Disruption of lung parenchyma by airway gas (baro trauma) frequently occurs in the intensive care unit. Gas may move from the airspace into several abnormal loca tions as a result of dissection along anatomical fascial planes to potentially produce interstitial emphysema, subpleural cysts, pneumomediastinum, subcutaneous emphysema, pneumopericardium, pneumothorax, pneu moperitoneum, pneumoretroperitoneum, bronchopleu ral fistulas, and air-entry into blood vessels. Although usually of limited clinical consequence, this extra-alve olar air may produce clinically significant morbidity and mortality. Recognition of these potential complications of pulmonary disease and its therapy may assist the clini cian in correctly diagnosing, avoiding, and treating the manifestations of pulmonary barotrauma.
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