Pneumothorax refers to the presence of gas in the pleural space. Qualifiers include spontaneous, traumatic, diagnostic, and tension. Tension pneumothorax is the accumulation of intrapleural gas under pressure. In this situation, the ipsilateral lung will, if normal, collapse completely; however, a less than normally compliant lung may remain partially inflated. Radiographs and CT. – On chest radiographs, a visceral pleural edge is visible unless the pneumothorax is very small or the pleural edge is not tangential to the X-ray beam. Tension pneumothorax may be associated with considerable shift of the mediastinum and/or depression of the hemidiaphragm. Some shift can occur without tension because the pleural pressure in the presence of pneumothorax becomes atmospheric, while the pleural pressure in the contralateral hemithorax remains negative.
Posted on: Fri, 14 Nov 2014 14:13:14 +0000