Pulmonary hypertension refers to a variety of conditions characterized by elevations in pulmonary arterial pressure. Major advances in the understanding of PH have led to the current classification in which PH diseases are grouped into five categories according to cause and therapeutic strategy, with each category subdivided to reflect diverse underlying etiologies and sites of injury. The five major categories of the Venice classification include PAH, pulmonary venous hypertension associated with left heart disease, PH associated with hypoxemia, PH due to chronic thrombotic and/or embolic disease, and PH due to miscellaneous causes. One notable change in the current nomenclature is that the term “idiopathic pulmonary arterial hypertension” (IPAH) has replaced “primary pulmonary hypertension.” The WHO functional classification standardizes the comparison of clinical severity among patients with PH. Experts have embraced both the clinical and functional classification systems. Future attempts at refining the classification of this constellation of diseases are likely to embrace new insights into the molecular mechanisms and genetics of PH.
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Hargett, C.W., Tapson, V.F. (2008). Classification of Pulmonary Hypertension. In: Hill, N.S., Farber, H.W. (eds) Pulmonary Hypertension. Contemporary Cardiology™. Humana Press. https://doi.org/10.1007/978-1-60327-075-5_2
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