Question: who classification of pulmonary hypertension?
Answer: Group 1 - Pulmonary arterial hypertension (PAH) Group 2 - Pulmonary hypertension due to left-sided heart disease. Group 3 - Pulmonary hypertension due to lung diseases and/or hypoxia. Group 4 - Chronic thromboembolic pulmonary hypertension (CTEPH)