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*Idiopathic PAH(unknown cause) | *Idiopathic PAH(unknown cause) | ||
*Familial PAH(genetic cause) | *Familial PAH(genetic cause) | ||
*PAH by underlying causes as, connective tissue diseases, congenital heart disease, portal hypertension, HIV infection, drugs, drugs, toxins, and other factors. | *PAH by underlying causes such as, connective tissue diseases, congenital heart disease, portal hypertension, HIV infection, drugs, drugs, toxins, and other factors. | ||
*PAH with significant venous and / or capillary involvement | *PAH with significant venous and/or capillary involvement | ||
*Persistent pulmonary hypertension of newborn | *Persistent pulmonary hypertension of newborn | ||
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*Chronic obstructive pulmonary disease(COPD) | *Chronic obstructive pulmonary disease(COPD) | ||
*Interstitial lung disease | *Interstitial lung disease | ||
*Sleep disorders, alveolar hypoventilation ; | *Sleep disorders, alveolar hypoventilation; | ||
chronic exposure to high altitude | chronic exposure to high altitude | ||
*Congenital malformations / developmental | *Congenital malformations/developmental | ||
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|Pulmonary hypertension due to chronic thrombotic and / or embolic processes | |Pulmonary hypertension due to chronic thrombotic and/or embolic processes | ||
| | | | ||
*Thromboembolic obstruction of proximal pulmonary arteries | *Thromboembolic obstruction of proximal pulmonary arteries | ||
*Thromboembolic obstruction of distal pulmonary arteries | *Thromboembolic obstruction of distal pulmonary arteries | ||
* | *Embolism of the lung (eg: tumor, parasites, foreign body, bone marrow) | ||
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|Pulmonary hypertension as a result of other diseases and disorders | |Pulmonary hypertension as a result of other diseases and disorders | ||
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*Sarcoidosis | *Sarcoidosis | ||
*Histiocytosis X | *Histiocytosis X | ||
* | *Lymphangioleiomyomatosis | ||
*Sickle Cells | *Sickle Cells | ||
*Compression of the pulmonary vessels from outside(eg by lymphadenopathy, tumor, fibrosing mediastinitis) | *Compression of the pulmonary vessels from outside(eg: by lymphadenopathy, tumor, fibrosing mediastinitis) | ||
* | *Storage disorders | ||
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