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Breathing works because your chest is sealed. It runs at negative pressure. That negative pressure is what pulls air in.
Trauma breaks that in one of a few ways. It can breach the seal — that's an open wound. It can fill the space with something that doesn't belong — air or blood. It can break the frame that moves the chest wall — that's flail chest. Or it can squeeze the heart sitting inside that space — that's tamponade.
Every injury in this lesson is one of those four things going wrong. So that's the order we'll go in: air, then blood, then frame, then heart.
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