| tension p. |
pneumothorax in which the pressure within the pleural space is greater than atmospheric pressure; this may occur when air enters under positive pressure, such as when caused by positive pressure ventilation, or when the tissues around the opening into the pleural cavity act as valves, allowing air to enter but not to escape. The resultant positive pressure in the cavity displaces the mediastinum to the opposite side, with consequent interference with respiration. Called also pressure p.
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