Emergency Management of Tension Pneumothorax in Chest Trauma

Diagnosis and Clinical Recognition

Tension pneumothorax is the most immediately life‑threatening cause of sudden breathlessness after chest injury and must be diagnosed clinically and treated emergently without waiting for radiographic confirmation. 1
Pathophysiology: progressive air accumulation in the pleural space with a one‑way valve mechanism leads to impaired venous return and cardiovascular collapse. 1
Key bedside signs include rapid labored respiration, progressive respiratory distress, cyanosis, profuse sweating, tachycardia, attenuated or absent breath sounds on the affected side, elevated chest wall, subcutaneous emphysema, jugular venous distension, and hypotension with tachycardia. Tracheal deviation is unreliable and was absent in all 111 cases of a trauma database review. 1
Tension can develop from small pneumothoraces; the initial size does not predict progression to tension physiology. 1
Cardiac tamponade may mimic shock but presents with distended neck veins, muffled heart sounds, and hypotension without tracheal deviation or unilateral lung findings. 1

Immediate assessment of airway patency and respiratory effort is required; high‑flow oxygen should be applied if oxygen saturation is below target. Pulse oximetry, pulse rate, and respiratory rate must be measured. 5

When clinical suspicion for tension pneumothorax exists, decompression must be performed without delay for imaging. 1

Use a 7–8 cm needle (minimum 7 cm) inserted at the second intercostal space, mid‑clavicular line. 1, 2
Traditional 5 cm needles fail in 32.84 % of cases because chest‑wall thickness exceeds 3 cm in 57 % of patients; therefore, needles shorter than 7 cm should never be used. 1

After needle decompression, place a tube thoracostomy at the fourth‑fifth intercostal space, mid‑axillary line, connect to an underwater‑seal drainage system, and confirm bubbling before removing the needle. 1, 2
Never clamp a bubbling chest drain, as this can precipitate fatal tension pneumothorax. 4

An open chest wound creates a direct communication between the external environment and the pleural space. The wound should be left exposed to ambient air and covered with a clean non‑occlusive dry dressing or a vented chest seal. Continuous monitoring of breathing is essential; the dressing should be loosened or removed if respiratory status deteriorates. Improper occlusive dressings can generate iatrogenic tension pneumothorax. 2, 1

Any pneumothorax in a mechanically ventilated patient mandates tube thoracostomy because positive‑pressure ventilation maintains the air leak. Sudden deterioration or pulseless electrical activity arrest should prompt immediate consideration of tension pneumothorax. 4, 1

Approximately 32 % of patients require a subsequent intervention after the initial needle decompression; repeat needle decompression or conversion to tube thoracostomy should be performed if tension physiology recurs. 1

Do not delay needle decompression for chest‑X‑ray confirmation. 1
Do not use needles shorter than 7 cm for decompression. 1
Do not rely on tracheal deviation as a diagnostic criterion. 1
Do not clamp a bubbling chest tube. 4
Do not apply fully occlusive dressings to open chest wounds without continuous monitoring. 1, 2