Most commonly occurs from stabbings and gunshot wounds as a result of interpersonal violence. In New Zealand, gunshot wounds are relatively rare – the majority of penetrating chest trauma is from stabbings.
Pneumothorax – the most common serious injury from penetrating chest trauma. If there is an open connection between the environment and thoracic cavity, an open pneumothorax (aka sucking chest wound) can develop where air can become preferentially entrained into the pleural space, causing ipsilateral lung collapse. If air can enter the thoracic cavity but is prevented from exiting (by tissue valve effect) a tension pneumothorax can rapidly develop
Due to its position, the right ventricle is the most commonly lacerated area of the heart. While any penetrating injury to the thorax could cause a cardiac injury, be particularly mindful of stab wounds to “the box” – bound anteriorly by the clavicles, bilaterally by the mid clavicular line, inferiorly by the costal margins.
A long knife or a GSW/missile could cause a cardiac injury from a more lateral anterior or posterior entry wound.
Less common in penetrating thoracic trauma
Diagnosis is confirmed with bronchoscopy
Can be challenging to diagnose but have high mortality rates if untreated.
Symptoms and signs include – haematemesis, cervical or mediastinal air seen on CXR or CT, a left sided pleural effusion (+/- particulate matter draining from tube thoracostomy)
Definitive diagnosis is made by contrast studies or oesophagoscopy
Consider if the patient has been stabbed in the lower chest (or if a bullet may have traversed the diaphragm). These injuries can be very challenging to diagnose – CT scan is only around 82-87% sensitive in detecting diaphragm laceration in penetrating trauma. If this is strongly suspected, direct operative visualisation by laparoscopy or VATS is indicated.
If the patient is haemodynamically stable, a CXR should be performed. Injuries such as a pneumothorax may not manifest on early imaging. A repeat CXR should be performed at 6h.
Stable patients with injuries that potentially traverse the mediastinum or diaphragm should be considered for CT scanning.
As the trajectory of a gun shot wound or missile can be unpredictable, most patients with injuries as the result of this mechanism should have a CT scan.
Note that a “normal” CT does not rule out tracheobronchial, oesophageal or diaphragm laceration
For suspect tracheobronchial injuries
For suspected oesophageal injuries
Laparoscopy or Video Assisted Thoracic Surgery (VATS)
For suspected diaphragm lacerations
Asymptomatic patients with normal vital signs that have a normal initial and 6h CXR (and no concerns about mediastinal, diaphragm, intraabdominal or vascular injuries) can be discharged from ED with advice to return if increasing shortness of breath or other concerns.
penetrating chest injury unstable
penetrating chest stable