According to WHO classification there are 5 groups of PH, where Group I<unk>  arterial hypertension) is further subdivided into Group I classes. The most recent WHO classification system (with adaptations from the more recent ESC/ERS guidelines shown in italics) can be summarized as follows: WHO Group I –<unk>  arterial hypertension (PAH) * Idiopathic * Heritable (BMPR2, ALK1, SMAD9, caveolin 1, KCNK3 mutations) * Drug- and toxin-induced (e.g., methamphetamine, amphetamine, or cocaine use ) * Associated conditions:Connective tissue disease, HIV infection, Portal hypertension, Congenital heart diseases, Schistosomiasis WHO Group I –<unk>  veno-occlusive disease (PVOD),<unk>  capillary hemangiomatosis (PCH) * Idiopathic * Heritable (EIF2AK4 mutations) * Drugs, toxins and radiation-induced * Associated conditions:connective tissue disease, HIV infection WHO Group I" – Persistent<unk>  hypertension of the newborn WHO Group II –<unk>  hypertension secondary to left heart disease * Left ventricular systolic dysfunction * Left ventricular diastolic dysfunction * Valvular heart disease * Congenital/acquired left heart inflow/outflow tract obstruction and congenital cardiomyopathy * Congenital/acquired<unk>  venous stenosis WHO Group III –<unk>  hypertension due to lung disease, chronic hypoxia * Chronic obstructive<unk>  disease (COPD) * Interstitial lung disease * Mixed restrictive and obstructive pattern<unk>  diseases * Sleep-disordered breathing * Alveolar hypoventilation disorders * Chronic exposure to high altitude * Developmental abnormalities WHO Group IV – chronic arterial obstruction * Chronic thromboembolic<unk>  hypertension (CTEPH) * Other<unk>  artery obstructions * Angiosarcoma or other tumor within the blood vessels * Arteritis * Congenital<unk>  artery stenosis * Parasitic infection (hydatidosis) WHO Group V –<unk>  hypertension with unclear or multifactorial mechanisms * Hematologic diseases: chronic hemolytic anemia (including sickle cell disease) * Systemic diseases: sarcoidosis,<unk>  Langerhans cell histiocytosis: lymphangioleiomyomatosis, neurofibromatosis, vasculitis * Metabolic disorders: glycogen storage disease, Gaucher disease, thyroid diseases * Others:<unk>  tumoral thrombotic microangiopathy, fibrosing mediastinitis, chronic kidney failure, segmental<unk>  hypertension<unk>  hypertension restricted to one or more lobes of the lungs)
complications of Idiopathic pulmonary fibrosis
complications of Bronchiolitis
complications of Alpha-1 antitrypsin deficiency
complications of Melioidosis
medical cause of Bronchiolitis obliterans
symptom of Idiopathic pulmonary fibrosis
medical cause of Bronchiolitis
complications of Asbestosis