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Acute pulmonary triggers and chronic lung diseases. Acute pulmonary triggers were identified in 7% of patients. In the other patients, 12% had a past history of chronic lung diseases including chronic obstructive pulmonary disease and asthma. Patients without an acute pulmonary trigger or chronic lung disease were classified into the no lung disease group (81%). ARDS, acute respiratory distress syndrome; COPD, chronic obstructive pulmonary disease.
