Tracheobronchial Injury: The Air Leak That Won't Quit and the Airway You Can't Assume Is Safe

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Updated July 2026  |  More ICU clinical guides →

Tracheobronchial injury — a tear in the trachea or a mainstem bronchus — is rare, but when it is present it changes everything about how the airway is managed, and it is easy to miss until the clues pile up. The signature is air escaping where it shouldn't: a pneumothorax that keeps leaking despite a well-placed chest tube on suction, subcutaneous emphysema that spreads across the chest and neck and face, and air tracking into the mediastinum. For the ICU nurse the two things that matter most are recognizing that pattern early and understanding why a routine intubation or a positive-pressure breath can turn a survivable tear into a crisis. This guide covers the mechanism, the recognition pattern, bronchoscopy, and airway management.

How the airway tears

Most tracheobronchial injuries come from blunt trauma — a high-energy chest impact, a rapid deceleration, or a crush that compresses the airway against a closed glottis and bursts it, much like a paper bag popped when squeezed. The most common location is within a couple of centimeters of the carina, often the proximal right mainstem bronchus. Penetrating trauma (stab, gunshot) and, less commonly, iatrogenic injury from intubation or a difficult airway can also tear the airway. The tear can be partial or complete; a completely transected bronchus can retract, and the injured segment of lung may collapse. Because the airway is a low-pressure conduit that suddenly communicates with the pleura and soft tissues, the clinical picture is dominated by where the air goes, not by bleeding.

The recognition pattern

No single sign is specific, but the constellation is. Suspect a tracheobronchial injury when you see several of these together in a chest-trauma patient:

The most useful red flag at the bedside is the pneumothorax that behaves wrong. An ordinary traumatic pneumothorax should re-expand and stop leaking after a chest tube goes on suction. When the leak is large and persistent — the lung stays down, the air leak keeps bubbling, and adding a second chest tube doesn't fix it — think about an airway tear feeding the pleural space directly.

Confirming it: bronchoscopy

The definitive diagnostic test is flexible bronchoscopy, which lets the team directly visualize the tear, define its location and extent, and plan management. CT can suggest the injury (air patterns, an abnormal airway contour, the fallen-lung sign), but bronchoscopy is what confirms and characterizes it — and it is often done in the same setting as securing the airway, because the bronchoscope can guide tube placement past or across the injury. The nurse's role around bronchoscopy is standard but time-critical: set up the scope and suction, monitor sedation and oxygenation during the procedure, and have airway rescue equipment ready because these are, by definition, difficult airways.

Airway management and repair

Securing the airway is the crux, and it is dangerous precisely because a blind intubation can extend the tear or place the tube tip into the injured segment. When possible, intubation is done over or alongside a bronchoscope so the tube can be positioned to bridge the tear or, for a mainstem injury, advanced into the uninjured bronchus (sometimes with selective single-lung ventilation) to isolate the leak. Chest tubes manage the pneumothorax but will not seal the source. Definitive treatment depends on the injury: small, stable tears in a patient who is ventilating adequately can sometimes be managed conservatively (careful airway positioning, low airway pressures, observation), while larger tears, complete transections, or injuries that can't be ventilated around require surgical repair. Throughout, the nurse keeps airway pressures as low as safely possible, watches the trend of the subcutaneous air and the chest-tube leak as a barometer of whether things are improving or worsening, and stays ready for a difficult re-intubation.

Where to go from here

Pair this with the tension pneumothorax guide and the traumatic hemothorax guide for the rest of the chest-trauma picture, the flail chest and pulmonary contusion guide for the injured lung, and the difficult airway guide for the airway rescue mindset these patients demand.