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Poor survival among patients with untreated pulmonary arterial hypertension (PAH) means that timely and accurate diagnosis is of paramount importance. However, the nonspecific nature of PAH symptoms, which include breathlessness and fatigue, make PAH a considerable diagnostic challenge. As a result, many patients are passed among different physicians and are only correctly diagnosed at relatively advanced stages of disease, when they are already significantly compromised and are finding evendoi:10.1183/09059180.00010203 fatcat:zdoxkfcwm5fejeoypkw4znbgfe