Identification of Tension Pneumothorax

Executive Summary

Tension pneumothorax (TPT) is a life-threatening condition occurring in approximately 1% to 3% of prehospital major trauma and intensive care patients. While traditionally taught as a uniform clinical entity characterized by "classic" signs such as tracheal deviation and jugular venous distention (JVD), evidence indicates that these manifestations are rare and unreliable. The clinical presentation of TPT is fundamentally dictated by the patient’s ventilatory status. Patients breathing unassisted typically undergo a progressive respiratory deterioration, while those receiving assisted ventilation (positive pressure) face rapid, sudden cardiovascular collapse. Emergency decompression must be prioritized based on these distinct physiological trajectories, often before radiological confirmation in ventilated or unstable patients.

Indications for Emergency Decompression

Emergency thoracic decompression is indicated when a patient presents with significant respiratory or hemodynamic compromise that is suspected to be secondary to an expanding pneumothorax.

Immediate Decompression (Without Radiography)

Decompression should be performed immediately, without waiting for a chest X-ray (CXR), in the following scenarios:

• Ventilated Patients: Any sudden, unexplained deterioration in oxygen saturation (SpO2) followed by hypotension or a marked decrease in cardiac output.
• Unstable Unassisted Patients: If a CXR is not immediately available and the patient exhibits:

Deferred Decompression

In stable, unassisted patients not in extremis, it is appropriate to obtain a CXR or perform thoracic ultrasonography to confirm the diagnosis and lateralize the disease before intervention.Tension pneumothorax—time for a re-think?S Leigh-Smith, T Harris. Emerg Med J 2005;22:8–16. doi: 10.1136/emj.2003.010421

Clinical Presentation of Patients With Tension Pneumothorax A Systematic Review. Roberts et al., 2014