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1973
The 1st WHO meeting in Geneva 1973 on pulmonary hypertension proposed a classification based primarily on pathological grounds, namely "Plexogenic Pulmonary Arteriopathy", "Thrombotic Pulmonary Arteriopathy" and "Pulmonary Venous Occlusive Arteriopathy". Clinically the disorders often were classified as primary or secondary. Duringe the next decade it became clear, that the histopathologic features were not specific for the proposed disease entities.
 
1998
At the 2nd WHO symposium in Evian 1998, a diagnostic classification of various forms of pulmonary hypertension was proposed:

 

Pulmonary Arterial Hypertension, including Primary Pulmonary Hypertension (PPH, sporadic or familial) and PAH related to risk factors Pulmonary Venous Hypertension including left-sided heart disease, extrinsic compression of central pulmonary veins and pulmonary veno-occlusive disease Pulmonary Hypertension Associated with Disorders of the Respiratory System and/or Hypoxemia Pulmonary Hypertension due to Chronic Thrombotic and/or Embolic Disease Pulmonary Hypertension due to Disorders Directly Affecting the Pulmonary Vasculature

2003
The recent 3rd World Symposium on Pulmonary Hypertension in Venice, June 23rd-25th, 2003 has provided the opportunity to evaluate the impact and usefulness of the Evian classification, and to propose modifications.

see "New classification for pulmonary arterial hypertension"

see "Diagnostic classification"