What will heppens if pleural cavity is punctured?
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Usually what happens is the lung collapses. It relies on positive pressure to keep it inflated. This is called pneumothorax. When there is blood around the area (usually due to trauma) it's referred to as a hemothorax. Sometimes there can be a partially collapsed lung and then the air escapes into the surrounding tissue. When pressed this air will feel like small bubble wrap being popped this is referred to as crepitus. If the air leak in the surrounding tissues is not remedied it can become life-threatening by putting pressure on the major vessels and the heart. It can even lead to the trachea deviating to one side.
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