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Etiology of DAH
| Immune | n=11 |
| Small vessel vasculitis | 8 |
| Microscopic polyangiitis | 7 |
| Granulomatosis with polyangiitis | 1 |
| Connective tissue disease | 3 |
| Systemic Lupus Erythematosus | 2 |
| Rheumatoid Arthritis | 1 |
| Nonimmune | n=13 |
| Heart disease | 6 |
| Mitral stenosis | 3 |
| Left ventricle dysfunction | 2 |
| Atrial myxoma | 1 |
| Toxic-induced | 3 |
| Amiodarone toxicity | 2 |
| Cannabis toxicity | 1 |
| Clotting disorder | 2 |
| S. aureus infection | 1 |
| Idiopathic | 1 |
