Tension gastrothorax

Tension gastrothorax describes a rare life-threatening condition caused by mediastinal shift due to a distended stomach herniating into the thorax through a diaphragmatic defect. 

Presentation is generally with acute and severe respiratory failure, with clinical features such as dyspnoea, chest pain, and tachycardia being common 1-5. Case reports commonly detail clinical progression into shock and cardiac arrest 1,3.

Tension gastrothorax requires a left-sided diaphragmatic defect to exist, and thus occurs in two different patient populations:

The pathophysiology is thought to be due to an instance of significantly increased intra-abdominal pressure (e.g. blunt trauma, Valsalva manoeuvre, pregnancy) which results in herniation of the stomach through the left-sided diaphragmatic defect into the thorax 1,2,8. The exact mechanism of how or when this herniated stomach becomes rapidly filled with air is unclear, but potentially an abnormally positioned gastro-oesophageal junction that prevents belching may be the trigger for the formation of a one-way valve and therefore resultant tension gastrothorax 1,2.

Similarly to a tension pneumothorax, this air collection can grow and expand until it exerts a positive mass effect on the mediastinum, eventually resulting in respiratory and cardiac arrest 1,2.

Chest radiographs demonstrate a large air-filled lucent structure in the left hemithorax causing contralateral mediastinal shift 1-8. In differentiating it from a tension pneumothorax, the following are useful:

  • the left hemidiaphragm is poorly defined 1,2
  • there may be a fluid level in the left hemithorax 1,2
  • lack of a gastric bubble 2

These cross-sectional modalities will allow the best visualisation of the tension gastrothorax, but are rarely available in an emergency situation 4.

Prompt management with nasogastric tube insertion to decompress the stomach is necessary to prevent further clinical deterioration 4,5. The patient’s diaphragmatic defect should then be surgically repaired once stable 4,5

The term 'gastrothorax' was first used in the literature by American emergency physician Gary Ordog and his colleagues in 1984 in the context of a tension gastrothorax occurring after trauma 9.

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rID: 54924
Tag: cases
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