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| Causes of |
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| Pulmonary Arterial Hypertension |
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| 4 |
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| 1. | Primary or
idiopathic |
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| 2. | Secondary to |
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| 1. | Lung disease – COPD, fibrosis |
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| 2. | Pulm. arterial dz – arteritis, |
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| multiple
emboli |
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| 3. | Chronic hypoxia – hi altitude |
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