spontaneous pneumothorax: British Thoracic Society Pleural Disease Guideline 2010. Thorax. 2010;65(Suppl 2):ii18-ii31.
- Tschopp JM, et al. ERS task force statement: diagnosis and treatment of primary spontaneous pneumothorax. European Respiratory Journal. 2015;46(2):321-335.
- Roberts DJ, et al. Clinical presentation and management of tension pneumothorax: a systematic review. Annals of Surgery. 2015;261(6):1082-1096.
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Related search terms: Pneumothorax + Pneumothoraces