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 pulmonary contusion  



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Author5 Posts
  #1

Why is there ''white out'' of lungs in chest x-ray in pulmonary contusion???




  #2

Pulmonary contusion is an injury to lung parenchyma, leading to oedema and blood collecting in alveolar spaces and loss of normal lung structure & function. This blunt lung injury develops over the course of 24 hours, leading to poor gas exchange, increased pulmonary vascular resistance and decreased lung compliance. There is also a significant inflammatory reaction to blood components in the lung, and 50-60% of patients with significant pulmonary contusions will develop bilateral Acute Respiratory Distress Syndrome (ARDS).

you have white out in ARDS



  #3

good answer msyamp. also since alveoli are not filled with air leading to 'consolidation' and the whiting out on xray. remember air in the lung is responsible for the normal 'black' or luscency of the lungs on xray


  #4

thanks. But in pneumonia and ARDS we also have fluid in alveoli but not white out in x-ray. but infiltrates instead. So...


  #5

maybe i do not understand what you mean by 'white out'.

there is HOMOGENOUS opacification from fluid in the pleural spaces and also from extensive consolidation in lobar pneumonia.

PATCHY and or STREAKY opacification is seen in lobular (broncho) pneumonia, ARDS and generally speaking all the other conditions.

the basic mechanism is lack of air in the alveoli.






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