Traumatic Diaphragmatic Injury
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Direct answer
Blunt deceleration ruptures the diaphragm on the left side in roughly two-thirds to three-quarters of cases — the liver cushions the right — while penetrating thoracoabdominal wounds create defects of any size that, like all traumatic diaphragmatic injuries, never heal spontaneously. The acute phase threatens associated visceral injury; the delayed phase, months or years later, threatens strangulation of herniated bowel. Acute injuries are repaired through a laparotomy (which also excludes hollow viscus and solid organ damage), whereas chronic delayed hernias are approached through the chest.
What you must remember
- Left-sided preponderance in blunt trauma (about 2:1 or more) because the liver buttresses the right hemidiaphragm; penetrating injuries occur wherever the missile or blade crosses.
- The defect never closes spontaneously: the pleuroperitoneal pressure gradient (abdominal pressure exceeding intrathoracic) progressively sucks viscera into the chest.
- Initial chest radiograph is normal or non-specific in a substantial proportion; suspicion from mechanism matters more than a clean early film.
- Radiological tells: stomach bubble or bowel gas above the diaphragm, coiled nasogastric tube in the left chest, an apparently high or blurred diaphragm, and mediastinal shift.
- Delayed presentation: post-prandial pain, vomiting, breathlessness after a remotely forgotten road accident, with gastric volvulus or strangulated bowel on imaging — the classic "late caller".
- Associated injuries dominate the acute phase: splenic and hepatic injury, rib fractures, pelvic fractures and hollow viscus perforation in blunt trauma.
- Acute repair: laparotomy, gentle reduction of viscera, trimming of ragged edges, primary closure with non-absorbable interrupted sutures; prosthetic mesh for large defects or chronic attenuation.
- Chronic hernia: thoracotomy or thoracoabdominal approach for adhesolysis and repair, occasionally requiring a patch.
- Laparoscopy is both diagnostic and therapeutic in stable penetrating left thoracoabdominal trauma — diaphragmatic injury is frequently missed otherwise.
A delayed case that makes the topic memorable
Eight months after a head-on collision treated at a peripheral centre, a 34-year-old man develops sudden left chest and epigastric pain with vomiting after a heavy meal. The chest radiograph shows multiple air-fluid levels in the left hemithorax with mediastinal shift; a nasogastric tube passes into the chest before it reaches the stomach — the single most quotable sign of diaphragmatic rupture with gastric herniation. A CT scan with multiplanar reformats shows the stomach, omentum and splenic flexure above an interrupted left diaphragmatic shadow, and contrast studies confirm a volved stomach.
Because he is stable and the injury is old, the operation is planned through the left chest: adhesions between viscera and lung are taken down, the stomach and colon are reduced (decompressing the stomach first with a nasogastric tube), the edges of the defect are freshened, and the rent is closed with non-absorbable sutures; a mesh reinforces the repair because chronic dilation has thinned the crura. Had the same defect declared itself on the day of the accident — with a shocked patient and a positive FAST scan — the route would be a midline laparotomy: reduce, repair, and systematically exclude splenic injury and bowel perforation before closing.
Where students slip
The first slip is treating a normal early chest radiograph as reassurance: small ruptures seal themselves with omentum initially and present years later, which is exactly why a "forgotten" mechanism in the history is diagnostic gold. The second is choosing the wrong approach for the wrong phase — answering "thoracotomy" for an acute blunt case misses the intra-abdominal injuries that will kill the patient first, while answering "laparotomy" for a chronic case underestimates the intrathoracic adhesions that make reduction from below hazardous. The viva trap is the congenital differential: Bochdalek hernia is posterolateral and left-sided in infants, Morgagni is anterior and right-sided, and oesophageal hiatus hernia has its own logic — traumatic rupture has no such tidy site preference beyond the left-sided tendency, and sits at the dome or posteriorly.
Frequently asked questions
Why is the left hemidiaphragm ruptured more often in blunt trauma?
The liver absorbs impact forces shielding the right side, and the left hemidiaphragm's posterior weak point gives way — roughly a 2:1 or greater left preponderance.
Do traumatic diaphragmatic defects heal on their own?
No — the constant positive abdominothoracic pressure gradient keeps them open and slowly widens them, making delayed herniation inevitable without surgical repair.
Which radiological sign is characteristic of gastric herniation?
A coiled nasogastric tube passing into the left hemithorax instead of the subdiaphragmatic stomach, often with bowel gas or air-fluid levels above the diaphragm.
Why is laparotomy preferred in acute injuries?
Associated intra-abdominal injuries — splenic and hepatic bleeding, bowel perforation — must be excluded and treated in the same anaesthetic, and visceral reduction is easier from below.
How does a delayed diaphragmatic hernia present?
Post-prandial pain, vomiting and breathlessness months to years after trauma, occasionally as an emergency with gastric volvulus or strangulated bowel in the chest.
What is the role of laparoscopy in suspected injury?
In stable patients with penetrating left thoracoabdominal wounds, diagnostic laparoscopy detects small diaphragmatic lacerations reliably and permits immediate repair — closing a well-known blind spot of non-operative assessment.