- A current diagnosis or Pulmonary Arterial Hypertension according to the Dana Point 2008 Meeting: WHO Diagnostic Group I, idiopathic or heritable (familial or sporadic) PAH, PAH associated with collagen vascular disease including systemic sclerosis, rheumatoid arthritis, mixed connective tissue diseases, and overlap syndrome. PAH following one year repair of congenital heart defect (ASD, VSD, or PDA), or PAH associated with diet therapies or other drugs