Thursday, June 21, 2018

BAI

Q: 24 year old male is brought to ED after motor vehicle accident (MVA). Initial CXR showed following features:

  • Left "apical cap" 
  • Deviation of nasogastric (NG) tube rightward 
  • Deviation of trachea rightward 
  • Deviation of right mainstem bronchus downward 
  • Wide left paravertebral stripe
Your major concern?


Answer:  Blunt aortic injury (BAI)

BAI is a trauma emergency. Initial bedside CXR is a great way to look for signs of BAI. Following features on CXR warrants emergent intervention or CT chest if clinical stability permits.

  • Wide mediastinum (8 cm if supine or 6 cm if upright)
  • Obscured aortic knob
  • Abnormal aortic contour 
  • Pleural blood above the apex of left lung (known as apical cap) 
  • Signs of left hemothorax 
  • Deviation of NG tube rightward 
  • Deviation of trachea rightward 
  • Deviation of right mainstem bronchus downward 
  • Wide left paravertebral stripe

#trauma


References: 

1. Ho ML, Gutierrez FR. Chest radiography in thoracic polytrauma. AJR Am J Roentgenol 2009; 192:599. 

2. Marnocha KE, Maglinte DD, Woods J, et al. Blunt chest trauma and suspected aortic rupture: reliability of chest radiograph findings. Ann Emerg Med 1985; 14:644. 

3. Ekeh AP, Peterson W, Woods RJ, et al. Is chest x-ray an adequate screening tool for the diagnosis of blunt thoracic aortic injury? J Trauma 2008; 65:1088. 


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