| http://www.w3.org/ns/prov#value | - Although PAH may be asymptomatic, particularly in its early stages, exertional dyspnea is the most frequent presenting symptom, and was present in 60% of patients in the National Institutes of Health (NIH) prospective cohort study of patients with PPH.8 Dyspnea is eventually present in virtually all patients as the disease progresses.
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