Negative pressure pulmonary hemorrhage

Negative pressure pulmonary edema, a well-recognized phenomenon, is the for mation of pulmonary edema following an acute upper airway obstruction (UAO) , To our knowledge, diffuse alveolar hemorrhage, has not been reported prev iously as a complication of an UAO. We describe a case of negative pressure pulmonary hemorrhage, and we propose that its etiology is stress failure, the mechanical disruption of the alveolar-capillary membrane.