Subvisceral pleural air in neonates with respiratory distress

We reviewed our cases of persistent extrapulmonary air following chest tube placement and decided to test the hypothesis that this entity may represent collections of air beneath the visceral pleura. We describe ten patients who had this entity despite one or more chest tubes per pleural cavity, and described the creation of subvisceral pleural blebs in preterm lambs with respiratory distress requiring mechanical ventilation. We conclude that (1) subvisceral pleural air may occur in infants with respiratory distress and, thus, may be inaccessible to chest-tube drainage, and (2) centrifugal dissection of air, though poorly appreciated previously, may play an important role in the pathogenesis of extrapulmonary air.