4 A primary cardiac discharge diagnosis is recorded in almost half of the PAH-related hospitalizations, but primary cardiac hospitalizations show a decreasing trend from 2001 to 2014 falling from 52.9% to 41.4% of all hospitalizations. 5 Extra-cardiac reasons for hospitalization in patients with PAH are overall associated with greater inpatient mortality than a primary cardiac diagnosis (6.9% vs 5.3%).
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