Severe respiratory failure due to diffuse alveolar hemorrhage: clinical characteristics and outcome of intensive care.

BACKGROUND: The aim of this study was to characterize patients and report outcome of diffuse alveolar hemorrhage (DAH) requiring intensive care unit support.

PATIENTS AND METHODS: Thirty-seven patients were identified. Clinical characteristics and outcome were determined by chart review.

RESULTS: Eighty-nine percent of patients presented with shortness of breath, 23% with cough, and 3% with hemoptysis. In 9% of patients, a diagnosis of DAH was suspected on admission. Diagnosis was confirmed by finding a progressively hemorrhagic bronchoalveolar lavage fluid in 89% and by a positive iron stain in 11% of patients. Vasculitis was causative in 19%, drug toxicity in 11%, thrombocytopenia in 27%, stem-cell transplantation in 5%, sepsis-associated lung injury in 22%, and unknown mechanisms in 16%. Thirty-two patients were mechanically ventilated, 4 received noninvasive ventilation, and 1 received supplemental oxygen therapy. Overall, 18 (49%) of 37 patients survived the intensive care unit stay. Survival was markedly different between patients with an immunologic/unknown etiology (82%) and patients with thrombocytopenia and/or sepsis (22%).

DISCUSSION: Diffuse alveolar hemorrhage should be considered in all patients with persistent pulmonary infiltrates. Both bronchoalveolar lavage fluid and iron stain are mandatory diagnostic means. Patients with an immunologic/idiopathic pathogenetic mechanism have a relatively good prognosis, whereas the outcome in individuals with DAH secondary to cancer therapy or sepsis is poor.