Diffuse Alveolar Hemorrhage in Patients with Systemic Lupus Erythematosus: Data from the Spanish Society of Rheumathology Lupus Register (RELESSER)

Introduction: Diffuse alveolar hemorrhage (DAH) is a rare complication with high mortality in patients with systemic lupus erythematosus (SLE). Early diagnosis and treatment are essential to improve patient prognosis. To determine the characteristics of patients with DAH and their mortality in a Spanish cohort of patients with SLE. Methods: Patients from the RELESSER (Spanish Society of Rheumatology Lupus Register) who had had at least one confirmed episode of DAH were included. Epidemiological, clinical, and laboratory characteristics were analyzed. Results: 4024 patients were included in the RELESSER register, 37 (0.9