What are the 5 groups of pulmonary hypertension (from WHO)
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Group 1: pulmonary arterial hypertension (idiopathic, heritable, connective tissue disease related etc) Group 2: pulmonary hypertension owing to left heart disease Group 3: pulmonary hypertension owing to lung disease and/or hypoxia Group 4: chronic thromboembolic pulmonary hypertension (CTEPH) Group 5: pulmonary hypertension with unclear multifactorial mechanisms
