HOUSTON, Nov. 5, 2007 (PRIME NEWSWIRE) -- Encysive Pharmaceuticals, Inc. (NasdaqGM:ENCY - News) today announced that open label observational data from Columbia University suggests that sitaxsentan (THELIN), a selective endothelin A receptor antagonist, may improve symptoms associated with Eisenmenger syndrome (ES). The analyses were presented today at the American Heart Association (AHA) Scientific Sessions 2007 meeting in Orlando.