Diaphragmatic Rupture
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Direct answer
Bowel loops, a coiled nasogastric tube or an apparently elevated hemidiaphragm on a chest radiograph after blunt abdominal trauma means a torn diaphragm until CT disproves it. Deceleration injuries from road traffic accidents — the dominant Indian scenario — burst the posterolateral left hemidiaphragm in most patients, because the liver buffers the right side; right-sided and bilateral ruptures are rarer and carry worse outcomes. The danger is two-fold in the acute phase: respiratory compromise from a compressed lung and mediastinal shift, and strangulation of herniated viscera when diagnosis slips into the latent period. Repair is surgical, via laparotomy in the acute setting (allowing full abdominal assessment) and thoracotomy for chronic, well-walled hernias.
What you must remember
- Side prediction: roughly two-thirds to three-quarters of blunt ruptures are left-sided; the liver protects the right, and right-sided tears are diagnosed later because of that same camouflage.
- Mechanism: sudden intra-abdominal pressure spike from seat-belt or steering impact tears the posterolateral diaphragm, the developmental weak point (where Bochdalek defects also occur).
- Radiograph clues: elevated or obscured hemidiaphragm, bowel gas above the diaphragm, mediastinal shift, and the pathognomonic nasogastric tube curling within the chest.
- Best imaging: contrast-enhanced CT of chest and abdomen in stable patients; sensitivity is high but not absolute, so a negative scan never overrides strong suspicion.
- Associated injuries: splenic and hepatic lacerations, pelvic fractures and head injury frequently coexist — screen systematically rather than anchoring on the chest film.
- Repair principles: primary closure with non-absorbable interrupted sutures; prosthetic patch for large defects or chronic attenuation; associate laparotomy in the acute phase, thoracotomy for chronic hernias.
- Latent-phase threat: a missed tear herniates omentum and stomach over months; sudden obstruction or strangulation years later is the notorious delayed presentation.
A typical exam case
A 30-year-old two-wheeler rider arrives after a head-on collision, breathless with reduced left-sided breath sounds and dullness alternating with hyper-resonance. The portable film shows stomach gas in the left chest, and the nasogastric tube, inserted for decompression, follows the stomach into the thorax — the single most quotable radiograph in trauma viva. He is stabilised, a chest tube is avoided in the zone of herniated viscera until imaging defines anatomy, and CT confirms a 8 cm left posterolateral tear with the stomach and colon above the diaphragm. At laparotomy the viscera are reduced, the edges freshened and the tear closed with interrupted non-absorbable sutures; the spleen, inspected for injury, is intact. Had he presented a year later with chest pain after a heavy meal and a chest film showing a gas-filled viscus, the same diagnosis would be made in the latent phase and repaired through the chest, where adhesions and a sac are better dealt with.
How the FMGE frames it
Examiners habitually test the mimics: a gastric fundus distended with air looks like an elevated diaphragm, and a diaphragmatic rupture looks like a haemothorax or lung contusion on a poor film — the nasogastric tube question is their tiebreaker. The second recurring theme is side: the stem will describe right-sided chest injury with a "elevated right diaphragm" and expect you to know right ruptures are less common, later-presenting and often injuries of greater force. Finally, remember tension gastrothorax — a herniated, distending stomach that mimics tension pneumothorax; needle decompression will not help, but a nasogastric tube can be life-saving.
Frequently asked questions
Why are most blunt diaphragmatic ruptures left-sided?
The liver absorbs and disperses the pressure wave on the right, so the unprotected left posterolateral diaphragm tears in about two-thirds to three-quarters of cases.
Which radiograph sign is virtually diagnostic?
A nasogastric tube that stops at the oesophageal hiatus and coils within the chest, proving the stomach lies above the diaphragm.
Which approach is used for acute repair?
Laparotomy in the acute trauma setting, because it permits reduction, repair and full screening for associated abdominal injuries; thoracotomy suits chronic hernias.
What is the latent phase of diaphragmatic rupture?
A delayed interval of months to years in which herniated viscera obstruct or strangulate, often after an apparently trivial strain or large meal.
What is tension gastrothorax?
Massive gastric distension within the chest through a diaphragmatic tear, causing shock and mimicking tension pneumothorax; urgent nasogastric decompression precedes definitive repair.