A revised clinical classification of PH was proposed by Simonneau et al. during the Third World Symposium on Pulmonary Arterial Hypertension, and HAPH was considered in item 3.5 as "Chronic exposure to high altitude" . For those interested in high altitude medicine, we propose a more detailed classification of HAPH with the corresponding clinical conditions, as follows:
High Altitude Pulmonary Hypertension.
1. Healthy highlanders living above 3000m
2. Chronic high altitude diseases
2.1. Chronic mountain sickness (CMS)
2.2. Adult high altitude heart disease (HAHD described in China)
2.3. High altitude cor pulmonale (HACP described in Kyrgyz)
3. Subacute mountain sickness (subacute HAHD)
3.1. Infantile subacute mountain sickness (or pediatric HAHD)
3.2. Adult subacute mountain sickness
4. High altitude pulmonary edema
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