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In page Chest tube:

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Subcutaneous emphysema indicates backpressure created by undrained air, often caused by a clogged chest tube or insufficient negative pressure.[citation needed] If a person has subcutaneous emphysema, it is likely their chest tube is not draining and consideration should be given if it should be unclogged or another tube should be placed so that the air leaking from the lung can be adequately drained.