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free120/Block 1/Question#31

A 16-year-old boy is admitted to the emergency ...

Hemopneumothorax, not under tension

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Air and fluid = hydropneumothorax. If that fluid is blood (s/p stabbing), it’s a hemopneumothorax. Lack of mediastinal shift indicates that it’s not under tension.

d_holles  @benwhite_dotcom how can it not be under tension if air is entering the pleural cavity? +1  
nwinkelmann  Because the stab wound isn't functioning like a flap, meaning the air can escape. The reason a tension pneumothorax occurs is because the wound acts as a flap, where on inspiration it is open and air enters, but on expiration is closes and traps the air. +2