Assertion: pneumothorax's chest tube | /r/CapableOf | become blocked by clot
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text: If, for example, the chest tube becomes blocked by a clot, the water-sealed bottle would stop bubbling, but the atmospheric vent in the pressure-regulating bottle would continue to bubble, reducing the negative pressure being transmitted to the chest tube to match the depth of the submerged tip of the atmospheric vent tube (or 12 cm H2O, in this case).